JP2008037864A - Parasitic plant control agent and use thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a parasitic plant control agent and the use thereof, which effectively control a parasitic plant parasitizing a crop. <P>SOLUTION: Disclosed is a parasitic plant control agent comprising thiadinil or the like as an active ingredient. Also disclosed is a method of the utilization of the parasitic plant control agent, which is characterized in that an effective amount of the parasitic plant control agent is applied to a parasitic plant or a soil. As a result, the yield of the crop can be recovered to the same level as that achieved when the plant has no parasitic plant. The parasitism of a parasitic plant can be highly prevented, and therefore the occurrence of a next generation of parasitic plant can also be prevented. Thus, the level of contamination with a parasitic plant in an agricultural field can be decreased. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a parasitic plant control agent and a method for using the same.

In the arid zone belonging to the tropical or subtropical region of Africa and West Asia, plant parasitic plants such as Striga (scientific name: striga, English name: witchweed) and Orobanki (scientific name: Orobanche) of the genus Oleoptera are included. Distributed. These parasitic plants have damaged various crops including cereals, beans, eggplants, tomatoes and tobacco. Parasitic plants parasitize the roots, etc., gradually seize nutrients, and eventually grow to greatly reduce crop yield. These are not noticeable because they are initially low and unnoticeable. Therefore, if the control of these parasitic plants is delayed, the flowers will bloom, and over 100,000 grains of very fine seeds will be planted per individual. The seed waits without germination until it encounters the host. Since it may survive for more than 10 years without germination, its control is extremely difficult. In some parts of Africa, parasitic plants such as Striga are the greatest biological threat to agriculture, surpassing insects and disease. In particular, crops that have been improved in variety and have high yields have the problem of becoming susceptible to parasitic plants. Due to the movement of contaminated seeds, etc., crop damage caused by parasitic plants has recently expanded in Europe and Australia.
As a method of protecting crops from parasitic plants, conventionally known as trap crops, cultivation that reduces the density of parasitic plants by combining rotation and fallowing with crops that encourage the germination of parasitic plants but are less susceptible to parasitics. We have been pest control.
However, as described above, the seeds that have been produced once are numerous and survive for many years. Therefore, once they are contaminated by parasitic plants, it is difficult to control them. Recently, a herbicide that is selective for crops (for example, an ALS inhibitor, used in cereal and legume fields) is used to control the crop by combination with a trap crop. In addition, a method of inducing and controlling so-called suicide germination by utilizing a characteristic of host-specific germination and utilizing a germination promoting substance (for example, see Patent Documents 1 to 3) has been devised. On the crop side, the creation of resistant crops and the creation of crops with less germination inducer production are also being carried out.

Japanese Patent Laid-Open No. 10-251243 JP-A-11-139907 JP 11-139908 A

There is a need for a parasitic plant control agent that has a high control effect on parasitic plants, is simpler, and has excellent cost performance. Furthermore, there is a need for a parasitic plant control agent and control method that enables high yields of crops with improved varieties without being affected by parasitic plants.
Herbicides are limited to crops that can be applied due to selectivity. Parasitic plant-resistant crops are not effective against physiological mutants of parasitic plants, so they cannot be said to be a stable countermeasure. Suicide germination inducers are not yet at a satisfactory level. In addition, crops with low suicide germination product production are currently not harvested to the normal species and are not accepted outside the parasitic plant-contaminated areas, so they are not widely cultivated until contamination progresses. Don't be.
An object of this invention is to provide the parasitic plant control agent which can control the parasitic plant parasitic on a crop effectively, and its usage method.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have treated a parasitic plant control agent containing a compound such as thiazinyl as an active ingredient on the seeds, foliage or surrounding soil where the crops are cultivated. The present inventors have found that parasitic plants can be inhibited from infesting target crops and have completed the present invention.

