JPS5933204A - Agricultural and horticultural fungicide - Google Patents

Abstract

PURPOSE:To provide the titled fungicide exhibiting excellent synergistic effect for the control of especially snow rot of wheat, etc., and high controlling effect to blast and sheath blight of rice plant, by using a mixture of toluclofos methyl and thiabendazole, etc. as an active component. CONSTITUTION:The objective fungicide contains, as an active component, a mixture obtained by mixing (A) 1pt.wt. of toluclofos methyl of formula I (O,O- dimethyl O-2,6-dichloro-4-methylphenyl phosphorothioate) which is a soil fungicide effective to damping-off of cucumber and fusarium yellow of radish, etc., having high safety to man, cattle and fish, and giving little residue in the harvested crop with (B) 1-10pts.wt. of thiabendazole of formula II [2-(4-thiazolyl)benzimidazole] or carbendazim of formula III (methyl-2-benzimidazole carbamate) which are known agricultural and horticultural fungicides.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to 0,0-dimethyl 0-2,6-dichloro-4-methylphenylphosphorothioate (hereinafter abbreviated as tolclofos-methyl) and 2-
(4-thiazolyl)benzimidazole (hereinafter abbreviated as thiabendazole) or methyl-2-benzimidazole carbamate (hereinafter abbreviated as carpendazine)
The present invention relates to an agricultural and horticultural fungicide characterized by containing as an active ingredient a 211m mixture of A.

Recently, with the change in Japan's basic business policy of ``reducing the overproduction of rice and increasing the production of other crops,'' a movement to reduce rice paddy acreage has been developed, and crop rotation of wheat, soybeans, etc. is rapidly progressing. ing. However, Hokkaido is a snowy area in winter,
In order to stabilize the cultivation of autumn-sown wheat in the Tohoku region, it is extremely important to control wheat snow rot, a soil-borne disease. In particular, this disease is caused by four diseases caused by different pathogens, namely, crimson snow rot (Fusarium lvale), snow rot large-grained sclerotia
'l'yphu), 'l'yphu
This includes the various diseases caused by the fungicidal fungicides that are effective against these diseases and are highly safe. The reality is that there is not. Therefore, this disease can be controlled at the same time in a labor-saving manner (``The development of current fungicides and control technologies is urgently needed to promote and stabilize the cultivation of wheat in paddy field rotation.

In view of these circumstances, the inventors of the present invention have conducted extensive studies on a large number of drugs through testing, laboratory screening, and field testing. As a result, a new fungicide consisting of tolclofos-methyl combined with the known thiabendazole or carpendazine17 was found to be extremely effective against the various diseases mentioned above.

Tolclofos-methyl, one of the active ingredients of the present invention, is
It is also a soil fungicide (disclosed in Japanese Patent Publication No. 51-20571) and is effective against cucumber seedling damping-off (Rh1zoctoni).
a5olani @ ) and thick root yellowing disease (Fusa-r
iurn oxyaporum f, sp, ra
Phanl bacterium), etc., and is highly safe for humans and fish, and has almost no residue in crops. In addition, Chiabe/Dazol special public service
It is a known agricultural and horticultural fungicide as described in Publication No. 274, "Fly Medicine Handbook 1976 Edition" (October 18, 1976, published by Japan Plant Protection Association), pages 201 and 391. In addition, carpendazine is also
It is known as a horticultural fungicide in Japanese Patent No. 1619.

The present inventors, aiming to develop an effective simultaneous control agent for wheat snow rot caused by the four-bar disease, conducted various studies on the control properties of V tolclofos-methyl for wheat snow rot. As a result, doaclofos-methyl has alkalinizing activity against the above-mentioned large-grained sclerotia fungi, black-grained small-grained fungi, and brown-grained small-grained fungi, and also has control activity against wheat snow rot caused by these fungi. It has been found.

However, it has almost no effect on controlling red snow rot, which is a common disease in snowy areas, and has low practicality as a chemical agent for controlling WG disease in wheat.

The present inventors took advantage of the advantages of tolclofos-methyl [7], supplemented its usefulness, and developed a practical horticultural fungicide by combining tolclofos-methyl with various pesticides. , various studies on the mixed effects 1. Ta.

