WO2010058830A1 - Method for controlling agricultural and horticultural plant disease - Google Patents

Abstract

Provided is a method for controlling an agricultural and horticultural plant disease which comprises treating seeds of the subject plant or a cultivation carrier for sowing the subject plant with a disease resistance inducer to thereby reduce the application frequency of an agricultural and horticultural germicide against a disease occurring from the sowing time to the peak or later growth stage.  A method for controlling an agricultural and horticultural plant disease characterized by comprising treating seeds of the subject plant, a cultivation carrier for sowing the seeds of the subject plant, soil for sowing the seeds of the subject plant or soil for transplanting plant seedlings having been raised in a cultivation carrier with a disease resistance inducer and then applying an agricultural and horticultural germicide at least once after BBCH growth stage 40.

Description

Disease control methods for agricultural and horticultural plants

The present invention relates to a disease control method for agricultural and horticultural plants using a disease resistance inducer. More specifically, the present invention relates to a method for controlling diseases of agricultural and horticultural plants that are treated with seeds of plants to be controlled with the disease resistance inducer, cultivation carriers for seeding the target plants, or soil for seeding the seeds of the target plants.

Agricultural and horticultural crop production is still severely damaged by diseases, etc., and there are reports of fungal drug-resistant strains against existing agents due to long-term use, and requests for the development of agricultural and horticultural plant disease control agents with new activities Is expensive. In recent years, so-called disease resistance inducers (plant activators) have attracted attention as next-generation agricultural chemicals. Although this disease resistance inducer does not show a direct bactericidal effect on the disease, the disease is controlled by inducing resistance to the disease inherent to the plant itself. In addition, the effect is maintained for a relatively long period of time, and since there is no pathogen-specificity, it exhibits a control effect against a wide range of diseases, and drug-resistant strains rarely appear (for example, non-patent literature) 1).

On the other hand, in recent years, due to the aging of farmers, the development of various labor-saving usage methods and the reduction of the amount of drugs to be used are required for the purpose of global environmental conservation. Usage methods suitable for these and control of plant diseases for agriculture and horticulture There is a strong demand for the creation of drugs. As one of conventional methods for controlling diseases of agricultural and horticultural plants, for example, there is a method of applying an agricultural and horticultural fungicide to the seed of the target plant, a cultivation carrier for seeding the target plant, or a soil for seeding the seed of the target plant. Are known. In this method of use, since the drug is present only in the seed of the target plant, the cultivation carrier for seeding the target plant, or the soil for seeding the seed of the target plant, the amount of drug used is reduced and the burden on the global environment is reduced. By reducing the contact between the worker and the medicine, the safety of the worker is increased, and the labor is saved.

Accurately grasping the growth of crops in agricultural work related to crop cultivation is extremely important for grasping the appropriate time for each work and preventing weather disasters. In particular, it is not preferable for herbicides and fungicides to be removed from the appropriate treatment period indicated in the usage standards in terms of medicinal efficacy and phytotoxicity. However, it is generally difficult to understand because the expression of the growing season varies depending on the scene and region even for the same crop. For this reason, the BBCH method, which is a notation method that makes it possible for farmers to easily understand the growth stage of crops by digitizing or symbolizing the growth stage of plants, is becoming popular.
In this BBCH method, the growth stage of all plants is represented by a two-digit number, and the temporary growth stage of the plant is 0 to 9 (0: germination stage, 1: leaf development) in the second digit (number on the left side). Period 2: tillering period 3: stem growth period 4: harvesting period 5: heading or flower bud formation period 6: flowering period 7: lactation period 8: ripening period 9 : The dead stage)), and the details of the secondary growth stage of the plant are classified into 0 to 9 stages in the first digit (number on the right side). As a result, the growth stage of the plant can be expressed by a decimal “two-digit code” of 00 to 99. For example, in cereals, BBCH 00-29 refers to the period from the dry seed to the end of tillering, BBCH 31-39 is from the start of stem and leaf elongation to the end of leaf development, and BBCH 41 to 59 is heading from the beginning of leaf extension. The end period, BBCH 60 to 89, 99 represents the period when the fruit starts to fall from the first flowering period, and the dormant period (see, for example, Non-Patent Documents 2 and 3).

According to the BBCH notation in the previous term, the method for controlling diseases that occur in cereals such as wheat and barley is as follows: “Ergosterol biosynthesis inhibitors such as triazimenol, vitertanol or triticonazole, dithiocarbamate agents such as thiuram, etc. Seed infectious diseases (bare black ear disease, Namagusa black ear disease, ergot disease, etc.) and soil infectious diseases (withering disease, strain rot, eyeprint) that develop during the growth stage of BBCH00-29 Diseases such as powdery mildew, rust, or septoria that develops during the growth stage of BBCH 31-99, azole fungicides, morpholine fungicides, strobilurin fungicides etc. that have a controlling effect. It is controlled systematically by spraying the foliage 2-3 times. " Among these, the spraying treatment of the plant disease control agent for agricultural and horticultural use normally performed on the BBCH 31 to 39 in the growth stage is T1 treatment, the spraying treatment of the plant disease control agent for agricultural and horticultural treatment performed on the BBCH 40 to 59 is T2 treatment, BBCH60 or later The spraying treatment of the plant disease control agent for agricultural and horticultural use performed in the above is called T3 treatment (for example, see Non-Patent Document 4).

On the other hand, thiazinyl (generic name, for example, refer to Non-Patent Document 5), acibenzoral-S-methyl (generic name), probenazole (generic name), NCI, INA, BIT and isothianyl (generic name) are disease resistance inducers. (See, for example, Non-Patent Document 6 or 7). Its structural formula is shown below. Also known is a method of treating a specific 1,2,3-thiadiazole derivative as a plant disease control agent for agriculture and horticulture with a seed for the plant to be controlled or a cultivation carrier for seeding the plant (for example, see Patent Document 1). .)

JP 2007-99749 A

As described above, a method of applying an agricultural and horticultural fungicide to the seed of a target plant or a cultivation carrier for seeding the target plant has been reported, but in the prior art, the sterilization spectrum, treatment dose, residual effect, target plant There has been a problem that sufficient performance cannot be exhibited in terms of safety and the like. In addition, since the method is intended to control diseases that develop during the period from the seed of the target plant to the early stage of growth (BBCH00 to 29), it is possible to prevent diseases that develop from the growing season to the late stage (after BBCH31). For the control, separately, a plurality of times of control (T1 treatment, T2 treatment and T3 treatment) by spraying agricultural and horticultural fungicides or the like were indispensable. Therefore, a disease control method for agricultural and horticultural plants having a long-term control effect against diseases that occur during the period from sowing to the growing season or later, that is, multiple times by spraying the agricultural and horticultural fungicides, etc. Therefore, there has been a demand for a method for controlling diseases of agricultural and horticultural plants that can reduce the control of the plant.

