JPH0232003A - Disinfectant of seed - Google Patents

Abstract

PURPOSE:To obtain a disinfectant of seed especially effective against Gibberella fujikuroi of bakane having resistant to benomyl, showing high controlling effects especially on harmful pathogenic fungi of rice plant and a wide antifungal spectrum by combining benomyl with pyrifenox. CONSTITUTION:A disinfectant of seed containing benomyl, namely methyl 1-(butylcarbamoyl)-2-benzimidazolecarbamate and pyrifenox, namely 2',4'- dichloro-2-(3-pyridyl)-acetophenone-0-methyloxime (preferably ratio of 1 pt.wt. benomyl and 0.1-1.5 pt.wt. pyrifenox) as active ingredients. This disinfectant is effective against Gibberella fujikuroi of bakane, Piricularia oryzae of blast, Cochliobolus miyabeanus of helminthosporium leaf spot, Cercospora kikuchii of purple speck of soybean, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a seed disinfectant for the agricultural and horticultural fields. It is particularly useful as a seed disinfectant that controls harmful plant pathogens that occur during rice seedling-raising and causes disease, and is highly effective in raising healthy seedlings.

<Prior Art> Conventionally, benomyl agents, thiophanate methyl agents, thiuram agents, trifumisol agents, or mixtures thereof have been used as fungicides for controlling seed-borne diseases. In particular, benomyl, one of the active ingredients of the present invention,
It is a well-known compound that is well known as a seed disinfectant and has been widely used for many years either alone or as a mixture with other active ingredients.

On the other hand, another active ingredient, pyrifenox,
This compound was developed as an agricultural fungicide and is highly effective against plant diseases such as powdery mildew and scabies on apples and pears, powdery mildew on grapes and cucumbers, and powdery mildew and scabies on roses. However, no attempt has been made to mix Benomyl and Birifenox and use this as a seed disinfectant.

<Problems to be solved by the invention> With the recent progress in agricultural mechanization, the necessity of disinfecting seeds in rice cultivation has increased, and the decline in control effectiveness due to the emergence of resistant bacteria to existing drugs has become an increasing problem. ing. In particular, the emergence of resistant bacteria is remarkable for rice blight and rice blast, making it difficult to control them sufficiently with conventional drugs.

In order to improve this situation, the inventors conducted research to improve seed disinfectants and found that methyl 1-(butylcarbamoyl)-2-benzimidazole carbamate (benomyl) and - 214'-cyclo2-(3-pyridyl)
It has been found that a seed disinfectant containing -acetophenone O-methyloxime (Birifenox) as an active ingredient is excellent. In particular, it has been found that it has an outstanding disinfecting effect against resistant bacteria such as baka-nae disease of rice, rice blast disease, and sesame leaf blight. In other words, benomyl alone is naturally ineffective against these disease-resistant bacteria, and while pyrifuenox alone is insufficiently effective, when used in combination, it has a remarkable synergistic bactericidal effect. It has an effect.

The composition of the present invention contains these two compounds as essential components, but when used as a seed disinfectant, it usually contains a carrier and formulation auxiliaries, such as a surfactant, a thickener, and a stabilizer. It is used as a preparation containing drugs, etc.

Examples of carriers for the above formulations include kaolin clay attapulgite clay talc, calcium carbonate, diatomaceous earth, acid clay, saccharose, and white carbon.

Surfactants used for dispersion, wetting, etc.
Anionic surfactants such as alkyl sulfate salts, alkylaryl sulfonates, dialkyl sulfosuccinates, naphthalene sulfonic acid formalin condensates, nonionic interfaces such as polyoxyethylene alkyl ethers, polyoxyethylene alkyl allyl ether sorbitan fatty acid esters, etc. Examples include activators and the like.

Thickeners include sodium polyacrylate, polyvinyl alcohol, gum arabic, CMC (carboxymethylcellulose), and stabilizers include various inorganic salts.

The appropriate blending ratio of benomyl and bilifenox as active ingredients in the preparation is usually 0.1 to 1.5 parts of bilifenox to 1 part of benomyl, and a total of 10 parts of these active ingredients. Formulations containing ~50% are preferred. When the seed disinfectant of the present invention is used for seed dressing treatment, the amount used is usually 0.1 to 5 % of the dry seed weight as the amount of the preparation.
% is appropriate, and in the case of immersion treatment, it is preferable to use the preparation of the present invention as a suspension, usually diluted 10 to 500 times.

The seed disinfectant of the present invention can be used not only against the above-mentioned rice diseases, especially resistant bacteria, but also against powdery mildew, downy mildew, rust, scab, and vine wart on vegetables, fruit trees, and cereals. I can do it.

<Effects of the Invention> The seed disinfectant of the present invention exhibits a high control effect particularly against harmful pathogens of rice, has a broad antibacterial spectrum, and is effective against bakanae disease-resistant bacteria that have developed resistance to conventional drugs, especially benomyl. shows stable effects on

The seed disinfectant of the present invention is effective against harmful rice pathogens such as Gibberella fuji.
-kuroi), as well as the blast fungus (pyricula
ria oryzae), sesame leaf blight fungus (Cochi
Examples include Cercospora kikuchii (Obolus mlyabeanus) and Cercospora kikuchii.