That is, the present invention
[1] A parasitic plant control agent comprising, as an active ingredient, one or more compounds selected from thiazinyl, probenazole, 2-chloroisonicotinic acid and isothianyl,
[2] The parasitic plant control agent according to [1], wherein the target to be controlled is a root parasitic plant,
[3] The parasitic plant control agent according to [2], wherein the root parasitic plant is Striga or Orobanchi.
[4] The parasitic plant control agent according to any one of [1] to [3], wherein the active ingredient is thiazinyl,
[5] A method for using a parasitic plant control agent, which comprises treating the parasitic plant or soil with an active ingredient amount of the parasitic plant control agent according to any one of [1] to [4], and
[6] The method for using the parasitic plant control agent according to [5], wherein the treatment to the parasitic plant or the soil is a soil treatment in which the parasitic plant can absorb the active ingredient from the root.
[7] The parasitic plant control agent according to any one of [1] to [4], wherein the active ingredient is contained in an amount of 0.01 to 60% by weight based on the parasitic plant control agent,
[8] The parasitic plant control agent according to [7], wherein the active ingredient is contained in an amount of 0.1 to 50% by weight based on the parasitic plant control agent.
[9] The method for using a parasitic plant control agent according to [5] or [6], wherein the amount of active ingredient is 5.0 to 5000 g per hectare.

By using the parasitic plant control agent of the present invention, the crop yield can be restored to the level of the crop without parasitic. The same applies when cultivating crops that are highly sensitive to parasitic plants.
Moreover, generation | occurrence | production of the next generation can be suppressed by suppressing the parasitic plant parasitic in high level. That is, since the level of contamination by parasitic plant seeds in the field can be lowered, crops can be cultivated continuously. Furthermore, the control effect is increased by repeatedly treating each crop cultivation at a level that does not lead to the formation of flower buds of the parasitic plant.

Below, the parasitic plant control agent of this invention and its manufacturing method are demonstrated concretely.
As an active ingredient, for example, thiazinyl (generic name, abbreviated as “TDN”), probenazole (generic name, abbreviated as “PBZ”), 2-chloroisonicotinic acid (chemical name, abbreviated as “INA”) ), Isotianil (generic name, chemical name: N- (2-cyanophenyl) -3,4-dichloroisothiazole-5-carboxamide, abbreviated as “CICA”), and the like. It is not limited to these. Preferred is thiazinyl, probenazole or isothianyl. These compounds are particularly suitable for pest control and thorough control in the field where they occur because they are compounds that have a high permissible concentration for crops and are unlikely to cause phytotoxicity. Many of these active ingredients used in the present invention have a common action characteristic of a resistance inducer and have been registered as agricultural fungicides. However, among the compounds having such actions, salicylic acid did not show favorable results such as strong phytotoxicity and not showing a very high parasitic plant control activity. Although it is necessary to select an appropriate compound depending on the type of crop to be applied, thiazinyl is a particularly preferred compound as a compound having low toxicity to the crop plant, and exhibits a high control effect in terms of activity.

  These active ingredients are known compounds described in documents such as the Pesticide Manual (Thirst Edition). Isotianil (N- (2-cyanophenyl) -3,4-dichloroisothiazole-5-carboxamide) is a compound described in JP-T-2001-522840 (Production Example No. 1).

The active ingredient of the parasitic plant control agent of the present invention can be blended at an arbitrary ratio depending on the dosage form, and the blending ratio of the active ingredient in the composition is 0.01-60 with respect to the total amount of the parasitic plant control agent. % By weight is preferred, more preferably 0.1 to 50% by weight.
Moreover, the parasitic plant control agent of this invention can also add 1 or 2 or more other agricultural chemical components etc. as an active ingredient as needed. Examples of other agrochemical components include herbicides, fungicides, insecticides, plant growth regulators, insect growth regulators, and the like. A synergistic effect can be obtained by adding these agrochemical components and the like. For example, although Striga mainly infests Gramineae plants, it suppresses the growth of germinated Striga by using, for example, a sulfonylurea or imidazolinone dicotyledon (broadleaf) weed selective herbicide. Control efficiency can be increased by the cooperative action of suppressing the invasion of the striker into the host root by the parasitic plant control agent.

