JPS5899404A - Agricultural and gardening herbicide for soil blight - Google Patents

Abstract

PURPOSE:The titled herbicide showing improved controlling effect on soil blights such as damping-off of rice plant, etc., having less phytotoxicity than the individual use of active ingredients, obtained by blending diisopropyl-1,3-dithiolan- 2-indenemalonate with another compound to give the active ingredients. CONSTITUTION:Diisopropyl-1,3-dithiolan-2-indenemalonate showing excellent effect on blast of rice plant and stuffy seeding occurring in a seeding box of rice plant is blended with 3-hydroxy-5-methyl-isoxazole having a wide antifungal spectrum, effective against soil blights occuring in the seeding box of rice plant, caused by fungi belonging to the genus Fusarium, Pythium, etc. in a weight ration of (100:1)-(5:1), to give active ingredients. A carrier, auxiliary, etc. are added to the compounds, and prepared into dust, emulsion, etc. and used. The concentration of the herbicide in use of application is >=0.01wt% calculated as the active ingredients in case of emulsion, etc., and >=500g/10 a in case of dust, etc.

Description

Detailed Description of the Invention The present invention comprises diisopropyl-1,6-sithiolan-2-ylidenemalonate (hereinafter referred to as compound A) and 6-hydroxy-5-methyl-isoxazole (hereinafter referred to as compound B). This invention relates to a soil disease control agent for agriculture and horticulture, which is characterized by containing it as an active ingredient.

Compound A is a known compound described in the specification of Japanese Patent Publication No. 47-34126 and is mainly effective against rice blast disease, but is also effective against stuffy seedlings that occur in rice seedling boxes. It also shows weak activity against soil pathogens such as Rhizopus, Trichoderma, Fusarium, and Pythium.The compound is a known compound described in the specification of Japanese Patent Publication No. 45-38273, and has an antibacterial spectrum. Although it is widely effective against soil diseases caused by Fusarium and Pythium bacteria that occur in rice seedling boxes, it is sometimes not effective enough to control seedling damping off caused by Rhizopus bacteria and Diphtonia bacteria. You may not be able to get it.

As a result of repeated research in order to develop agents that can accurately control various soil diseases, the present inventors have developed compounds A and B.
By mixing -C, it is possible to accurately control soil diseases such as rice seedling blight and rice fungal disease without causing -C chemical damage to crops. The present invention was completed by discovering a synergistic effect against rice seedling damping-off that was unexpected from each single agent.

In order to produce a soil disease control agent containing Compound A and Compound B as active ingredients, both components are mixed with a carrier (diluent) according to the usual method for thigh-raku formulations (-1, optionally desired adjuvants, For example, the present invention may be prepared by adding a surfactant, a dispersant, a fixing agent, etc., into a form convenient for use, such as a powder, an emulsion, a flowable, a tablet, a wettable powder, a fine granule, a granule, etc. is based on the fact that the combined use of Compound A and Compound B is highly effective in controlling soil diseases.
A mode in which Compound A and Compound B are prepared as independent preparations and are mixed together during use is also within the scope of the present invention, although the blending ratio of Compound A and Compound B can be adjusted as necessary. , 100:1 to 5:1.

In the case of powders or granules, it is usually 0.5 to 20% (mold part),
Further, when used as an emulsion or an aquarium, 10 to 50% (by weight) is appropriate.

The present invention includes embodiments in which it is applied prophylactically or therapeutically to the above-ground parts of the crop to be protected or via the soil.

The amount of the pest control agent of the present invention to be used varies depending on various factors such as the degree of damage, tendency of occurrence, weather, environmental conditions, dosage form, etc. For example, when ultimately used in liquid form, such as in emulsions and aquariums, the final concentration of the active ingredient is generally 0.01%.
(1) It may be prepared as follows.

When used as is, such as a powder or granule, it is sufficient to spray 5,009 or more particles per 10 ares as the active ingredient.

It is also possible to expand the scope of application of the present rule by blending the pesticidal agent of the present invention with other herbicides, insecticides, soil disease control agents, fungicides, fertilizers, etc.

Next, some examples will be listed, but the present invention is not limited to these examples. Note that "parts" indicate parts by weight.

Example 1 Compound A 4 parts Compound B O
, Part 1 white carbon
1st part clay
94.6 parts were uniformly mixed and pulverized to form a powder.

Example 2 IL compound A 2S
Part compound B
o, 5 parts xylene
595 parts polyoxyethylene alkyl allyl needle
Mix and dissolve all 15 parts uniformly to form an emulsion.

Example 3 Compound A 24
Part compound B
Q, Part 4 White Carbon
20 parts Sodium dodecylbenzenesulfonate
5th part clay
50.6 parts were uniformly mixed and pulverized to make an irrigation agent.

Example 4 Compound A b
Part compound B
O,S polyvinyl alcohol
Part 2 white carbon
5815 Sodium dodecylbenzenesulfonate
07 part clay 7
87 parts Mix and crush all parts, add 18 parts of water and mix.
Granules are granulated and dried using an extrusion granulator.

Test examples of the present invention are shown below.

Test example Rice seedling damping-off control test
tonia aolani) l type A bacteria, Rhizopus (Rhizopus 5pp) bacteria or Trichoderma
A predetermined amount of the wheat bran soil medium 2009 in which Trichoderma viride was cultured and the powder of the present invention stiffened in the same manner as in Example 1 were added to the seedlings at ±2000°C.
Mix evenly with 9, length 60cm, width 30m, depth 6cr
Packed into a nursery box of n. Furthermore, 200 g of germinated rice (variety Nihonbare) eJe was sown per box and germinated in a sprouting device (30° C.).

W! Six days after Enoki, the plants were treated at low temperature (15°C) for 6 days to promote disease onset, and the seedlings were grown in a greenhouse.

Fourteen days after sowing, the rate of seedling stand-off (number of stand-off bacteria ÷ number of seedlings investigated) was investigated. The test was conducted in duplicate.

The results are shown in the table below.

Claims (1)

[Claims] A soil disease control agent for noble horticulture, characterized by containing diisopropyl-1,3-diteofun-2-ylidene malonate and 6-hydroxy-5-methyl-isoxazole as active ingredients.