As a result of intensive studies to address the above-mentioned problems, the inventors have applied a disease resistance inducer to the seed of the target plant, a cultivation carrier for seeding the target plant, or a soil for seeding the seed of the target plant. The disease resistance inducer not only exhibits excellent control effects against various plant diseases and excellent safety for target plants, but also has an extremely long-term control effect that is not expected in the prior art. The present invention has been completed.

That is, the present invention
[1] Seeds of target plant, cultivation carrier for sowing seed of target plant, soil for sowing seed of target plant, or soil for transplanting target plant grown on cultivation carrier with disease resistance inducer A method for controlling diseases of agricultural and horticultural plants, characterized in that the agricultural and horticultural fungicides are then sprayed at least once in the period after BBCH40,
[2] The method for controlling diseases of agricultural and horticultural plants according to [1], wherein the period after BBCH 40 is BBCH 40 to 59;
[3] The method for controlling diseases of agricultural and horticultural plants according to [1], wherein the time after BBCH40 is after BBCH60,
[4] The method for controlling diseases of agricultural and horticultural plants according to any one of [1] to [3], wherein the target plants are cereals or crops for processing;
[5] The method for controlling diseases of agricultural and horticultural plants according to any one of [1] to [3], wherein the target plant is wheat or barley;
[6] The active ingredient of the disease resistance inducer is
Formula (I):

{Wherein R ¹ , R ² , R ³ , R ⁴ and R ⁵ may be the same or different and each represents a hydrogen atom; a halogen atom or a (C ₁ -C ₃ ) alkyl group.
R ⁶ is a hydrogen atom; (C ₁ -C ₈ ) alkyl group; (C ₃ -C ₆ ) cycloalkyl group; phenyl (C ₁ -C ₆ ) alkyl group; halogen atom, cyano group, (C ₁ -C ₆ ) Alkyl group, halo (C ₁ -C ₆ ) alkyl group, (C ₃ -C ₆ ) cycloalkyl group, halo (C ₃ -C ₆ ) cycloalkyl group, (C ₁ -C ₆ ) alkoxy group, halo ( A substituted phenyl having one or more substituents which may be the same or different, selected from the group consisting of a C ₁ -C ₆ ) alkoxy group, a carboxyl group and a (C ₁ -C ₆ ) alkoxycarbonyl group (C _1- C ₆ ) alkyl group; phenyl group; halogen atom, cyano group, (C ₁ -C ₆ ) alkyl group, halo (C ₁ -C ₆ ) alkyl group, (C ₃ -C ₆ ) cycloalkyl group, halo (C ₃ -C ) Cycloalkyl _{group, (C} 1 -C ₆₎ alkoxy groups, halo _(C 1 -C ₆₎ alkoxy groups, 1 or the same or is selected from the group consisting of carboxyl group and _(C 1 -C ₆₎ alkoxycarbonyl group A substituted phenyl group having two or more substituents which may be different is shown.
Y represents an oxygen atom or —N (R ⁷ ) — (wherein R ⁷ represents a hydrogen atom, a (C ₁ -C ₆ ) alkyl group, or a (C ₃ -C ₆ ) cycloalkyl group).
W represents an oxygen atom or a sulfur atom. }
The method for controlling diseases of agricultural and horticultural plants according to any one of [1] to [5], which is a 1,2,3-thiadiazole derivative represented by the formula:
[7] The agricultural and horticultural use according to any one of [1] to [6], wherein the active ingredient of the disease resistance inducer is thiazinyl, acibenzoral-S-methyl, probenazole, NCI, INA, BIT, and isothianyl. Plant disease control methods,
[8] The agriculture according to any one of [1] to [7], wherein the effective amount of the active ingredient of the disease resistance inducer is 0.0001 to 1 part by weight per 100 parts by weight of the seed of the target plant. Disease control method for horticultural plants, and
[9] The method for controlling agricultural and horticultural plants according to [1], wherein the disease resistance inducer is a drug that imparts resistance to plant diseases to plants.
About.

According to the disease control method for agricultural and horticultural plants of the present invention, since the resistance to plant diseases is enhanced by the disease resistance inducer, conventionally, in each growth stage that has been essential in the systematic control method. It is possible to reduce the number of times of spraying the agricultural and horticultural fungicides. In particular, the method for controlling diseases of agricultural and horticultural plants according to the present invention includes powdery mildew, rust, and septoria that develop during the growth period (BBCH 31 to 59) from the emergence stage to the growing season to the late stage after sowing. It exerts a disease control effect against diseases caused by. As a result, the control method can omit the spraying process performed before the BBCH 40 in each growth stage that is normally performed, improves the working environment of agricultural workers, and is based on the foliage spraying process. It is possible to prevent the scattering of agricultural chemicals and reduce the total amount of agricultural chemicals used in the system control method, and consequently reduce the environmental load. This is an excellent performance compared to the prior art, and not only shows excellent safety for the target plant and excellent control effect against plant diseases, but also has a long-lasting effect, so that The present invention provides a method for controlling diseases of horticultural plants.

FIG. 1 illustrates the BBCH method.

The disease resistance inducer defined in the present invention is a control reaction similar to the immune response of animals, and does not show a direct bactericidal effect against plant pathogens, but is a disease possessed by the plant itself when it is infected with a pathogen. It refers to a composition comprising as an active ingredient a compound that controls disease by inducing resistance.
As an active ingredient of a disease resistance inducer suitably used in the present invention, 1,2,3-thiadiazole derivatives represented by the following general formula (I) or salts thereof, thiazinyl, acibenzoral-S-methyl, probenazole, NCI, INA, BIT, isotianil, etc. are mentioned.

In the definition of the general formula (I), the “halogen atom” refers to a chlorine atom, a bromine atom, an iodine atom or a fluorine atom. “(C ₁ -C ₆ ) alkyl group” means, for example, methyl group, ethyl group, normal propyl group, isopropyl group, normal butyl group, isobutyl group, secondary butyl group, tertiary butyl group, normal pentyl group, neopentyl group And a linear or branched alkyl group having 1 to 6 carbon atoms such as a normal hexyl group. The “halo (C ₁ -C ₆ ) alkyl group” refers to a linear or branched alkyl group having 1 to 6 carbon atoms substituted with one or more halogen atoms which may be the same or different, For example, trifluoromethyl group, difluorotyl group, perfluoroethyl group, perfluoroisopropyl group, chloromethyl group, bromomethyl group, 1-bromoethyl group, 2,3-dibromopropyl group and the like are shown.

