JP2670853B2 - Agricultural and horticultural fungicides - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Purpose of the invention Industrial field of application The present invention is directed to O, O-dimethyl-O- (2,6-dichloro-4-methylphenyl) represented by the chemical structural formula described below.
Phosphorothioate (hereinafter referred to as "Compound A") and 2
-Agricultural and horticultural compositions containing a mixture of 2-methoxy-N- (2-oxo-1,3-oxazolidin-3-yl) acetate-2 ', 6'-xylidide (hereinafter referred to as "Compound B") as an active ingredient Regarding fungicides.

 Therefore, the present invention can be effectively used in the field of agriculture and horticulture.

2. Description of the Related Art Compound A, which is an active ingredient of the present invention, is specifically effective against seedling wilt disease and white silkworm caused by soil pathogenic fungi of plants, particularly Rhizoctonia spp. And Cortisium spp. 51-20571) shows little control effect against soil diseases such as Pythium and Phytophthora.

In addition, the compound B which is the other active ingredient of the present invention
Is effective against algal fungi such as Pythium and Phytophthora (JP-A-56-36473), but has little effect on soil diseases such as Rhizoctonia and Corticium.

Therefore, it is not preferable to use each of them alone as a soil disease controlling agent.

Further, a mixture of compound A and another agent is disclosed in JP-A-59-1370.
No. 2, JP-A-59-33204, and JP-A-60-97907.

However, a mixture of compound A and compound B is not known.

On the other hand, soil diseases such as seedling wilting of plants are often caused by not only a single pathogenic bacterium but also multiple pathogenic microbials. No effect.

At present, soil diseases such as seedling wilting of plants are controlled by soil fumigants such as chlorpicrin and methyl bromide, but they have environmental disadvantages due to volatilization of toxic gases.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention is a bacterium of the genus Rhizoctonia, a bacterium of the genus Corticium,
Agricultural and horticultural fungicides, especially soil disease control agents, that can simultaneously control soil diseases of plants caused by Pythium, Phytophthora, etc., and do not cause environmental pollution or damage to plants. is there.

B) Structure of the Invention Means for Solving the Problems The inventors of the present invention have made extensive studies to solve the above problems. As a result, they have found that the combined use of compound A and compound B represented by the following chemical structural formula is useful. That is, by using these two kinds of drugs in combination, beet, vegetables, flowers, etc. caused by Rhizoctonia spp., Cortisium spp., Pythium spp., Phytophthora spp. Therefore, a sufficient amount of control effect can be obtained at a lower dose than when these compounds are used alone, and a high synergistic effect can prevent soil disease such as plant wilting disease of plants by these multiple pathogenic bacteria. I found that it can be easily done by processing once.

(Compound A) O, O-dimethyl-O- (2,6-dichloro-4
-Methylphenyl) phosphorothioate (Compound B) 2-methoxy-N- (2-oxo-1,3-
Oxazolidin-3-yl) acetate-2 ', 6'-xylidide Formulation Method In formulating the agricultural and horticultural fungicide of the present invention, the active ingredient is added with various carriers and various auxiliary agents usually used in the formulation of pesticides, and the wettable powder and flowable are added by a conventional method. It can be used by formulating it into a desired form such as an agent and a powder. Examples of the carrier to be used include solid carriers such as clay, talc, bentonite, kaolin, diatomaceous earth, and silica, benzene, xylene, triene, alcohols (methanol, ethanol, isopropylpropanol, n-butanol, etc.), ketones ( Acetone, methyl ethyl ketone,
A liquid carrier such as cyclohexanone) or water is used. A suitable surfactant and other auxiliaries such as a stabilizer and a spreading agent may be added to these in an appropriate amount to be used as a lumber.

The mixing ratio of the compound A and the compound B, which are the active ingredients in the present invention, is appropriately mixed in the range of 1: 0.1 to 1:10, but the abandoned mine ratio may be adjusted depending on the use conditions and the occurrence of disease. It can be changed as appropriate. The agricultural and horticultural fungicides of the present invention are other fungicides, insecticides, plant growth regulators,
Can be used in combination with fertilizer.

 Next, examples of lumber production of the agricultural / horticultural germicide of the present invention will be shown.

 In the examples, all parts are parts by weight.

Example 1 (Wettable powder) Compound A (50 parts), compound B (10 parts), polyoxyethylene nonylphenyl ether (5 parts), sodium ligninsulfonate (2 parts), white carbon (3 parts), and fine powder clay (30 parts) were mixed with a hammer mixer. Finely pulverize to obtain a wettable powder containing 60% as an active ingredient.

Example 2 (Dust) 2.5 parts of compound A, 0.5 part of compound B, 1.0 part of white carbon, 95.8 parts of clay, 0.2 of isopropyl acid phosphate as a physical modifier, were mixed and ground with a Hanmer mill to obtain 3% as an active ingredient. Obtain the powder containing.

Example 3 (flowable agent) Compound A 50 parts, compound B 10 parts, polyoxyethylene noniphenyl ether 2 parts, polyethylene glycol 5 parts, xanthan gum 0.2 parts, water 32.8 parts are homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.). Stir for 30 minutes,
Mix to obtain a flowable agent containing 60% as the active ingredient.

