JPS617204A - Seed disinfectant - Google Patents

Abstract

PURPOSE:A seed disinfectant that contains, as active ingredients, a combination of methyl 1-(n-butylcarbamoyl)-2-benzimidazolcarbamate and 1,2-dibromo-2,4-dicyanobutane, thus showing high effect against resistant fungi. CONSTITUTION:The objective seed disinfectant conains, as active ingredients, a mixture of (A) at least one selected from benomyl of formula I, 2-benzimidazole carbamate of formula II, 2-(4-thiazolyl)benzimidazole of formula III and thiophanate methyl of formula IV and (B) 1,2-dibromo-2,4-dicyanobutane. The resultant disinfecant is used to disinfect seeds of a variety of crops such as rice plant, wheat or vegetables before seeding and especially it is effective in rice seeds infected with resistant strains of a microorganism causative BAKANAE disease and further it shows a high combatting effect against a fungus causing rice Helminthosporium leaf spot. The ratio of components A to B is suitably 1pt. to 0.2-1.5pt.

Description

DETAILED DESCRIPTION OF THE INVENTION A) Fish J and W Detective 1 The present invention relates to a seed disinfectant for disinfecting seeds of various crops such as rice, wheat, and vegetables before sowing. Therefore, it can be effectively used in the fields of pesticide manufacturing and agriculture and horticulture.

Methyl 1-(n-butylcarbamoyl)-2-penzimitazole carbamate (hereinafter abbreviated as benomyl), which is the active ingredient of the present invention and is represented by the chemical structural formula below. 2-henzimidazole carbamate (hereinafter abbreviated as MB-C), 2-(4-thiazolyl)benzimidazole (hereinafter abbreviated as TBZ) and 1.
2-Bis(3-methoxycarbamoyl-2-thioureido)henzene (hereinafter abbreviated as thiophanate methyl) is used as an agricultural fungicide and as a spray agent to control various diseases of vegetables, fruit trees, and grains. /: A part of t4 is used as a seed disinfectant. ・□ 0=CNHC4H9-n.

Br BBMG NC-CH2CH, -C-CNCH
2Br These drugs are excellent drugs that have a wide spectrum of control activity and are not harmful. These things were explained in the 45th
-19078 Publication (Thiophanate Methyl), No. 190 of “Pesticide Handbook 19 AI 1st Edition” (Japan Plant Protection Association, July 208, 1982)
- pages 191 (benomyl), pages 188-190 (thiophanate methyl), etc.

In addition, the use of a mixture containing one of these as a seed disinfectant has been reported, for example, in Japanese Patent Publication No. 3844-1988 (Benomyl + Polyoxin Group Antibiotics),
3845 (thiophanate methyl + polyoxine group antibiotic), JP 52-130917 (benomyl + procymidone), JP 56-81510 (Kas 7-1598 (thiophanate methyl + T)
MTD) etc. are known (drug names in parentheses are ``
This is the grade name listed in the 1981 edition of the Pesticide Handbook).

On the other hand, 1,2-dibromo-
2,4-dicyanobutane (hereinafter referred to as BBMG) is described in US Pat. This is a drug used as a preservative and anti-mold agent. However, it has not been used as an agricultural seed disinfectant.

口■"Color classification: 1 condition": To LJL So far, as seed disinfectants, benomyl, which is a systemic fungicide,
The use of a mixture consisting of thiophanate methyl or these and TMTDC bis(dimethylthiocarbamoyl) dinulphide] accounts for 99% of the national market share. However, benomyl, thiophanate methyl, and MBC and TBZ, which have similar effects, have been used continuously as AJ agents or seed disinfectants, and as a result, they have been used to cause powdery mildew on cucumbers and gray mold on various vegetables. In addition, drug-resistant bacteria have emerged in rice plants such as baka-nae disease, and we are struggling to find countermeasures. However, the current situation is that there are no effective drugs to replace them. Therefore, in related fields, drug-resistant bacteria have become a major problem in rice cultivation, and various parties have pointed out the need for urgent control measures.

In view of the current situation, the inventors of the present invention are conducting intensive research in order to develop a seed disinfectant that is particularly effective against rice grains infected with rice bacterium resistant bacteria. Layered. As a result, it was found that a two-component mixture prepared by adding BBMG to one selected from benzimidazole compounds benomyl, MBC, TBZ, and thiophanate methyl met the purpose and was extremely effective.