The “(C ₃ -C ₆ ) cycloalkyl group” means, for example, 3 to 6 carbon atoms such as cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, 2-methylcyclopropyl group, 2-methylcyclopentyl group, etc. Represents an alicyclic alkyl group. “(C ₁ -C ₆ ) alkoxy group” means, for example, methoxy group, ethoxy group, normal propoxy group, isopropoxy group, normal butoxy group, secondary butoxy group, tertiary butoxy group, normal pentyloxy group, isopentyloxy group A straight-chain or branched alkoxy group having 1 to 6 carbon atoms such as a group, a neopentyloxy group, and a normal hexyloxy group;

The “halo (C ₁ -C ₆ ) alkoxy group” refers to a linear or branched alkoxy group having 1 to 6 carbon atoms substituted with one or more halogen atoms which may be the same or different, Examples thereof include a difluoromethoxy group, a trifluoromethoxy group, a 2,2,2-trifluoroethoxy group, and the like. “(C ₁ -C ₆ ) alkoxycarbonyl group” means, for example, linear or branched such as methoxycarbonyl group, ethoxycarbonyl group, normal propoxycarbonyl group, isopropoxycarbonyl group, normal butoxycarbonyl group, tertiary butoxycarbonyl group, etc. A chain-like alkoxycarbonyl group having 1 to 6 carbon atoms is shown.

The 1,2,3-thiadiazole derivative represented by the general formula (I) may contain one or more asymmetric centers in the structural formula, and two or more optical isomers and diastereomers However, the present invention includes all the optical isomers and the mixtures in which they are contained in an arbitrary ratio. These derivatives can be produced by the method described in Japanese Patent Application Laid-Open No. 2007-99749.

A preferred embodiment of the present invention will be described. R ¹ , R ² , R ³ , R ⁴ and R ⁵ are preferably a hydrogen atom or a (C ₁ -C ₃ ) alkyl group, preferably a hydrogen atom. R ⁶ is preferably a (substituted phenyl (C ₁ -C ₆ ) alkyl group or a substituted phenyl group, preferably a 4-chlorobenzyl group, a 2,4-dimethoxyphenyl group, more preferably a 2,4-dimethoxyphenyl group. Y is preferably an oxygen atom or —NH—, and preferably —NH—, and W is preferably an oxygen atom or a sulfur atom, preferably an oxygen atom.

Of the disease resistance inducers used in the disease control method of the present invention, those containing thiazinyl, acibenzol-S-methyl, probenazole and BIT as active ingredients are commercially available as products. NCI (J. Pesticide Sci. 15, 413-417 (1990)), INA (C.A. 16877e (1956)), and isotianil (Japanese translations of PCT publication No. 2005-530847) should each be manufactured according to the method described in the literature. Can do.

Specific examples of the 1,2,3-thiadiazole derivatives represented by the general formula (I) are listed in Table 1 below, but are not limited thereto. In Table 1, “Me” represents a methyl group, “Et” represents an ethyl group, “Ph” represents a phenyl group, “Bu” represents a butyl group, “n-Pr” represents a normal propyl group, “I-Pr” is an isopropyl group, “n-Bu” is a normal butyl group, “i-Bu” is an isobutyl group, “s-Bu” is a secondary butyl group, and “t-Bu” is tertiary. Represents a butyl group. “N _D (° C.)” represents the refractive index of the compound.

Among the 1,2,3-thiadiazole derivatives exemplified in Table 1, ¹ H-NMR data of some compounds are shown in Table 2. The compound numbers in Table 2 indicate the numbers described in Table 1 above.

The active ingredient of the disease resistance inducer used in the method of use of the present invention is not particularly limited as long as it has an effect over a long period of time, and the active ingredient is 1,2,3-thiadiazole derivative or a salt thereof, thiazinyl, probenazole, isothianyl , Acibenzoral-S-methyl, NCI, INA or BIT, preferably 1,2,3-thiadiazole derivatives or salts thereof, thiazinyl, probenazole, isothianyl, or acibenzoral-S-methyl, particularly preferably 1 2,3-thiadiazole derivatives or salts thereof.

The plant diseases to which the disease control method for agricultural and horticultural plants of the present invention is applied are not limited to these, but the following plant diseases can be exemplified.
Plant diseases are broadly classified into filamentous fungal diseases, bacterial diseases, and viral diseases. Examples of fungal diseases include, for example, diseases of the genus Botrytis, diseases of the genus Helmintosporium, diseases of the genus Fusarium, diseases of the genus Septoria, diseases of the genus Sarcospora, Diseases of the genus (Pseudocercosporella), diseases of the genus Rhynchosporium, diseases of the genus Pyricularia, diseases of the genus Alternaria; diseases of the genus Hemilelia, Diseases of the genus Ustilago, diseases of the genus Typhula, Pucchinia Diseases of the genus Puccinia, basidiomycetous diseases such as the disease of the genus Phakopsora; for example, diseases of the genus Venturia; Diseases of the genus (Erysiphe), diseases of the genus Microdocium, diseases of the genus Sclerotinia, diseases of the genus Gaeumanomyces, diseases of the genus Monilinia, diseases of the genus Unsinula For example, Ascochita disease, Phoma disease, Pysiu ) Genus disease, Korutishiumu (Corticium) genus disease, Pyrenophora (Pyrenophora) spp diseases include diseases caused by other fungi such as Mikosufaera genus (Mycosphaerella). Examples of the bacterial diseases include diseases caused by bacteria such as Pseudomonas genus diseases, Xanthomonas genus diseases, and Erwinia genus diseases. Examples of virus diseases include diseases caused by viruses such as tobacco mosaic virus.

As individual plant diseases, for example, rice blast (Pyricularia oryzae), rice sheath blight (Rhizoctonia solani), rice sesame leaf blight (Cochiobulus miyabeanusus), rice seedling wilt (Rhizominuspisumisus) , Fusarium roseum, Mucor sp., Poma sp., Tricoderma sp.), Rice idiot seedlings (Gibberella fujikuroi), barley and wheat etc. powdery diseases (Blumeria gramin i), cucumbers, etc. Powdery mildew such as eggplant (E Ysiphe cichoracoarum), other plant powdery mildew, barley and wheat and other eye spot diseases (Pseudocercosporella herpotrichoides), wheat and other scab (Urocystis tritici), barley and wheat worms, and so on. Fusarium graminearum, Fusarium avenaceum, Fusarium cummorumum, Fusarium cummorumumum, Fusarium cumumumumumumumumum, Fusarium umbarumumumumumum, Fusarium umbarumumumumumumumum, Fusarium umbarumumumumumumum, Fusarium umbarumumumumumumumum, Fusariumumumumumumumumumu Rust (Puccinia recondita, Puccinia striformis, Puccinia graminis), soybean rust (Phakopsora pachyrhizi), other plant rust, barley and wheat, etc. , Crown rust of other plants, gray mold disease such as cucumber or strawberry (Botrytis cinerea), mycorrhizal diseases such as tomato and cabbage (Sclerotinia sclerotiorum), plagues such as potato and tomato (Phytophthora infestans), other plants Plague, cucumber downy mildew (Pseudoperonospora cu ensis), grape downy mildew (Plasmopara viticola), various plant downy mildews, corn sesame leaf blight (Cochliobolus heterotrophus), corn Grey Leaf Spot disease (Cercospora zeeae-maydis) and other plant diseases Is mentioned.