The wettable powder and the flowable agent thus obtained were treated with water.
Dilute to 300 to 1000 times (1.6 to 3 kg as an active ingredient), 1
It may be mixed with the soil at a rate of 500 to 3000 per 0 are or may be used by irrigating the soil. In addition, the powder may be mixed with the soil in an amount of 20 to 40 kg per 10 ares (0.6 to 1.2 kg as an active ingredient) by a suitable spraying device.

In this case, the soil irrigation treatment may be performed immediately after sowing of the plant seeds or after germination, and the mixing treatment may be performed before sowing.

C) Effect of the Invention The agricultural and horticultural fungicide of the present invention exerts an excellent control effect against soil diseases such as rice, special crops, vegetables and petals by soil admixture treatment or soil irrigation treatment. That is, first of all, the fungicide for agricultural and horticultural use of the present invention includes rice seedling blight, barley snow rot, lawn brown patch, turf Pythium patch, lawn snow rot, sugar beet seedling blight, spinach, and the like. It exerts extremely high control effect against soil diseases such as seedling blight of vegetables and flower blight of petunia.

Secondly, the agricultural and horticultural fungicide of the present invention is used for diseases on the above
For example, lettuce wilt, lettuce downy mildew, Chinese cabbage rot, Chinese cabbage downy mildew, strawberry root rot, etc. can be simultaneously controlled.

Thirdly, the agricultural and horticultural fungicide of the present invention is a labor-saving and economical control agent because it can simultaneously control the soil diseases with a small dose.

Fourth, the fungicide for agricultural and horticultural use of the present invention does not adversely affect crops and the environment, and thus can be used safely.

Next, the usefulness of the agricultural / horticultural germicide of the present invention will be shown by test examples.

Test Example 1 Test for controlling seedling wilting of sugar beet (soil irrigation treatment) Rhizoctonia sol (Rizoctonia sol) was previously cultivated in a soil bran medium (mixed with 9 parts of soil and 1 part of bran).
ani: Rhizoctonia solani and Pythium debaryanum:
The soil contaminated with pathogens obtained by mixing Pythium devarianum) was packed in a paper pot for sugar beet raising (Nippon sugar beet sugar industry Co., Ltd. standard No. 1) and 1400 seeds of sugar beet seeds were sown. Dilute the wettable powder prepared according to the procedure above to the specified concentration, and apply this chemical solution to each paper pot.
1.4 equivalents were irrigated. The paper pot after the irrigation treatment was placed in a greenhouse and the seedlings were managed for 20 days.

This test was carried out in duplicate with one paper pot (1400 strains) per chemical concentration group.

For the disease onset, 20 days after the treatment, the number of dead seedlings against the number of germinated seedlings was investigated, and the dead seedling rate (%) and the control value (%) were calculated by the following formula. The results are shown in Table 1.

Moreover, the phytotoxicity was examined by an observational study on the degree of growth of the foliage and the presence or absence of abnormalities.

Test Example 2 Sugar beet seedling wilt control test (soil suspension treatment) A predetermined amount of the dust preparation prepared according to Example 2 was mixed with soil contaminated with pathogenic bacteria obtained according to Test Example 1, and packed in a paper pot for sugar beet raising seedlings. , 1400 seeds of sugar beet seeds were sown. This paper pot was placed in a greenhouse and the seedlings were managed for 20 days.

This test was carried out in duplicate with one paper pot (1400 strains) per chemical concentration group.

The onset of disease and the investigation of phytotoxicity were carried out 20 days after the treatment according to Test Example 1. The results are shown in Table 2.

Test Example 3 Cucumber seedling wilt control test (soil irrigation treatment) The pathogen-contaminated soil obtained according to Test Example 1 had a diameter of 15 cm and a depth of
20 cm of cucumber seeds were sown in a biscuit pot of 5 cm in size, the flowable agent prepared according to Example 3 was diluted to a predetermined concentration, and this chemical solution was irrigated in an amount equivalent to 3 per 1 m ² . The pot after the irrigation treatment was placed in a greenhouse.

This test was carried out in triplicate with one pot (20 strains) per drug solution concentration group.

The disease onset investigation and the phytotoxicity investigation were carried out in accordance with Test Example 1 10 days after the treatment. The results are shown in Table 3.

Test Example 4 Strawberry Blight and Root Rot Control Test (Soil Irrigation Treatment) Rizoctonia solan was previously cultured on a soil bran medium (a mixture of 9 parts of soil and 1 part of bran).
i: Rhizoctonia solani) and a spore suspension of Phythphthora fragariae (Phythphthora fragariae) cultivated in cornmeal medium (20 to 30 conidiospores each) grown in a greenhouse Was inoculated with the pathogen by spraying or injection. On the day after the inoculation, the flowable agent prepared according to Example 3 was diluted to a predetermined concentration, and this drug solution was irrigated in an amount corresponding to 3 per 1 m ² . The pot after the irrigation treatment was placed in a greenhouse.

This test was carried out with 2 m ² of 3 consecutive times per 1 chemical solution concentration group.

The onset of disease and the investigation of phytotoxicity were carried out 14 days after the treatment in accordance with Test Example 1. The results are shown in Table 4.

Claims (1)

(57) [Claims] 1. O, O-dimethyl-O- (2,6-dichloro-4
-Methylphenyl) phosphorothioate and 2-methoxy-N- (2-oxo-1,3-oxazolidin-3-yl) acetate-2 ', 6'-xylidide are contained as an active ingredient. Agricultural and horticultural fungicides.