The seed disinfectant of the present invention is particularly effective for disinfecting rice seeds. As a disinfection method, the seed disinfectant of the present invention (especially preferably a hydrating powder) is diluted with water and the rice seeds are immersed in this solution, or the hydrating agent in the form of a powder bundle is directly coated on the rice seeds. The method is preferred. If the seed disinfectant of the present invention is used according to this method, it will not only show a high seed disinfection effect on paddy infected with Inakanae disease, which is susceptible to benomyl, MBC, TBZ, and thiophanate methyl, but also
It has a uniquely high seed disinfection effect on paddy infected with resistant bacteria, where these drugs or existing mixed seed disinfectants containing one of these (e.g. Benomyl and TMTD mixture) do not have a sufficient practical seed disinfection effect. shows. Notably, in BBMGll Germany, Benomyl, MBC, TB
BBMG, benomyl, and MBC have no practical seed disinfection effect on paddy infected with Inabaka Nae fungus, which is susceptible to Z or thiophanate methyl, nor on paddy infected with Inaka Nae fungus, which is resistant to Z or thiophanate methyl. , TBZ or thiophane methyl, it has a specific synergistic effect even on rice grains infected with resistant bacteria, making it possible to completely control rice blight. Become.

In addition, the seed disinfectant of the present invention was also examined for its seed disinfection effect on paddy infected with Sesame leaf blight, which is a major seed-borne pathogen of rice, as well as Inakanae disease, and was found to exhibit an excellent control effect. The effect was exhibited as a synergistic effect that cannot be obtained by using BBMG alone, similar to the effect of the Inabaka Nae disease fungus.

(Part 3 of 2) The seed disinfectant of the present invention can be formulated into a wettable powder, emulsion, flowable, etc. by a conventional method together with the active ingredient, a carrier, and various auxiliary agents. The carrier used is
Solid carriers such as clay, talc, bentonite, kaolin, diatomaceous earth, silica, sucrose, or benzene,
Liquid carriers such as xylene, toluene, kerosene, alcohols (methanol, ethanol, impropatol, n-butanol, etc.), ketones (acetone, methyl ethyl ketone, cyclohexanone, etc.) are used. These can be formulated with appropriate amounts of surfactants and other auxiliary agents, such as stabilizers and spreading agents, for use.

The blending ratio of the active ingredients in the present invention is 1 weight ratio, and it is appropriate to blend 0.2 to 1.5 parts of BBMG to 1 part of benomyl, MBC, TBZ, or thiophanate methyl. . However, the blending ratio can be changed as appropriate depending on the conditions at the time of use. Other fungicides (including seed disinfectants), insecticides, herbicides, plant growth regulators, etc. can also be used in combination.

Next, examples of the present invention will be shown. In the examples, all parts are by weight.

Fruit l Water J) 20 parts of benomyl, 20 parts of BBMG, 1 part of white carbon
5 parts of lauryl sulfate, 2 parts of calcium lignosulfonate, and 40 parts of sucrose are mixed and thoroughly ground to obtain an irrigation agent.

” = 2 (J MBC 20 parts, BBMG 15 parts, White Carbon 15
1 part, 3 parts of polyoxyethylene alkylaryl ether, 2 parts of sodium lignin sulfonate, and 45 parts of clay.
Mix the parts and grind thoroughly to obtain an irrigation agent.

m-3 (15 parts TBZ, 20 parts BBMG, 15 parts white carbon
1 part, 5 parts of polyoxyethylene alkylaryl sulfonate, and 45 parts of diatomaceous earth are mixed and thoroughly pulverized to obtain an irrigation agent.

20 parts of thiophanate methyl, 20 parts of BBMG, 15 parts of white carbon, 3 parts of polyoxyethylene alkylaryl ether, 2 parts of calcium lignosulfonate, and 40 parts of clay are mixed and thoroughly ground to obtain a wettable powder.

Benomyl 15 parts, BBMG 20 parts, White Carbon 1
5 parts, polyoxyethylene alkylaryl ether 2
parts, 2 parts of sodium ligninsulfonate and 4 parts of clay.
Mix 6 parts and thoroughly grind to obtain an irrigation agent.