In addition, apple black spot (Venturia inaequalis); apple spotted leaf (Alternaria mary), pear black spot (Alternaria kikuchiana); citrus black spot (Diaporthe citri); Cercospora beticola, peanut brown spot (Cercospora arachidicola), odorum; barley net spot (Pyrenophora teres); Wheat lintel scab Tilletia caries); Shiba leaf rot (Rhizoctonia solani); Shiva dollar spot disease (Sclerotinia homoeocarpa); Diseases caused by the genus Psuedomonas such as Pseudomonas glumae; for example, cabbage black rot (Xanthomonas campestris), rice leaf blight (Xanthomonas oryzae), soft rot of the genus Xanthomonas It has a remarkable control effect against bacterial diseases caused by Erwinia genus such as rwinia carotovora, for example viral diseases such as tobacco mosaic disease (Tobacco mosaic virus), especially powdery mildew (Blumeria graminis) occurring in barley and wheat, etc. , Eyespot disease (Pseudocercosporella herpotrichoides), snow rot (Microdochium nivalis, Phythium iwayumumumiumumium, Typula isicarinum, Tyflaisumuminbain, Syphaimusum, Syphaimusum, Syphaimusum, Syphaimusum, Syphaimusum, Syphaimusum, Syphaimusum, Syphaimusum, Syphaimusum, Syphaimusum, Syphaimusum, Syphaimusum, Syphaimusum, Syphaimusum, Syphaimusum. Moromi, Microdocium nivalis), Rust (Puccinia recondita, Puccinia strifomis, Puccinia graminis), Bacterial leaf wilt (Gaeumnomyces graminis), Wheat cris It is effective against blight (Septoria nodorum), Tan's Spot disease of wheat (Drechsure tritici-repentis), and the like.

The agricultural and horticultural plants to which the disease control method for agricultural and horticultural plants of the present invention can be applied are not particularly limited, and examples thereof include the following agricultural and horticultural plants.
Cereals (eg, rice, barley, wheat, rye, oats, corn, coconut, etc.), beans (eg, soybeans, red beans, broad beans, peas, peanuts, etc.), fruit trees or fruits (eg, apples, citrus fruits, Pears, grapes, peaches, plums, cherry peaches, walnuts, almonds, bananas, strawberries, etc.), vegetables (e.g. cabbage, tomatoes, eggplant, spinach, broccoli, lettuce, onion, leek, peppers, etc.), root vegetables (e.g., Carrots, potatoes, sweet potatoes, radishes, lotus roots, turnips, etc.), crops for processing (eg cotton, hemp, mulberry, honey beet, rapeseed, beet, hops, sugar cane, sugar beet, olives, gum, coffee, tobacco, tea, etc.) Moss (eg, pumpkin, cucumber, watermelon, melon, etc.), pasture (eg, orchard grass, sorghum, timothy, clover, apricot Farfa, etc.), turf (eg, Korean turf, bentgrass, etc.), fragrance crops (eg, lavender, rosemary, thyme, parsley, pepper, ginger, etc.), flower (eg chrysanthemum, rose, orchid, etc.) ), But is preferably applied to cereals, more preferably barley and wheat.

The disease resistance inducer used in the method for controlling diseases of agricultural and horticultural plants according to the present invention is an occurrence of the disease in an amount effective for controlling plant diseases as it is, or appropriately diluted with water or suspended. The seeds of the target plant, for which seeding is expected, the cultivation carrier or the soil for sowing may be treated, for example, rice nursery box application, seed dressing application method, seed disinfection method, planting hole treatment, plant source treatment, etc. Application methods such as crop treatment and soil mixing can be suitably used. In addition, for diseases that occur in field crops such as fruit trees, cereals, and vegetables, seed treatment such as dressing and soaking, soaking treatment of seedling roots, cropping during sowing, cultivation containers and planting holes for seedlings, stocks A method of irrigating after the irrigation to the original seedling carrier, etc., surface spraying, mixing treatment, etc., and allowing it to be absorbed by the plant can be suitably used. Moreover, you may process the hydroponic liquid in hydroponics. Preferably, it is applied to the seeds of the target plant, and is treated by an application method such as seed dressing or seed disinfection. A treatment method as a so-called seed treatment agent is particularly suitable.

As a treatment method as a seed treatment agent, for example, a method of immersing seeds in a liquid state by diluting or undiluting a liquid or solid disease resistance inducer, mixing with the seed, powder There are a method of attaching to the surface of the seed by clothing treatment, a method of mixing with a highly adhesive carrier such as resin or polymer, a method of coating the seed in a single layer or a multilayer, a method of spraying around the seed simultaneously with planting, etc. Can be mentioned.
In this specification, “seed” includes not only seeds covered with seed coats formed by seed plants but also plants for vegetative propagation such as bulbs, tubers, seeds, bulbs, or stems for cutting cultivation. It is.
The “soil” or “cultivation carrier” in the case of carrying out the method for controlling diseases of agricultural and horticultural plants of the present invention refers to a support for cultivating plants, and the material is not particularly limited. It can be any material that can grow, and includes, for example, so-called various types of soil, seedling mats, water, etc., sand, vermiculite, cotton, paper, diatomaceous earth, agar, gel material, polymer material, rock wool, glass wool , Wood chips, bark, pumice and the like.

Examples of application methods to the soil include, for example, a method in which a liquid or solid preparation is diluted or not diluted with water and applied to the vicinity of a plant installation place or a nursery bed for raising seedlings, etc. The method of spraying in the vicinity or nursery, the method of spraying powder, wettable powder, wettable granule powder, granule etc. before sowing or transplanting and mixing with the whole soil, the planting hole before sowing or before planting the plant, Examples include a method of spraying powder, wettable powder, wettable powder, granule, etc. on the strip.
As a method for applying paddy rice to a seedling box, the dosage form may differ depending on the application time, such as application at seeding, application at greening period, application at transplantation, etc., for example, agents such as powder, granule wettable powder, granule Apply with a mold. It can also be applied by mixing with soil, and it can be mixed with soil and powder, granulated wettable powder or granules, for example, mixed with ground soil, mixed with soil covering, mixed with the entire soil. Simply, the soil and various preparations may be applied alternately in layers. The time of application at the time of sowing may be before sowing, at the same time, after sowing, or after covering.

In field crops such as wheat, treatment from a seed or a cultivating carrier in the vicinity of the plant body is preferable from the sowing to the seedling raising period. In plants that are sown directly in a field, in addition to direct treatment on seeds, treatment on a cultivation carrier in the vicinity of the plant being cultivated is suitable. It is possible to perform spraying treatment using a granule or irrigation treatment in a liquid of a drug diluted or not diluted in water.
As the seeding of the cultivated plant to be transplanted and the treatment at the seedling raising stage, in addition to the direct treatment to the seed, the irrigation treatment of the liquid drug or the granule spraying treatment to the nursery seedling bed is preferable. Moreover, it is also a preferable aspect that a granule is processed into a planting hole at the time of planting or is mixed with a cultivation carrier in the vicinity of the transplantation site.
The active ingredient of the disease resistance inducer used in the method for controlling diseases of agricultural and horticultural plants of the present invention is generally used in a form convenient for use according to conventional methods on agricultural chemical formulations. . That is, it is an active ingredient of a disease resistance inducer, and the 1,2,3-thiadiazole derivative represented by the general formula (I) or a salt thereof is supported by a suitable inert carrier or as needed. It is mixed with an agent in an appropriate ratio and dissolved, separated, suspended, mixed, impregnated, adsorbed or adhered, and an appropriate dosage form such as a suspension, emulsion, liquid, wettable powder, granule, powder, In the case of tablets, seed coatings, etc., they may be used by being formulated into suspensions or liquids suitable for treatment such as spraying, coating, and immersion.