<Example> The present invention will be explained below with reference to Examples.

Formulation Example Formulation Example 1: Benomyl drug substance 20 parts Biliphenox drug substance 10 parts Sodium lauryl sulfate 3
Part naphthalene sulfonic acid formalin condensate 3
part white carbon
Part 5 kaolin clay
59 parts were sufficiently mixed and ground to obtain an irrigation agent.

Formulation example 2: Benomyl drug substance 50
Biliphenox active substance 5
Sodium lauryl sulfate
3-part calcium lignin sulfonate
Part 5 white carbon
2 parts diatomaceous earth
10 parts of kaolin clay were thoroughly mixed and ground to obtain a water solvent.

Formulation Example 3: Benomyl raw material Pyrifenox raw material Sodium dodecylbenzenesulfonate Naphthalenesulfonic acid formalin condensate White carbon kaolin clay was thoroughly mixed and ground to obtain an aquarium.

Formulation example 4: Benomyl drug substance biliphenox drug substance white carbon attapulgite clay calcium carbonate The mixture was thoroughly mixed and ground to obtain a powder.

Formulation example 5: Benomyl drug substance Pyrifenox drug substance 25 parts 20 parts 30 parts 5 parts 3 parts 20 parts 22 parts 10 parts 10 parts 5 parts 35 parts 40 parts 10 parts 5 parts White carbon 3 parts
Department Merck 32
Kaolin clay 50
The mixture was thoroughly mixed and ground to obtain a powder.

Formulation Example 6: Benomyl drug substance 20 parts Biliphenox drug substance 5 parts Naphthalenesulfonic acid formalin condensate 7 parts White carbon 5 parts
Part xanthan gum 0
．． 5 parts water
After thoroughly mixing 62.5 parts, wet pulverization was performed to obtain a sol.

Test Examples Test Example 1: Effect of controlling rice blight (Qibberella) resistant to benomyl
rice grains (variety Nihonbare) contaminated with P. fujikuroi) were added to diluted solutions of the hydrating agent of the present invention, benomyl hydrating agent, and pyrifuenox permanant prepared according to Formulation Example 1.2.3. After soaking for a specified period of time, germinate the seeds using a Punstick seedling box (60x30x3cm).
) was sown.

After cultivating the plants in a greenhouse for 20 days, the disease state was investigated and the plants were determined to be healthy.

The results are shown in Table 1.

Single-use area Benomyl Rubiriphenox Invention diagram Benomyl + Biliphenox 500+ 50 500+250 Test Example Il: Rice blast control effect Rice blast fungus (pyricularia oryza)
Wettable powders of the present invention, benomyl wettable powders, and pyrifenox water concentrators prepared from rice paddy (variety: Koshihikari) contaminated with e) according to Formulation Examples 1 and 2.3, as well as thiuram benomyl as a control. After soaking in the diluted solution of the irrigation agent for a predetermined period of time, the water was drained and air-dried for 6 hours. This seed rice was placed on the surface of a filter paper in a Petri dish, set in a room at 25°C, and two days later, spore-forming grains were examined using a dissecting microscope with a magnification of 60 to determine the healthy grain weight.

The results are shown in Table 2.

Untreated area Table 2 Single use area Benomyl Pyrifhenox Invention area Benomyl + 250+ Birifenox 250+ 250 Control area Thiuram Benomyl 1. OOO+1.000
99 Untreated area Test Example N: Rice sesame leaf blight control effect Rice sesame leaf blight disease tooth (Cochiobulus, mlya
Beanus)-contaminated rice paddy (variety: Koshihikari) was added to the diluted solutions of the water-use agent of the present invention, benomyl water-use agent, and pyrifenox water-dispersible powder prepared simply in Formulation Example 1.2.3, respectively. After soaking for a period of time, the seeds were germinated and sown in plastic seedling boxes (60 x 30 x 3 cm). After cultivating the plants in a greenhouse for 20 days, the disease state was investigated and healthy plants were determined.

The results are shown in Table 3.

Table 3 Single-use area Penomyl 750 $ 70 Invention area Benomyl + 500 + 50 Pyrifenox 500 + 250 Untreated area Test example ■: Effect on controlling soybean purpura (Cercospora kikuch)
ii) The water-use agent of the present invention, benomyl water-use agent, and pyrifenox water-use powder prepared from soybean seeds (variety: Leiden) contaminated with After each was immersed in a diluted solution of the agent for a predetermined period of time, the seeds were sown in the field, and after cultivation, the purplish grains were examined and the percentage of healthy powder was determined.

The results are shown in Table 4.

Table 4 single-use area benomyl Pyrifenox invention area Benomyl + Pyrifenox control area Thiuram benomyl Untreated area 500+ 50 500+, 250 500 + 750 1, OOO+1.000

Claims (1)

[Claims] Methyl 1-(butylcarbamoyl)-2-benzimidazole carbamate and 2',4'-dichloro-2-(
A seed disinfectant characterized by containing 3-pyridyl)-acetophenone 0-methyloxime as an active ingredient.