The hydrating agents of Examples 1 to 5 are diluted 50 to 1000 times with water, and the seeds are added to a sewing solution 1 to 2 times the volume of the seed rice.
Seed parasitic pathogens such as Inakanae disease can be controlled by soaking the rice for 0 to 48 hours or thoroughly coating the seed rice with an irrigation agent equivalent to 0.1 to 1% by weight of the rice seed.

C) Ematari 1 The disease control effect of the seed disinfectant of the present invention will be explained using test examples.

Me 1 throw example 1 ↓ 1 - disease -1
-"- Gibberella fujikuroi) (disinfection by seed dipping method) Town 11 Benomyl-resistant Gibberella fujikuroi and susceptible Gibberella fujikuroi cultured in steam-sterilized rice straw medium
) was made into a spore suspension and sprayed and inoculated to rice (variety: Nipponbare) at the flowering stage twice each to obtain rice grains infected with the Inabaka Nae disease fungus (two types: rice infected with #sexual bacteria and rice infected with susceptible bacteria).

11 Dilution The paddy infected with the rice blight fungus obtained by the above method was added to a diluted crude solution of each chemical solution with a predetermined concentration prepared according to the water use agent of Example 1 at a seed rice to chemical solution ratio (V/V) of 1 to 1. The seeds were soaked in water at 20°C for 3 days at a ratio of 20°C, then budded for 24 hours at 30°C, and then sown at 5 g per area in Kumiai granular culture soil (180 cm per area). After budding treatment at 32°C for 2 days, they were transferred to a glass greenhouse and cultivated.

To investigate the onset of the disease, 30 days after sowing, we investigated the number of diseased bacteria that exhibited symptoms of Inabako Nae Disease such as elongation and withering (the total number of bacteria per plot was 350 on average), and determined the rate of diseased seedlings ( %) was calculated. From this, the seed disinfection rate (%) was calculated in comparison with the diseased seedling rate (%) in the untreated plot, as shown by the following formula. Regarding phytotoxicity, germination rate, growth level, etc. were observed and expressed using the phytotoxicity index below.

Relationship # Phytotoxicity index 0 = No phytotoxicity ■ = Slight 3 - High 2 - Medium 4 = Jinmoto test was conducted with 1 treatment 3 concealment system, average seed disinfection - J (%
) was sought. The results are shown in Table 1.

Human ogihada” 1,1. F deer - 1゛ disease゛ store! Evening in L, 4(j
Disinfection by Seed Powder Coating Method) W 弐ま 1 The rice seeds of Test Example 1 and 2 were used.

According to the practical example ■: Using each of the hydrating agents manufactured by A, put the drained seed rice into a plastic bag after transporting it in water, and place it in a seed rice type 0, 2.
A uniform coating of 5-0.5% drug was applied. This treated form was air-dried indoors for about 3 minutes and then immersed in water at 20° C. for 411 minutes.

Subsequent sowing, sprouting treatment, cultivation management, and disease onset investigation were conducted in the same manner as in Test Example 1. In addition, as in Test Example 1, the degree of chemical damage to rice was investigated. The results are shown in Table 2.

18 Good quality 11 Naturally infected paddy (variety Nipponbare) collected from a field where rice sesame leaf blight frequently occurred was used.

m It was conducted in exactly the same manner as the rice baka seedling disease seed disinfection test in Test Example 1.

Disease onset was investigated 25 days after sowing, and the number of pathogenic bacteria and the number of seedlings showing symptoms of rice sesame leaf blight were determined.

Thereby, the diseased seedling rate (%) was determined, and the seed disinfection rate (%) was calculated in the same manner as Test Example 1. In addition, in the same manner as in Test Example 1, the degree of chemical damage to rice was investigated. The results are shown in Table 3.

Procedural amendment 1980/Rho month 22nd

Claims (1)

[Claims] From methyl 1-(n-butylcarbamoyl)-2-benzimidazole carbamate, methyl 2-benzimidazole carbamate, 2-(4-thiazolyl)benzimidazole and 1,2-bis(3-methoxycarbamoyl-2-thioureido)benzene 1 type selected and 1,
A seed disinfectant comprising a mixture of 2-dibromo-2,4-dicyanobutane and 2-dibromo-2,4-dicyanobutane as an active ingredient.