The parasitic plant control agent of the present invention can be produced and used according to a conventional method on an agrochemical formulation by supporting an active ingredient as it is or on a liquid or solid carrier.
Solid carriers that can be used in producing the parasitic plant control agent of the present invention are classified into water-insoluble solid carriers and water-soluble solid carriers. Examples of water-insoluble solid carriers include clay and calcium carbonate. , Talc, bentonite, calcined diatomaceous earth, unfired diatomaceous earth, hydrous silicic acid, cellulose, pulp, rice bran, wood powder, kenaf powder and the like. Examples of the water-soluble solid carrier include inorganic salts such as ammonium sulfate, sodium chloride, and potassium chloride, sugars such as glucose, sucrose, fructose, and lactose, urea, urea formalin condensate, organic acid salt, and water-soluble amino acids. Etc. These solid carriers may be used alone or in combination of two or more. The addition amount of these solid carriers is usually 0.5 to 99.79% by weight, preferably 20 to 98% by weight, based on the total amount of the parasitic plant control agent.

  The liquid carrier is not particularly limited as long as it does not cause phytotoxicity. For example, water, alcohols (for example, methanol, ethanol, isopropanol, butanol, cyclohexanol, ethylene glycol, diethylene glycol, propylene glycol, hexylene glycol, polyethylene) Glycol, polypropylene glycol, etc.), ketones (eg, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone, γ-butyrolactone, etc.), ethers (eg, cellosolve, etc.), aliphatic hydrocarbons (eg, kerosene, mineral oil, etc.), aromatic carbonization Hydrogen (for example, xylene, solvent naphtha, alkylnaphthalene, etc.), ester (for example, diisopropylpropyl phthalate, dibutyl phthalate, dioctyl phthalate, adipic acid Steal, etc.), amides (eg, dimethylformamide, diethylformamide, dimethylacetamide, etc.), dimethyl sulfoxides, nitrogen-containing carriers (N-alkylpyrrolidone, etc.), Coconut oil, castor oil, etc.). The addition amount of these liquid carriers is usually 0.5 to 99.79% by weight, preferably 20 to 98% by weight, based on the total amount of the parasitic plant control agent.

  Further, the parasitic plant control agent of the present invention, to maximize the medicinal effects of the contained agricultural chemical active ingredients, or to improve the quality of the parasitic plant control agent, if necessary, a surfactant, Various auxiliary components such as a binder, a grinding aid, an absorbent, a decomposition inhibitor, and a pigment are added. Further, it is necessary to determine the selection and blending ratio so as to match the properties of the active ingredients used.

  Surfactants that can be added to the parasitic plant control agent of the present invention include nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene polystyryl phenyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkyl ester, alkyl Anionic surfactants such as naphthalene sulfonate, alkyl sulfate, polyoxyethylene polystyryl phenyl ether sulfate, polyoxyethylene alkyl ether sulfonate, polyoxyethylene polystyryl phenyl ether phosphate, dioctyl sulfosuccinate, etc. Is exemplified.

  Examples of the binder that can be used in producing the parasitic plant control agent of the present invention include natural, semi-synthetic, and synthetic polymers. Examples of the natural one include starch, Examples include arabic gum, tragacanth gum, guar gum, mannan, pectin, sorbitol, xanthan gum, dextran, gelatin, and casein. Examples of the semi-synthetic system include dextrin, soluble starch, oxidized starch, pregelatinized starch, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose. Examples of the synthetic system include polyvinyl alcohol, polyacrylamide, polyvinyl pyrrolidone, sodium polyacrylate, ethylene-acrylic acid copolymer, maleic anhydride copolymer, and polyethylene glycol. However, it is not limited to these. Moreover, these can be used individually by 1 type, or it can also use 2 or more types together, The addition amount is 0.1-20 weight% normally with respect to the parasitic plant control agent whole quantity, Preferably 0.3 to 10% by weight.