The inert carrier that can be used in the disease resistance inducer used in the method for controlling diseases of agricultural and horticultural plants of the present invention may be either solid or liquid. Examples of materials that can be used as a solid carrier include soybeans. Powder, cereal powder, wood powder, bark powder, saw powder, tobacco stem powder, walnut shell powder, bran, fiber powder, residues after extraction of plant extracts, synthetic polymers such as ground synthetic resin, clays (eg kaolin, Bentonite, acid clay, etc.), talc (eg, talc, pyrophyllite, etc.), silica (eg, diatomaceous earth, silica sand, mica, white carbon (hydrous finely divided silicon, hydrous silicic acid). Some are included as ingredients.)}, Activated carbon, sulfur powder, pumice, calcined diatomaceous earth, ground brick, fly ash, sand, calcium carbonate, calcium phosphate Inorganic mineral powders, ammonium sulfate, ammonium phosphate, ammonium nitrate, urea, fertilizer salts depreciation etc., can be exemplified compost or the like, which are used alone or in the form of a mixture of two or more.

The material that can be used as a liquid carrier is selected from those having solvent ability itself and those capable of dispersing the active ingredient compound with the aid of an auxiliary agent without having solvent ability. The following carriers can be exemplified, but these are used alone or in the form of a mixture of two or more thereof, for example, water, alcohols (for example, methanol, ethanol, isopropanol, butanol, ethylene glycol, etc.), ketones (for example, acetone) , Methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone, etc.), ethers (eg, ethyl ether, dioxane, cellosolve, dipropyl ether, tetrahydrofuran, etc.), aliphatic hydrocarbons (eg, kerosene, mineral oil, etc.), aromatic hydrocarbons (E.g. benzene, torr , Xylene, solvent naphtha, alkylnaphthalene, etc.), halogenated hydrocarbons (eg, dichloroethane, chloroform, carbon tetrachloride, chlorinated benzene, etc.), esters (eg, ethyl acetate, diisopropylpropyl phthalate, dibutyl phthalate) , Dioctyl phthalate, etc.), amides (eg, dimethylformamide, diethylformamide, dimethylacetamide, etc.), nitriles (eg, acetonitrile, etc.), dimethyl sulfoxides, and the like.

As other adjuvants, typical adjuvants exemplified below can be mentioned, and these adjuvants are used depending on the purpose, and singly, in some cases, two or more kinds of adjuvants are used together. In some cases it is possible to use no adjuvants at all. Surfactants are used for the purpose of emulsifying, dispersing, solubilizing and / or wetting of the active ingredient compound, such as polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene higher fatty acid ester, polyoxyethylene. Illustrative surfactants such as resin acid ester, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monooleate, alkyl aryl sulfonate, naphthalene sulfonic acid condensate, lignin sulfonate, higher alcohol sulfate be able to. In addition, for the purpose of stabilizing the dispersion of the active ingredient compound, adhesion and / or binding, the following auxiliary agents can be used, such as casein, gelatin, starch, methylcellulose, carboxymethylcellulose, gum arabic, polyvinyl Adjuvants such as alcohol, pine oil, coconut oil, bentonite, and lignin sulfonate can also be used.

When the disease resistance inducer used in the method for controlling diseases of agricultural and horticultural plants of the present invention is a solid product, the following adjuvants may be used for improving the fluidity of the solid product, such as wax, stearin Adjuvants such as acid salts and alkyl phosphates can be used. As a peptizer for the suspension product, for example, auxiliary agents such as naphthalenesulfonic acid condensate and condensed phosphate can be used. As the antifoaming agent, for example, an auxiliary agent such as silicone oil can be used.
The disease resistance inducer used in the method for controlling diseases of agricultural and horticultural plants according to the present invention may further include pests to be controlled, other agricultural and horticultural purposes for the purpose of expanding the appropriate period of control, or reducing the dosage and synergistic effects. It can be mixed with insecticides, acaricides, nematicides, fungicides, biological pesticides, etc., and mixed with herbicides, plant growth regulators, fertilizers, etc. It is also possible to use it.

The disease resistance inducer used in the method for controlling diseases of agricultural and horticultural plants of the present invention can be mixed or used in combination with other components as necessary. For example, animals such as birds can be used for seed treatment. To avoid ingestion (including accidental ingestion), repellents and other ingredients can be included. Repellents include, for example, odorous compounds such as naphthalene compounds, contact inhibitors such as castor oil, pine resin, polybutane, diphenylamine pentachlorophenol, quinone, zinc oxide, aromatic solvents, N- (trichloromethylthio) -4-cyclohexene- Bitter substances such as 1,2-carboximide, anthraquinone, copper oxalate, terpene oil, paradichlorobenzene, aryl isothiocyanate, amyl acetate, anethole, citrus oil, cresols, geranium oil or lavender oil, Menthol, methyl salicylate, nicotine, pentanethiol, pyridines, tributyltin chloride, thiram, ziram, carbamate insecticides (such as methiocarb), guazatine, chlorinated cyclodiene insecticides (such as endrin), organophosphorus insecticides (such as endrin) Example If it is possible to illustrate the fenthion, etc.) and the like. As other components, toxic substances or growth inhibitory substances (fertility agents) include, for example, 3-chloro-4-toluidine hydrochloride, strychnine, 20,25-diazacholesterol hydrochloride (code name: SC-12937), etc. Can be illustrated.

The content of the active ingredient of the disease resistance inducer used in the method for controlling diseases of agricultural and horticultural plants of the present invention ranges from about 0.01 to about 80 parts by mass per 100 parts by mass of the disease resistance inducer. For example, when various preparations used in the field of agriculture and horticulture (emulsion, powder, wettable powder, granule, wettable powder, flowable powder, etc.) are used, about 0.01 to About 50 parts by weight is suitable, preferably about 1 to about 50 parts by weight. The dosage of the disease resistance inducer varies depending on the compounding ratio of the active ingredient compound, weather conditions, formulation form, application timing, application method, application location, disease to be controlled, target crop, etc. The active ingredient compound may be appropriately selected from the range of about 0.1 g to about 1000 g per are, and preferably in the range of about 1 to about 100 g. The seed treatment agent may be appropriately selected from the range of about 0.1 to about 1000 g as an active ingredient compound per 100 kg of dry seed weight, and preferably about 1 to about 300 g.

