JPS5890505A - Fungicidal composition for agricultural and horticultural use - Google Patents

Abstract

PURPOSE:To prepare a composition effective to rice blight, by using a mixture of O-ethyl-O,O-di(2,4-dichlorophenyl)phosphate and 4,4'-O-phenylenebis(3-thioallophanic acid) dimethyl ester as active components. CONSTITUTION:The titled composition contains O-ethyl-O,O-di(2,4-dichlorophenyl)- phosphate (phosdiphen) and 4,4'-O-phenylenebis(3-thioallophanic acid) dimethyl ester (thiophanate methyl) at a weight ratio of 1:1-5. The combination of phosdiphen with thiophanate methyl gives a composition having synergistic controlling effect to the ear-withering blight of rice while keeping the advantages of phosdiphen such as remarkable controlling effect to rice blast, residual activity and rain resistance on the leaves of rice, etc.

Description

Detailed Description of the Invention The present product 1111 is composed of O-nibble 0,0-di(2,4-dichloro7enyl) sulfate (hereinafter referred to as Trphosdaifene) and 4,4'-0-phenylenebis Regarding a certain chemical pesticide characterized by containing a mixture of dimethyl (3-thioallophanate) (hereinafter referred to as "thiophanate methyl") as an active ingredient.

In particular, the present invention provides a novel composition that exhibits remarkable synergism in eliminating rice blast and rice panicle blight.

In recent years, as rice cultivation methods have become more labor-saving and mechanical oak seedlings have become widespread throughout the country, major changes have occurred in the occurrence of rice and rice diseases. In particular, the period during which rice is exposed to high temperatures during ripening has become longer than ever.

At the same time as rice blast disease, rice ear blight diseases caused by invasions such as rice sesame seed blight and rice row blight are occurring frequently. However, there are few fungicides that are effective against these diseases.

Therefore, there is an urgent need to develop new pesticides and control techniques that can simultaneously control these diseases in a labor-saving manner.

In view of these circumstances, the present inventors have developed a large number of lIl#
I tested it and studied it extensively. As a result, it was found that the combination of thiophanate methyl with phosdaifen was effective against the above-mentioned diseases.

Phosdaifen, one of the active ingredients of the present invention, is already known in Japanese Patent Publication No. 46-20514 as a rice blast disease slimming agent, and has extremely low toxicity to humans, livestock, and fish, and has been shown to be effective against rice blast disease. It is a safe drug with no anti-inflammatory properties.

The present inventors have recently conducted various studies on the control properties of phosdaifen against rice diseases. As a result, 1# Sudaifen has a remarkable effect on preventing the invasion of parasites of rice blast disease.
In addition, it not only has excellent residual efficacy and rain resistance in rice soil collection, but also shows antibacterial properties against the pathogenic bacteria of the one-head sticky disease mentioned above.
It was found that there is no 4 cross-resistance and that the method is effective against 0-diisoprobyl phosphorode 21) (IBP)-resistant blast fungi.

However, the effect of fosdai-7en on controlling rice blast disease is mostly limited to preventive spraying of infected rice fields.

The efficacy of treating rice blast after infection is low. In addition, the reality is that the use of phosdaiene as a single agent cannot necessarily be expected to have an economical practical effect on rice panicle blight, which has recently become a problem.

In view of these circumstances, the present inventors tested a mixture of phosdaifen and various drugs in order to develop a practical 5ml 1t fungicide that took advantage of the advantages of phosdaifen while supplementing its shortcomings. .

As a result, it was found that a novel composition containing 20 parts of phosdaifene and thiophanate methyl met the above objectives.

As clarified in the following test examples, the agricultural and horticultural fungicidal composition of the present invention has a synergistic effect on rice blast and rice panicle blight compared to the use of each agent alone.

The present invention was made based on these findings,
It is highly practical as a control agent for various rice diseases, especially rice blast and rice panicle blight, which has recently become a problem.

K is used to formulate the sterilizing composition for agricultural purposes of the present invention.

Powders (including DLIII powder) are made by adding active ingredients and various carriers and various adjuvants used in conventional methods.

It can be used in any desired form such as wettable powders, liquids, flowables, microgranules, one granule, one tablet, etc.

The blending ratio of the active ingredients in the present invention is expressed by weight.

1 part of thisuphanate methyl for 7 parts of phosdai
It is appropriate to mix 5 parts to 5 parts, but the mixing ratio can be changed as appropriate depending on the conditions at the time of application and the situation of disease occurrence. In addition, other fungicides, insecticides, leather removers, etc. can be added to the agricultural and horticultural fungicidal composition of the present invention.

Next, examples of the present invention will be shown.

Implementation 11] (Irrigation agent) 20 parts of phosdaifen (parts by weight: same below).

20 parts of titanate methyl, 16 parts of white carbon, 9'19 rufaate 511S,! j Put 124 parts of geninsulfone and 36 parts of clay into a ribbon 2 mixer, mix well, and then thoroughly crush with an atomizer.
The mixture was mixed again using a ribbon 2 mixer to obtain an irrigation agent.

This hydration shaving is diluted 800 to 1,000 times with water before or immediately after the outbreak of rice blast disease and rice panicle blight, and applied with an appropriate spraying device to 300 to 1 Ro per KIO area on the panicle.
By spraying at a rate of 1.5 t, these various diseases can be controlled individually or at the same time.

Example z (lljil) 2 parts of Ho-lambda 7ene, 2 parts of thiophanate methyl, 2 parts of white carbon, 0.3 parts of P-P (physical property improvement cutting) and 93.7 parts of clay were mixed in a ribbon 2 mixer. After thoroughly pulverizing the mixture using an atomizer, the mixture was thoroughly mixed again using a ribbon miller to obtain a powder.