  Although it does not specifically limit as a grinding | pulverization adjuvant, For example, synthetic | combination support | carriers, such as bentonite, a zeolite, a talc, an acid clay, an activated clay, or a raw material, white carbon (silica), saccharides, dextrin, powdered cellulose, etc. Plant carriers, surfactants such as anionic surfactants, other organic compounds, resins and the like can be used.

  Absorbents are used to pulverize and premix liquid agrochemical ingredients such as oil, and absorb the liquid components and give the fluidity of the granules. Mineral, plant or chemical fine powder is added. The absorbent is also a so-called carrier (a bulking agent), and a carrier having a high oil absorption capacity is suitable as a powdering aid. For example, oil-absorbing fine powders such as white carbon, diatomaceous earth, and microcrystalline cellulose can be used.

Examples of the decomposition inhibitor include antioxidants such as butylhydroxytoluene (BHT) or butylhydroxyanisole (BHA), hydroquinone ultraviolet absorbers, salicylic acid ultraviolet absorbers, benzophenone ultraviolet absorbers, and benzotriazole ultraviolet absorbers. Or ultraviolet absorbers, such as a cyanoacrylate type ultraviolet absorber, can be used.
The dye is not particularly limited, and for example, red 202, iron oxide, titanium oxide and the like can be used.

  In the parasitic plant control agent of the present invention, other components can be mixed or used as necessary. For example, in order to avoid ingestion (including accidental ingestion) by birds and other animals during seed treatment. Repellents and other ingredients can also be included. Repellents include, for example, odorous compounds such as naphthalene compounds, castor oil, pine resin, polybutane, diphenylamine pentachlorophenol, quinone, zinc oxide, aromatic solvents and other eating inhibitors, N- (trichloromethylthio) -4-cyclohexene Bitter substances such as -1,2-carboximide, anthraquinone, copper oxalate, terpene oil, herb oils such as paradichlorobenzene, arylisothiocyanate, amyl acetate, anethole, citrus oil, cresols, geranium oil or lavender oil , Menthol, methyl salicylate, nicotine, pentanethiol, pyridines, tributyltin chloride, thiram, ziram, carbamate insecticides (eg, methiocarb), guazatine, chlorinated cyclodiene insecticides (eg, endrin), organophosphorus insecticides (Example If it is possible to illustrate the fenthion, etc.) and the like. As other components, for example, 3-chloro-4-toluidine hydrochloride, strychnine 20, 25-diazacholesterol hydrochloride (code name: SC-12937) and the like are used as toxic substances or growth inhibitory substances (fertility agents). It can be illustrated.

  When the parasitic plant control agent of the present invention is used, it may be prepared and used in an appropriate dosage form according to the purpose in accordance with conventional methods on agrochemical formulations. For example, a solid carrier, a liquid carrier, a surfactant, and other necessary Accordingly, it may be mixed with an auxiliary agent or the like to prepare a dosage form such as granules, wettable powders, powders, flowables, emulsions, liquids, suspensions, and granular wettable powders.

  Many kinds of parasitic plants are known, and there are semi-parasitic ones with chloroplasts and total parasitic ones that have no chloroplasts and depend on the host plant for all nutrients. For example, a sandalid mistletoe family, a giant mistletoe family, a Misodendronae family, a sandalwood family sandalwood, a thorny spring, a canopy, etc. ), Cynomoriaceae, Dendrobelliaceae, Rafflesia, Rafflesiaceae, Dermatophaceae, Hydnoaceae, Other camphoraceae, Krameriaceae, Lennoaceae (Lennoaceae) eae), Convolvulaceae, Papaveraceae, etc., and part of Scrophulariaceae (Scrophylliacede, Striphyaiatica (scientific name), Striga hermontica (scientific name). Striga gesnerioide (scientific name), Striga Lour (scientific name, etc.), Hana crabs (Orobanchaeae) .