The disease resistance inducer used in the method for controlling diseases of agricultural and horticultural plants of the present invention is not limited to single use, but various compounds, for example, plant disease control agents for agricultural and horticultural diseases having the bactericidal activity or insecticidal activity shown below. It can also be used in combination with it, and can also be used in combination.
Examples of agricultural and horticultural plant disease control agents showing bactericidal activity include, for example, melanin synthesis inhibitors, strobilurin fungicides, ergosterol biosynthesis inhibitors, acid amide fungicides, succinic acid synthase inhibitor fungicides, acylalanine Examples include various bactericides such as a system bactericidal agent, a dicarboximide bactericidal agent, a benzimidazole bactericidal agent, a dithiocarbamate bactericidal agent, a pyrrole bactericidal agent, a metal-containing bactericidal agent or an antibiotic. An ergosterol biosynthesis inhibitor such as fluquinconazole or a pyrrole fungicide such as fludioxonil is preferable.
Examples of agricultural and horticultural plant disease control agents showing insecticidal activity include neonicotinoid insecticides, benzoylurea insecticides, dibenzoylhydrazine insecticides, pyrazoline insecticides, phenylpyrazole insecticides, respiratory inhibitor inhibitors And various insecticides such as a macrolide insecticide. Neonicotinoid insecticides such as imidacloprid and thiamethoxam are preferred.

The disease resistance inducer and the agricultural or horticultural plant disease control agent having bactericidal activity or insecticidal activity, respectively, or a diluted solution thereof may be mixed and applied at the time of use at the time of treatment. Furthermore, the plant foliage, seeds, cultivation carrier and the like may be treated separately at the same time. In addition, when each is applied separately separately, it may be applied at the same time, and an interval of about 7 days may be provided, but at the time when any one of the active ingredients remains in the plant or the cultivation carrier, the other The above-mentioned “simultaneous period” is a concept including that at least a part of the period during which both are treated as described above, and the application work is not necessarily performed at the same time. There is no need. The effective amounts of the disease resistance inducer and the agricultural and horticultural plant disease control agent having bactericidal activity are the same as those described above for the agricultural and horticultural plant control agent.

In the disease control method for agricultural and horticultural plants of the present invention, the compounding ratio of the disease resistance inducer to the agricultural and horticultural plant disease control agent having bactericidal activity is 1 part by mass of the disease resistance inducer. Agro-horticultural plant disease control agent having bactericidal or insecticidal activity is blended in the range of about 0.01 to about 1000 parts by weight, preferably in the range of about 0.05 to about 100 parts by weight, more preferably about The range is from 0.1 to about 50 parts by mass.

In the method for controlling diseases of agricultural and horticultural plants according to the present invention, the seeds of the target plants are treated with a disease resistance inducer, and then the horticultural and horticultural fungicides are not sprayed until BBCH39, and after BBCH40. The agricultural and horticultural fungicide is sprayed at least once.

The agricultural and horticultural fungicide sprayed at least once in the period after BBCH 40 in the present invention is not particularly limited as long as it is a compound having bactericidal activity. For example, various agricultural and horticultural fungicides exemplified as an agricultural and horticultural plant disease control agent exhibiting bactericidal activity that can be used in combination with a disease resistance inducer can be suitably used. Moreover, you may use the disease resistance inducer used for the seed treatment of the object plant, etc. The agricultural and horticultural fungicide to be sprayed is not limited to one type, and two or more agricultural and horticultural fungicides may be used in combination.

The method for controlling diseases of agricultural and horticultural plants according to the present invention can omit spraying treatment of agricultural and horticultural fungicides and the like performed before BBCH39 after treating seeds with a disease resistance inducer. In the period after BBCH 40, the spraying time and the number of spraying of the agricultural and horticultural fungicide are not particularly limited, and the agricultural and horticultural fungicide may be sprayed any number of times at any time. In the period after BBCH 40, the agricultural and horticultural fungicide may be sprayed at least once and may be sprayed twice or more. Among them, it is preferable to spray the agricultural and horticultural fungicide at least once in the period of BBCH 40 to 59, or spray the agricultural and horticultural fungicide at least once in the period after BBCH60.

In the spraying treatment performed in the present invention after BBCH40, in addition to the agricultural and horticultural fungicide, the above-mentioned repellent and agricultural and horticultural plant disease control agent exhibiting insecticidal activity may be mixed or used together as necessary. it can.
Moreover, the processing method of the dispersion | spreading process performed at the time after BBCH40 uses a normal processing method, such as spraying the target plant body with the agricultural / horticultural germicide prepared suitably.

The BBCH method is a method in which the growth stage of all plants is expressed by a two-digit number, and the temporary growth stage of the plant is 0 to 9 (0: germination stage, 1: leaf development stage) in the second digit (number on the left side). 2: tillering period, 3: foliage elongation period, 4: growing period of harvesting part, 5: heading or flower bud forming period, 6: flowering period, 7: lactation period, 8: ripening period, 9: This is a method of classifying and expressing the details of the secondary growth stage of the plant in 0 to 9 stages in the first digit (number on the right side) (for example, non-death). (See Patent Documents 2 and 3). By quantifying the growth stage of the plant, the problem that the expression of the growth time varies depending on the crop and by region, so that the growth stage of the crop can be easily understood.

In the BBCH method, BBCH 31-39 means the plant's foliage elongation period, and corresponds to the time when the diameter of the foliage forms about 10-100% of the final form, or when the first to ninth sections can be confirmed. BBCH 40 to 59 correspond to the heading and flower bud formation period from the growth period of the vegetative growth part to be harvested, and BBCH 60 and later correspond to the flowering formation, withering and dormancy period (see FIG. 1).

In the conventional systematic control method, a plurality of agricultural and horticultural fungicide spraying treatments at each growth stage of the plant, specifically, the agricultural and horticultural fungicide applied to the BBCH 31 to 39 in the plant growth stage. A spraying process (T1 process), an agricultural and horticultural fungicide spraying process (T2 process) performed on BBCH 40 to 59, and an agricultural and horticultural fungicide spraying process (T3 process) performed after BBCH60 are essential. .
According to the method for controlling diseases of agricultural and horticultural plants of the present invention, after treating the seeds of the target plant with a disease resistance inducer, the agricultural and horticultural fungicides and the like before BBCH39 when the development of the leaf stop is completed There is no need to treat the target plant with the disease control agent. Stop leaf means the last leaf extracted before heading. In addition, in the period after BBCH 40, it is possible to omit or simplify the disease control process with a plurality of agricultural and horticultural fungicides or the like required in a normal systematic control method. Therefore, since the disease control method for agricultural and horticultural plants of the present invention shows the same control effect as before with a small amount of medicine, the work of the farmer can be saved. Moreover, there is no pathogen-specificity, and the control effect is demonstrated with respect to a wide range of diseases, and the appearance of drug-resistant strains can be suppressed.