Sprinkle 1 part of this powder onto the cane using an appropriate spraying device.
By spraying at a rate of 3 to 4 per IO area, rice blast and rice ear blight can be controlled singly or simultaneously.

Next, the disease control effect of the agricultural and horticultural fungicidal composition of the present invention will be explained using test examples.

Test Example 1 Rice blast disease control effect test (Hata Moeyo) Rice (
Variety: Sasanishi? ) dried paddy with benlate T hydrating agent 2
The rice seeds were immersed in a 20 times solution of 0 (trade name of a commercially available toothpick disinfectant) for 10 minutes to be sterilized, and then the rice seeds were immersed and germinated in a conventional manner and were sown in rows in the field. Each test area was conducted in duplicate with 1 tfl per area. For chemical spraying, an aqueous phase agent containing 6 active ingredients was mixed with water twice as much as the final spraying solution, and equal amounts thereof were added to make 14 #l. Then, add this mixture to each area.
Addressed to 00IIJ, sprayed twice with a small automatic sprayer (1st
The second spraying was done in July 6th when the first lesions appeared on the lower s#C Mie.
day, the 2nd spraying was on July 14th).

Disease onset was investigated 16 days after the second chemical spraying, and the percentage of rice blast lesions and blight and wilt (91) was investigated, and each sample II
Calculate the control value of M (@ fC0) Also, in the present invention, whether or not there is synergy by mixing two types of chemicals is determined by calculating the expected value (Pisl) of the mixture using the following formula and calculating the actual value (PC
The presence or absence of a synergistic effect was determined from the relationship with :$).

P M (d=-Pa÷Pb (100-Pa)/]
OO In this formula, Pg indicates the control value of Mitsubuchi (119) by using phosdaifen, and Pb indicates the control value (-) by using tit7anatemethyl. Judgment is based on the following criteria.

PC) Pli! : Synergistic effect Additional effects of PC-Pis PC (Pit! Antagonistic effect) the result! ! It is as shown in Table 1.

Notes to Table 1 1) IBP indicates the chemical name S-benzyl o,o-diisoglobyl phosphorothioate.

Note 2) The numbers in parentheses indicate the average rice blast disease spot dead area ratio (qa). - Test Ga 2 Rice blast control effect test (field seedling cost) Conducted in the same manner as Test Example 1 except for the following matters. .

That is, in the 0-plant test, rice (variety: Susanishiki) was sown on July 8th, and the cutting and spraying was carried out twice on July 20th and 27th. In order to find out the usefulness of the medicinal bactericidal composition, both kasugamycin-susceptible and resistant kasugamycin-resistant strains were used for rice blast II, which were monospore-isolated from diseased dandelions in the Shonai area of Yamagata Prefecture in 1972.

These 2-sodium-like inoculum spores are fresh spores that have passed through rice seedlings (rice seedlings sown thickly in a plant vat), and are prepared in a spore suspension containing a 3:7 mixture of kasugamycin-susceptible and resistant spores. (Spore-based lymphatic microscope @l
]jsG times approximately 120 pieces per visual tt).

Vaccination will be done twice: 2 days before the first chemical spraying and 2 days after the first chemical spraying, with 1 liter of 20M water per area! 1 type,
The onset of the disease was promoted by drinking vinyl at night.

In the disease onset investigation, 15 days after the second chemical spraying (the final spraying), the proportion of dead area of rice blast lesions was investigated, and the control value (-) was calculated using the calculation formula shown in Test Example 1.The results were # !It is as shown in Table 2.

Note to Table 2]) BDDPtj, Shi? tlJnllO-xf
8,8-diphenyl. ([Same in 3 tables)
Note 2) Numbers within 0 indicate average rice blast disease spot dead area percentage (-).

Test Example 3 Rice panicle blight control effect test (li field) test w
Benley) T hydrating agent 2o in the same manner as in Example 1 [IW
4. Mechanical transplantation of leaf stage seedlings (S315) of rice (varieties: Nipponbare and Reihoku) which were poisoned and grown in boxes according to the general practice method.
day, the culture density f30cRx14al)L.

The amount of fertilizer applied by Honda (basic fertilizer) was 0 ar, and ammonium sulfide phosphorus was applied per 3 to 3 to #1.

The test plots were 3 consecutive plots with each section 15 m long. Same as Test Example 1.
1Klljlt, and each test drug was used at the earing stage (August 20th).
and twice during the milk ripening period (September 6), using a backpack-type power misting machine, we distributed 12,011j per 10 ares. Control powder M
A hand-cranked duster was used for the shawl, and the powder was spread at 3 times per 10 acres.

On September 28th, 30 plants in each area were investigated for rice sesame leaf blight using Fence Blight nk Tohin Hashi Nipponbare, and as in Test Example 1, the control value of each chemical (@ I asked for

N: Total number of investigated ears.

A: The oak neck is damaged and the entire panicle is dead. B: The head of the panicle, cob, or ramus is damaged and more than half of the panicle is dead.

C: The cob or ramus is damaged, and one-half or less of the panicle is dead.

The results are shown in Table 3.

Note 3: MZ is a zinc, maneb complex compound (DI-1han
eM-45).

Note 2) The numbers in (-) indicate the average severity of rice ear blight caused by each disease.

Patent applicant: Hokuin Chemical Industry Co., Ltd.

Claims (1)

[Claims] 〇-Ethyl 0.0-di(2,4-dichlorophel)phos 7-ether) 4.4'-0-phenylenebis(3-tet
A sterilizing composition for jewelry, characterized in that it contains a mixture of dimethyl (alloan chain) as an active ingredient.