  Parasitic plants in which the parasitic plant control agent of the present invention is effective are not particularly limited, but those that cause damage in edible plant cultivation are important. For example, the Striga genus of the genus Sphagnum, the genus Orobanche of the crabs And the genus Cuscuta, the Visacaceae family, the mistletoe genus, and the like. Especially, it is especially useful with respect to the plant of the genus Orobanki which is a parasitic plant of the genus Oleaceae, the Striga genus (English name Witchweeds) which is a parasitic plant of the genus Pleurotus. The parasitic part may be a root part, a leaf part, a stem part, or the like, but in the case of soil treatment which is a preferred embodiment of the present invention, a root parasitic parasitic plant (root parasitic plant) In particular, it is possible to exert a particularly high effect. The Orobanchi genus plant of the above Amaranthaceae and the Striga genus plant of the genus Stigmaaceae are root parasitic.

  As a plant to which the parasitic plant control agent of the present invention can be applied, the host is often limited to a specific host depending on the parasitic plant, but depending on the species, there are also plants that parasitize various types of plants. The plant is not particularly limited as long as it is a parasitic plant, for example, grasses, solanaceae and legumes, other celery plants such as parsley, celery, and carrot, cucurbits such as cucumber and melon, sunflower, etc. Asteraceae plants, auroaceae plants such as geranium, and cruciferous plants such as turnip, radish, rapeseed and lettuce are also targeted. Preferably, gramineous plants such as corn, sorghum, sugar cane, wheat, rice, etc., solanaceous plants such as tomato, eggplant, pepper, paprika, potato, pepper, tobacco, soy beans, red beans, peanuts, peas, green beans, sweet peas, broad beans , Legumes such as lentil, alfalfa and red clover.

  The parasitic plant control agent of the present invention is particularly suitable for use in agricultural fields such as paddy fields, fields, pastures, etc., but other scenes such as grassland in parks, orchards, forested land, forests, creation It can also be used to control parasitic plants such as forests. The present invention can be applied not only to these aspects but also to any place and target parasitic plants depending on the purpose in order to control undesirable parasitic plants.

As a method of application, it can be applied by the same method as ordinary agricultural chemicals, for example, direct spraying of granule by hand, etc., and it is made liquid by diluting or not diluting in granule, powder or water etc. Examples of treatments include a human-powered spreader, an electric spreader, a back-loaded power spreader, a traveling power spreader, a tractor-mounted spreader, and an aerial spreader such as a manned or unmanned helicopter. The treatment method is not particularly selected such as seed treatment (seed dressing, coating, seed soaking, etc.), soil treatment, foliage treatment on the target crop (parasitic plant), but it can be absorbed by the target crop (parasitic plant). It is necessary to be. As a soil treatment method to be absorbed from roots by parasitic plants, soil irrigation treatment in which the liquid preparation stock solution is used as it is or prepared by diluting various preparations and applied to the plant stock, etc., soil of solid preparations such as granules and wettable powders For example, the mixing treatment into soil, the covering soil mixing treatment at the time of sowing, the application of the stock source, the introduction into the paddy water, etc. can be exemplified. The method of treating only the parasitic plant directly does not give a favorable result. Preferably, it is an irrigation treatment such as a chemical solution to the soil. Seed treatment is also a preferred treatment method.

  The treatment amount of the parasitic plant control agent of the present invention may be appropriately selected from the range of 5.0 to 5000 g per hectare as an active ingredient amount. The amount is preferably 20 to 2000 g per hectare, more preferably about 200 g. The application amount of the parasitic plant control agent used in the present invention varies depending on the compounding ratio of the active ingredient compound, weather conditions, formulation form, application time, application method, application place, disease to be controlled, target crop, etc. The hitting active ingredient compound may be appropriately selected from the range of 0.0001 to 40%, preferably 0.001 to 10%. In the case of normal treatment of granules or powder or treatment of seeds, the preparation may be undiluted or treated in a high concentration state, such as seed dressing, seed soaking, and seed coating.