Hereinafter, typical preparation examples and biological test examples of the present invention are shown, but the present invention is not limited thereto. In the preparation examples, “parts” indicates “parts by weight”, and each compound number indicates a compound number described in Table 1.

[Formulation Example 1]
Compound No. 1-12 10 parts Xylene 70 parts N-methylpyrrolidone 10 parts A mixture of polyoxyethylene nonylphenyl ether and calcium alkylbenzenesulfonate 10 parts or more are uniformly mixed and dissolved to prepare an emulsion.

[Formulation Example 2]
Compound No. 1-93 3 parts Clay powder 82 parts Diatomaceous earth powder 15 parts or more are mixed and ground uniformly to form a powder.

[Formulation Example 3]
Compound No. 1-12 5 parts Bentonite / clay mixed powder 90 parts 5 parts or more of calcium lignin sulfonate are uniformly mixed, kneaded with an appropriate amount of water, granulated and dried to form granules.

[Formulation Example 4]
Compound No. 1-93 20 parts Kaolin, synthetic highly dispersed silicic acid 75 parts Mixture of polyoxyethylene nonylphenyl ether and calcium alkylbenzenesulfonate 5 parts or more are uniformly mixed and ground to obtain a wettable powder.

Test Example 1 Wheat powdery mildew control effect test by mixing seed treatment agent (greenhouse test)
10 g of wheat (variety: chihoku wheat) dried seed was coated with 0.1 g of water, and treated with a treatment dosage amount of wettable powder as shown in the table so as to uniformly adhere to the water-treated seed. The treated seeds were air-dried and then sown in a plastic pot having a diameter of 10 cm and cultivated in a greenhouse. When the wheat grew at the 6th leaf / divided stage (about 70 days later), the wheat was inoculated with spores of powdery mildew (Blumeria graminis). Seven days after the inoculation, the disease index and the control value (%) of the developed leaves were calculated according to the following criteria. At this time, the disease index of the untreated section was 5.0. The results are shown in Table 3.

[Disease index]
0: No disease occurrence 0.5: Spot area ratio less than 10% 1: Spot lesion area ratio 10 to less than 20% 2: Spot lesion area ratio 20 to less than 30% 3: Spot lesion area ratio 30 to less than 40% 4: Spot area ratio 40 to less than 50% 5: Spot area ratio 50 to less than 60% 6: Spot area ratio 60 to less than 70% 7: Spot area ratio 70 to less than 80% 8: Spot area ratio 80 to Less than 90% 9: lesion area ratio 90 to less than 100% 10: lesion area ratio 100%
[Formula-1]
Control value (%) = (1− {onset index of treated area ÷ onset index of untreated area}) × 100

The following substances were used as control compounds.
Compound A: bittertanol
Compound B: fuberidazole
Compound C: triadimenol
Compound D: triticonazole
Compound E: guazatine
Compound F: Carboxin
Compound G: thiuram

In the table, “ga.i./100 Kg seed” means the amount (g) of the active ingredient (Active Ingredient) used per 100 kg of seeds (hereinafter, Tables 4 to 6 have the same meaning).

In the method for controlling diseases of agricultural and horticultural plants according to the present invention, the disease resistance inducer showed a control value superior to that of the control drug.

Test Example 2 Wheat red rust control effect test by mixed seed treatment (greenhouse test)
Similar to the method described in Test Example 1, 0.1 g of water is applied to 10 g of wheat (variety: Chihoku wheat) dry seeds, and the amount of wettable powder described in the table is uniformly applied to the water-treated seeds. It processed so that it might adhere to. The treated seeds were air-dried and then sown in a plastic pot having a diameter of 10 cm and cultivated in a greenhouse. When the wheat grew at the 6-leaf stage / dividing stage (about 70 days after sowing), the wheat was spray-inoculated with a spore suspension of Puccinia recondita. Seven days after the inoculation, the disease index and the control value (%) of the developed leaves were calculated according to the criteria of Test 1. The results are shown in Table 4.

In the greenhouse test, the disease resistance inducer showed a control value superior to that of the control drug by the method for controlling diseases of agricultural and horticultural plants of the present invention.

Test Example 3 Wheat powdery mildew control effect test by seed treatment (field test)
10 g of wheat (variety: chihoku wheat) dried seed was coated with 0.1 g of water, and treated with a treatment dosage amount of wettable powder as shown in the table so as to uniformly adhere to the water-treated seed. On the next day of the treatment, the treated seeds were sown in a 2 m ² (1 m × 2 m) compartment so that the sowing amount would be 120 kg / ha. In the next year when wheat emerges (around BBCH 51-59, about 190 days after sowing), the occurrence index and control value of naturally occurring powdery mildew (Blumeria graminis) on the following leaves and flag leaves according to the criteria of Test 1 (%) Was calculated. The results are shown in Table 5.

In the field test, the disease resistance inducer exhibits an effect superior to that of the control compound by the method for controlling diseases of the agricultural and horticultural plant of the present invention, and the dispersal treatment of the agricultural and horticultural fungicide (T2) performed at a time after BBCH40 in the growth stage. It has been proved that there is a possibility that the processing, T3 processing) can be reduced or reduced.

Test Example 4 Wheat red rust control effect test by seed treatment (field test)
10 g of wheat (variety: chihoku wheat) dried seed was coated with 0.1 g of water, and treated with a treatment dosage amount of wettable powder as shown in the table so as to uniformly adhere to the water-treated seed. On the next day of the treatment, the treated seeds were sown in 2 m ² (1 m × 2 m) sections so that the sowing amount would be 120 kg / ha. In the next year when the wheat emerges (around BBCH 51-59, about 270 days after sowing), the incidence index and control value of the naturally occurring red rust fungus (Puccinia recondita) according to the criteria of Test 1 for the subsequent leaves and the stationary leaves ( %) Was calculated and the effect was judged. The results are shown in Table 6.

Comparative Example 1 Wheat powdery mildew control effect test by foliar spray system (field test)
When the seed disinfectant was mixed with the control compound I, the compound 1-93 or the control compound H was treated so as to uniformly adhere to dry seeds of wheat (cultivar: Claire) at the treatment doses shown in the table. After the treatment, the sowing amount was equivalent to 180 kg / ha, and the treated seed was sown in a 20 m ² (2 m × 10 m) section. In the following year, in the system control section for seed treatment and foliage spraying, the foliar spray control compound C + D was systematically sprayed at the time when the wheat leaves were extracted or fully developed (BBCH 43-55). In the conventional control zone, the control compound J + K as a foliage spray was also sprayed during the internode elongation period (BBCH31-32) of wheat. According to the criteria of Test Example 1, the incidence index of naturally occurring powdery mildew (Blumeria graminis) was investigated and controlled for the next and stationary leaves at the time of wheat heading (around BBCH 75-83, 210-230 days after sowing). The value (%) was calculated. The results are shown in Table 7.