As a result, as described above, tolclofos-methyl was mixed with 1 portion of thiabendazole or carpendazine.
We have found that the new fungicide is an excellent fungicide that meets the above objectives.The control effect of the fungicide of the present invention is clear from the following test examples. It is extremely effective against wheat snow rot caused by any of the plant pathogenic bacteria, as well as against blast and sheath blight, which are important diseases of rice. The fungicide of the present invention was developed based on the new knowledge as described above.Since the fungicide of the present invention is effective in controlling both of the above-mentioned beach diseases, the amount of immobile components used is smaller than that of ordinary single-use sewing. It is enough to eliminate various diseases with just one drug.15
It is a labor-saving and economical pest control agent because it controls insects at one time, and its practical application is high.

To formulate the four horticultural fungicides of the present invention, add the active ingredient, a starch carrier and various auxiliaries that are normally used in the formulation of traditional medicines, and add powders (including DL type powders), irrigation agents,
It can be used in any desired form such as liquid, flowable, microgranules, granules, and tablets. The blending ratio of the active ingredients in the present invention is 1 to 1 to 1 to 1 to 1 to 1 to 1 to 1 to 1 to 1 to 1 to
Whether it is appropriate to use 0 part of the fungicide in the agricultural and horticultural fungicide of the present invention, the total blending ratio can be changed as appropriate depending on the conditions at the time of application and the occurrence of heat damage. agent,
Contains pesticides, herbicides, etc. 1. It can also be used as

Next, examples of the present invention will be shown.

Example 1 (Irrigation agent) Put 60 parts of tolclofos-methyl (parts by weight, same below), 30 parts of thiabendazole, 5 parts of white carbon, alkylbenzene sulfone mJ:Mss and 30 parts of diatomaceous earth into a ribbon mixer, mix well, and then use an atomizer. - Thoroughly pulverize with a river ribbon miller and mix (2. Obtain a wettable powder with a main grinding content of 60% each).

When using this hydrating powder to control wheat snow 11 disease, it is recommended to use 1.
Dilute 2 to 1,000 to 1,500 times, and use an appropriate spraying device to spread 11 to the wheat during the growing season, before root snow and during snow melting, at a rate of 100 to 1,501 per 10 ares to eliminate various types of snow rot fungi. It is possible to control all diseases individually or simultaneously. Reedamoto 71 (Ill agent is 800 ml with water before the outbreak of rice blast and rice sheath blight, ζ... or after the outbreak)
~1.5 [] Dilute to 1:0 and spray on the complement at a rate of 100 to 1801 per 107 liters using an appropriate tool. irt.

These various diseases can be controlled singly or simultaneously.

Example 2 (Water beating agent) 3 parts of tolclofos methyl, 60 parts of carpendacin, 10 parts of white rubber, 5 parts of lauryl sulfate, 6 parts of sodium ligninsulfonate and 22 parts of diatomaceous earth were prepared in the same manner as in Example 1. A hydrating powder is obtained by mixing. The procedure for using this hydrating powder is the same as in Example 1.

Example 3 (powder) 6 parts of tolclofos methyl, 2 parts of thiabendazole, 5 parts of white carbon, P A P (4i property improver)
0.5 parts of diatomaceous earth and 91.5 parts of diatomaceous earth were put into a ribbon mixer J1 and mixed, and then thoroughly mixed again with the ribbon mixer E2 to obtain a powder f.

This powder can be used with a suitable spraying device, and 3 to 5 particles per 1n are
If applied at a rate of 119 kg to root snow F+fJ and wheat during the growing season during snow melting, it will be possible to control various diseases caused by each M snow rot fungus, either singly or simultaneously. In addition, if this powder is applied at a ratio of 1:3 to 4 yu per 10 ares before or immediately after the outbreak of rice blast and rice sheath blight using an appropriate spraying device, these diseases will be completely eliminated. Or you can control number and J at the same time.

Example 4 (powder) 6 parts of tolclofos methyl, 2 6 parts of carpentacy, 6 parts of white carbon, PAP (:l, 0)
．． 3 parts and 91.7 parts of Moto gravel were mixed and pulverized with the same method as in Example 6 to obtain a powder. Hon R cut 1 military hand 1
11th - Same as fear 1 + i13.