  Hereinafter, specific examples of the present invention will be described, but the present invention is not limited to these examples. In the following Examples and Comparative Examples, “part” means “part by weight”.

Formulation Example 1
Thiazinyl 10 parts Xylene 70 parts N-methylpyrrolidone 10 parts Mixture of polyoxyethylene nonylphenyl ether and calcium alkylbenzenesulfonate 10 parts The above is mixed and dissolved uniformly to prepare an emulsion.
Formulation Example 2
Thiazinyl 3 parts Clay powder 82 parts Diatomaceous earth powder 15 parts The above is mixed and ground uniformly to make a powder.

Formulation Example 3
Provenazole 5 parts Bentonite and clay mixed powder 90 parts lignin sulfonate 5 parts The above is uniformly mixed, kneaded with an appropriate amount of water, granulated and dried to give granules.
Formulation Example 4
N- (2-cyanophenyl)-
3,4-Dichloroisothiazole-5-carboxamide 20 parts Kaolin, synthetic highly dispersed silicic acid 75 parts Polyoxyethylene nonylphenyl ether and calcium alkylbenzenesulfonate 5 parts .

Production Example 5
Thiazinyl 10 parts Calcium lignin sulfonate 5 parts Sodium lauryl sulfate 3 parts Xanthan gum 0.2 part White carbon 5 parts Water 76.8 parts The above is mixed and wet-pulverized to form a suspension.

Production Example 6
Thiazinyl 20 parts Polyethylene glycol dialkyl aryl ether sulfate
5 parts Calcium lignin sulfonate 10 parts Diatomaceous earth 65 parts After mixing and grinding well, add a small amount of water, knead and knead, granulate with an extrusion granulator, dry and use as granulated wettable powder .

  The parasitic plant control agent was tested by the following method. The drugs used were thiazinyl (TDN), probenazole (PBZ), salicylic acid (SA), 2-chloroisonicotinic acid (INA) and N- (2-cyanophenyl) -3,4-dichloroisothiazole- as active ingredients. 5-carboxamide (CICA, CAS registry number 224049-04-1) was used.

Test Example 1 Seed Soaking Treatment Method Red clover seeds were immersed in a chemical solution prepared to a predetermined concentration for 24 hours. A pot filled with soil (1/10000 are) was sown with red clover seeds and a pot seed around them and cultivated in a greenhouse. The growth of red clover, the number of parasites of Orobanche minor and the growth were observed visually. The growth of the crocodile was evaluated in four stages as follows.

Table 1 Parasitic plant growth stage S1: Small tuber of 2 mm or less S2: Small tuber of 2 mm or more S3: Adventitious root formation developed to some extent S4: Bud formation

Results A trend toward a decrease in the total number of parasitic parasites was observed in the treatment with 20 ppm TDN and 200 ppm INA. In addition, the decrease in S4 (bud formation) due to the INA treatment is large.

Table 2 Test on effect of red clover on moss parasite (seed immersion treatment)
――――――――――――――――――――――――――――
Drug treatment concentration Average number of parasites S4 bud formation
(ppm) Per share Per share ――――――――――――――――――――――――――――
TDN 2000 2.01 0.15
200 2.57 0.21
20 1.07 0.08
――――――――――――――――――――――――――――
PBZ 200 1.59 0.29
20 1.50 0.28
――――――――――――――――――――――――――――
INA 200 1.03 0.02
20 2.28 0.22
――――――――――――――――――――――――――――
SA 200 2.17 0.44
20 2.09 0.38
――――――――――――――――――――――――――――
No treatment zone 2.55 0.52
――――――――――――――――――――――――――――

Test Example 2 Soil Irrigation Treatment Method Pots (1/10000 are) filled with soil were sown with red clover seeds and seedlings around them, and cultivated in a greenhouse. The medicinal solution prepared to a predetermined concentration at a rate of 20 ml / pot was seeded 10, 20, and 30 days after sowing.
Results A dose-related decrease in TDN was seen. It was effective at a concentration of 200 ppm or more. Almost no parasitic was observed at 2000 ppm TDN. The number of parasitics was slightly reduced by the INA 200 ppm treatment. In general, S4 (bud formation) decreased in all treatment sections.