The following substances were used as control compounds.
Compound H: fluquinconazole
Compound I: fludioxonil
Compound J: Epoxyconazole
Compound K: Chlorothalonil

Comparative Example 2 Wheat Septoria leaf blight control effect test with foliar spray system (field test)
In the combined use of the seed disinfectant with the control compound I, the compound 1-93 or the control compound H was treated so as to uniformly adhere to the dried wheat (variety: Riband) seeds at the treatment doses shown in the table. After the treatment, the sowing amount was equivalent to 180 kg / ha, and the treated seed was sown in a 20 m ² (2 m × 10 m) section. In the following year, in the system control section for seed treatment and foliage spraying, the foliar spray control compound C + D was systematically sprayed at the time when the wheat leaves were extracted or fully developed (BBCH 43-55). In the conventional control zone, the control compound J + K as a foliage spray was also sprayed during the internode elongation period (BBCH31-32) of wheat. According to the criteria of Test 1, the incidence index of the naturally occurring Septoria tritici (Septoria tritici) disease was investigated and controlled for the next and stationary leaves at the time of wheat heading (around BBCH 75-83, 210-230 days after sowing). The value (%) was calculated. The results are shown in Table 8.

Comparative Example 3 Wheat red rust control effect test with foliar spray system (field test)
In the combined use of the seed disinfectant with the control compound I, the compound 1-93 or the control compound H was treated so as to uniformly adhere to the dried wheat (variety: Riband) seeds at the treatment doses shown in the table. After the treatment, the sowing amount was equivalent to 180 kg / ha, and the treated seed was sown in a 20 m ² (2 m × 10 m) section. In the following year, in the system control section for seed treatment and foliage spraying, the foliar spray control compound C + D was systematically sprayed at the time when the wheat leaves were extracted or fully developed (BBCH 43-55). In the conventional control zone, the control compound J + K as a foliage spray was also sprayed during the internode elongation period (BBCH31-32) of wheat. According to the criteria of Test 1, the incidence index of naturally occurring red rust fungus (Puccinia recondita) was investigated according to the criteria of Test 1, and the control value (about BBCH 75-83, after 210-230 days after sowing) %) Was calculated. The results are shown in Table 9.

In the field test, it was found that the disease controlling effect of the present invention was maintained until the next year when wheat emerged (around BBCH 51-59, about 270 days after sowing). From this result, the disease resistance inducer used in the present invention showed a remarkable sustained effect over the control compound. Further, from the comparative example, the method for controlling diseases of agricultural and horticultural plants according to the present invention is applied to the horticultural horticultural fungicide spraying treatment (T1 treatment) performed on the BBCH 31 to 39 in the growth stage by system treatment and the BBCH 40 to 59 in the growth stage. It has been proved that there is a possibility that the spraying treatment (T2 treatment) of the agricultural and horticultural fungicide performed can be reduced.

Unlike the prior art, the present invention applies a disease resistance inducer to seeds of a target crop or a carrier for seeding the target crop, so that diseases that develop from the seed of the target crop to the late stage of growth can be used for agriculture and horticulture. Control is possible without using a bactericide. By this effect, the safety of workers can be improved by reducing the amount of agricultural chemicals used and reducing the contact between the workers and the medicine.

The method for controlling diseases of agricultural and horticultural plants according to the present invention is an agricultural and horticultural fungicide that is performed at a time prior to BBCH40 in the spraying treatment of agricultural and horticultural fungicides, which has been conventionally essential in systematic control methods. The number of spraying processes can be omitted, and the number of spraying processes of the agricultural and horticultural fungicide performed at the time after BBCH40 can be set to at least one.

Claims (8)

1. Treating the seed of the target plant, the cultivation carrier for sowing the seed of the target plant, the soil for sowing the seed of the target plant, or the soil for transplanting the target plant grown on the cultivation carrier with a disease resistance inducer, Next, a method for controlling diseases of agricultural and horticultural plants, comprising spraying at least one agricultural and horticultural fungicide at a time after BBCH40.
2. The method for controlling diseases of agricultural and horticultural plants according to claim 1, wherein the period after BBCH 40 is BBCH 40 to 59.
3. The method for controlling diseases of agricultural and horticultural plants according to claim 1, wherein the time after BBCH40 is after BBCH60.
4. The method for controlling diseases of agricultural and horticultural plants according to any one of claims 1 to 3, wherein the target plant is a cereal or a crop for processing.
5. The method for controlling diseases of agricultural and horticultural plants according to any one of claims 1 to 3, wherein the target plant is wheat or barley.
6. The active ingredient of the disease resistance inducer is
   Formula (I):
   

   

   {Wherein R ¹ , R ² , R ³ , R ⁴ and R ⁵ may be the same or different and each represents a hydrogen atom; a halogen atom or a (C ₁ -C ₃ ) alkyl group.
   R ⁶ is a hydrogen atom; (C ₁ -C ₈ ) alkyl group; (C ₃ -C ₆ ) cycloalkyl group; phenyl (C ₁ -C ₆ ) alkyl group; halogen atom, cyano group, (C ₁ -C ₆ ) Alkyl group, halo (C ₁ -C ₆ ) alkyl group, (C ₃ -C ₆ ) cycloalkyl group, halo (C ₃ -C ₆ ) cycloalkyl group, (C ₁ -C ₆ ) alkoxy group, halo ( A substituted phenyl having one or more substituents which may be the same or different, selected from the group consisting of a C ₁ -C ₆ ) alkoxy group, a carboxyl group and a (C ₁ -C ₆ ) alkoxycarbonyl group (C _1- C ₆ ) alkyl group; phenyl group; halogen atom, cyano group, (C ₁ -C ₆ ) alkyl group, halo (C ₁ -C ₆ ) alkyl group, (C ₃ -C ₆ ) cycloalkyl group, halo (C ₃ -C ) Cycloalkyl _{group, (C} 1 -C ₆₎ alkoxy groups, halo _(C 1 -C ₆₎ alkoxy groups, 1 or the same or is selected from the group consisting of carboxyl group and _(C 1 -C ₆₎ alkoxycarbonyl group A substituted phenyl group having two or more substituents which may be different is shown.
   Y represents an oxygen atom or —N (R ⁷ ) — (wherein R ⁷ represents a hydrogen atom, a (C ₁ -C ₆ ) alkyl group, or a (C ₃ -C ₆ ) cycloalkyl group).
   W represents an oxygen atom or a sulfur atom. }
   The method for controlling diseases of agricultural and horticultural plants according to any one of claims 1 to 5, which is a 1,2,3-thiadiazole derivative represented by the formula:
7. The method for controlling diseases of agricultural and horticultural plants according to any one of claims 1 to 6, wherein the active ingredient of the disease resistance inducer is thiazinyl, acibenzoral-S-methyl, probenazole, NCI, INA, BIT and isothianyl. .
8. The disease of an agro-horticultural plant according to any one of claims 1 to 7, wherein the effective amount of the active ingredient of the disease resistance inducer is 0.0001 to 1 part by weight with respect to 100 parts by weight of the seed of the target plant. Control method.

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