Next, the effects of the present invention's @+ya1 calyx fungicide t, )#u on controlling crop diseases will be explained using test examples.

So, each component is Ni11F per 10 ares, 9°P in 5
20 s f 15 kg, 0%-10
kli'? Diluted fertilizer (2 full layer mixture + lI1.#-, zo L-
On September 15th, the harvest of fall-sown wheat (Horoshiri wheat) was harvested in a 1,130 cm ridge, and the yield was 15 kglm lt per 1 area. How many 7s are there in 3 consecutive editions using the random V method?
-, 3, Test - Each 71C + IJ agent life, lc + (, -r diluted to the specified concentration (/C) 1 (, Buddhism - 1nγ-ru 1') 12
H1-san↑+il/ta.

On April 25th of the I-%ljf meeting, the following Yu disease symptoms were filled^, 1゛After determining the severity of the disease from Wi-Ki, each I'll Trial, -#, 111 control fields (%) were produced (~).

Disease investigation criteria Index Morbidity degree 0 Healthy 1.Less withering is less than half 2　　　　φ deadness is more than 1/2 3. Less than half of stem death 4. More than half of the stems died. ×100 The results are shown in Table 1.

PCP indicates the chemical name pentachlorophenol, and the numbers above 0 indicate the average onset of each snow rot fungus +ll'.

Test Example 2 Rice blast disease field seedling control effect test Dried paddy of rice (variety Zasanishiki) was soaked and disinfected for 48 hours in a 200-fold solution of Benlate T Irrigation Agent 20 (trade name of Miko Disinfectant for Cloth Board) for 48 hours. The soaked rice seeds were sown in rows in the field for seedlings.

Each test area was conducted in triplicate, with 1 nr per area. For chemical spraying, water conserves containing each single active ingredient were diluted with water to double the final spraying concentration, and the drug** was added to the area evenly and sprayed 3 times with a small automatic sprayer at 100 m/area in each area ( The first monthly chemical application was carried out on rice seedlings at the 3.5 leaf stage two days before inoculation with disease bacteria.
The 21st chemical spray was carried out 2 days after the inoculation of the pathogen, and the third chemical spray was carried out 8 days after the second spray). To apply the disease, small pieces of rice blast diseased leaves prepared in advance were uniformly scattered over the entire surface of the test plot, and covered with plastic at night to encourage the onset of rice blast disease.

The disease onset survey was conducted on the 15th day of the third chemical spraying, and the control value was determined using the following formula.

× 100 2nd Cloth IBP#-t, chemical name S-benzyl 0,0-diiso Test Example 3 Rice sheath blight control effect test Yuzu sterilization (7 Tasao and (Shinran Koshihikari)) in the same manner as Test Example 2 Raise seedlings in boxes according to the general line (July, June 1)
On the 5th, the seedlings were mechanically transplanted (to 1 (cultivation density 1 is also 5oα x 15 side)). , Takuyaki phosphorus cake - 10 kg, and additional fertilizer and 1. NK Kasei (17-0-
17) was applied to f/CI7 on July 18th at 9'jr- [7
Ta. Test 1: 15m's 15m's triple series of Rankonpo and [7.

Chemical spraying was carried out in the same manner as in Test Example 2, using VC1 and Pulley II7.
On the 6th), you will receive 10 coins per time using the automatic 1 prize fog period.
1501 particles were distributed per area.

The disease onset survey was conducted in September 151, and the disease severity was determined for 50 plants in one district using the survey criteria for each disease index listed in the table below. Calculated 1.

Intensity of rice sheath blight disease (Kunshoku Sei) Disease index 4: Highly affected leaves in 1 plant 3) Plants with flag leaf blight reaching 1 ~ in 1st place: Broad leaves
・2: Third leaf ・1: Fourth leaf 〃0:
5th leaf ・The results are shown in Table 6.

Table 3 The threshold values for infestation in Table 0 indicate the average rice sheath blight onset rate for undefeated configurations.

Claims (1)

[Claims] 0.0-dimethylO-2,6-dichloro-4-methylphenylphosphorothiony),! : A boxcide for rice gardening characterized by containing as an active ingredient a mixture of 2-(4-thiazolyl)benzimidazole or methyl-2-benzimidazole carbamate.