Table 3 Effect test on red clover against moss parasite (soil treatment)
――――――――――――――――――――――――――――
Drug treatment concentration Average number of parasites S4 bud formation
(ppm) Per share Per share ――――――――――――――――――――――――――――
TDN 2000 0.03 0.00
200 0.53 0.16
20 1.71 0.10
2 2.36 0.17
――――――――――――――――――――――――――――
PBZ 200 1.52 0.08
20 3.17 0.08
2 2.47 0.13
――――――――――――――――――――――――――――
INA 20 1.03 0.08
2 1.49 0.07
――――――――――――――――――――――――――――
SA 20 2.47 0.03
2 1.75 0.06
――――――――――――――――――――――――――――
No treatment zone 2.55 0.52
――――――――――――――――――――――――――――

Test Example 3 Foliage Dispersal Treatment Method A pot filled with soil (1/10000 are) was sown with red clover seeds and around them seeds and cultivated in a greenhouse. A chemical solution diluted with water to a predetermined concentration after seeding 10, 20, and 30 days after the red clover 1-2 leaf stage was sprayed with a sufficient amount onto the foliage with an atomizer.
Results A dose-related decrease in TDN was seen. A high effect was observed at 2000 ppm. However, there were more parasitics than soil treatment. The first treatment with 200 ppm of SA caused 4/6 and 1/5 red clover to die in 2 pots. The number of parasitics of SA200ppm was large. The number of parasites decreased with INA. However, the growth of the host was also suppressed in the 200 ppm treated area.

Table 4 Effect test on the red clover against Paramecium parasitism (stem and leaf treatment)
――――――――――――――――――――――――――――
Drug treatment concentration Average number of parasites S4 bud formation
(ppm) Per share Per share ――――――――――――――――――――――――――――
TDN 2000 0.24 0.03
200 1.02 0.06
20 1.49 0.15
――――――――――――――――――――――――――――
PBZ 200 1.75 0.18
20 2.24 0.16
――――――――――――――――――――――――――――
INA 20 0.94 0.03
2 0.99 0.05
――――――――――――――――――――――――――――
SA 20 4.05 0.38
2 1.91 0.17
――――――――――――――――――――――――――――
No treatment zone 2.55 0.52
――――――――――――――――――――――――――――

Test Example 4 Seed Soaking Treatment Method Red clover seeds were immersed for 24 hours in a chemical solution prepared to a predetermined concentration. A pot filled with soil (1/10000 are) was sown with red clover seeds and a pot seed around them and cultivated in a greenhouse. The growth of red clover, the number of parasites of Orobanche minor and the growth were observed visually.
Results In both TDN and CICA treatment groups, there was a decreasing trend in the total number of parasitic parasites and S4 bud formation. No phytotoxicity was observed in any treatment area.

Table 5 Effect test on red clover against narcissus parasite (seed immersion treatment)
――――――――――――――――――――――――――――
Drug treatment concentration Average number of parasites S4 bud formation
(ppm) Per share Per share ――――――――――――――――――――――――――――
TDN 200 1.05 0.12
20 1.12 0.10
――――――――――――――――――――――――――――
CICA 200 1.15 0.09
20 1.36 0.11
――――――――――――――――――――――――――――
No treatment zone 2.08 0.45
――――――――――――――――――――――――――――

Test Example 5 Soil Irrigation Treatment Method Pots (1/10000 are) filled with soil were sown with red clover seeds and gypsophila seeds around them, and cultivated in a greenhouse. The medicinal solution prepared to a predetermined concentration at a rate of 20 ml / pot was seeded 10, 20, and 30 days after sowing.
Results A decrease in the number of parasitics was observed at 2000 and 200 ppm for both TDN and CICA. In addition, S4 (bud formation) decreased in all treatment groups of TDN and CICA. A strong phytotoxicity was observed at 2000 ppm of TDN, a weak phytotoxicity was observed at 200 ppm, and a weak phytotoxicity was observed at 2000 ppm of CICA. All symptoms were growth inhibition.

Table 6. Effect test on the red clover against the moss parasite (soil treatment)
――――――――――――――――――――――――――――――――――
Drug Treatment concentration Average number of parasites S4 bud formation Chemical damage
(ppm) Per share Per share ――――――――――――――――――――――――――――――――――
TDN 2000 0.22 0.07 ++
200 1.55 0.11 +
20 2.22 0.13 −
――――――――――――――――――――――――――――――――――
CICA 2000 0.15 0.04 +
200 1.39 0.09 ±
20 1.99 0.10 −
――――――――――――――――――――――――――――――――――
Untreated zone 2.08 0.45-
――――――――――――――――――――――――――――――――――

Test Example 6 Foliar Dispersion Treatment Method A pot filled with soil (1/10000 are) was seeded with red clover seeds and a gecko seed around them, and cultivated in a greenhouse. A chemical solution diluted with water to a predetermined concentration was sprayed on the stems and leaves with an atomizer 10, 20, and 30 days after sowing from the 1-2 leaf stage of the red clover.
Results A decrease in the number of parasites was observed at 2000 ppm for both TDN and CICA, but the decreasing tendency at 200 ppm or less was unclear. In addition, both TDN and CICA had a tendency to decrease in S4 bud formation at 2000 and 200 ppm. In any treatment area, no phytotoxicity was observed.

Table 7 Effect test on the red clover against the moss parasite (stem and leaf treatment)
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Drug treatment concentration Average number of parasites S4 bud formation
(ppm) Per share Per share ――――――――――――――――――――――――――――
TDN 2000 0.34 0.15
200 1.92 0.35
20 2.25 0.49
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CICA 2000 0.44 0.03
200 2.05 0.25
20 3.01 0.60
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No treatment zone 2.08 0.45
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Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on a Japanese patent application filed on July 13, 2006 (Japanese Patent Application No. 2006-193083), the contents of which are incorporated herein by reference. Also, all references cited herein are incorporated as a whole.

  ADVANTAGE OF THE INVENTION According to this invention, the parasitic plant control agent which can control the parasitic plant parasitic on a crop effectively, and its usage method can be provided.

Claims (9)

A parasitic plant control agent comprising one or more compounds selected from thiazinyl, probenazole, 2-chloroisonicotinic acid and isothianyl as active ingredients. The parasitic plant control agent according to claim 1, wherein the control target is a root parasitic plant. The parasitic plant control agent according to claim 2, wherein the root parasitic plant is Striga or Orobanchi. The parasitic plant control agent according to any one of claims 1 to 3, wherein the active ingredient is thiazinyl. The use method of the parasitic plant control agent characterized by processing the amount of active ingredients of the parasitic plant control agent of any one of Claims 1 thru | or 4 to a parasitic plant or soil. The method for using a parasitic plant control agent according to claim 5, wherein the treatment in the parasitic plant or soil is a soil treatment in which the parasitic plant can absorb the active ingredient from the root. The parasitic plant control agent according to any one of claims 1 to 4, wherein the active ingredient is contained in an amount of 0.01 to 60% by weight with respect to the parasitic plant control agent. The parasitic plant control agent according to claim 7, wherein the active ingredient is contained in an amount of 0.1 to 50% by weight based on the parasitic plant control agent. The method for using a parasitic plant control agent according to claim 5 or 6, wherein the amount of the active ingredient is 5.0 to 5000 g per hectare.