JPS5824505A - Insecticidal composition - Google Patents

Abstract

PURPOSE:An insecticidal composition, containing a specific oxadiazoline compound and a specific organophosphorus compound, having remarkably improved insecticidal effects by the synergistic effect thereof, and effective for insects, e.g. brown planthopper or rice stem borer. CONSTITUTION:An insecticidal composition containing 2-methoxy-4-(2-methoxyphenyl)-1,3,4-oxadiazolin-5-one and an organophosphorus compound having a dialkylthio or dialkyloxy group, e.g. S,S,S-tributyl phosphorothioate, at a weight ratio of preferably 1:(0.5-2). The resultant composition exhibits excellent insecticidal effects particularly on planthoppers.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insecticide composition containing a specific oxadiazoline compound and a specific organophosphorus compound.

It is well known that oxadiazoline compounds have insecticidal, acaricidal, and nematocidal effects (Japanese Patent Application Laid-Open No. 2003-109003-10/91/
It is also known that 2-methoxy-tei-(J-methoxyphenyl)-i, s, q-okinasiazolin-3-one has a high insecticidal effect against leafhopper, which is a pest in rice cultivation. (Japanese Unexamined Patent Publication No. Shoj-!ritOS).

However, according to the studies of the present inventors.

1-methoxy-ter(co-methoxyphenyl)-/, j
, Tei - Oxadiazoline -! In particular, the insecticidal effect of on planthoppers against planthoppers such as brown planthoppers, white-legged planthoppers, and brown-bottomed planthoppers was still insufficient.The inventors of the present invention, after careful consideration and consideration of these points, found that
Comethoxyw-(J-methoxyphenyl)-i,
3. *-Oxadiazoline-5- was learned and completed in one batch.

That is, the gist of the present invention is comethoxytei-(comethoxyphenyl)-/, J, 41-oxadiazoline-! An insecticide composition characterized by containing an organophosphorus compound having -one and a dialkylthio group or a dialkyloxy group.

The first component of the insecticide composition of the present invention (hereinafter referred to as "the composition of the present invention") is J-methoxy-tei-(J-methoxyphenyl)-'eJ*deroxa. Diazoline! -on (hereinafter referred to as "compound")
As mentioned above, it has an insecticidal effect.

The second component of the composition of the present invention is an organic phosphorus compound having a dialkylthio group or a dialkyloxy group, and various known compounds can be used. For example, 8,1.1-) lyoate (xKatsu F), $-(methylthio)phenyl dibu-vinyl phosphate (Pr@
pak*s), 0/monoether 8.8-diglopyr phosphor ditheoate,
Reference a) phenyl dipropyl phosphate), I,
II-di-1-propyl N-1-propyl phospho-
Amidodithionate (I), 8.8-Propyl N-n-propyl phosphoro-2-dothioate alkyl 8.11-Propyl N-m-propyl Phosphoramide trithiony) [), S, S-di-1-butyl N-1-propyl phosphoroamide trithioate (t), 0.0-di-1-butyl do n-
Examples include tetrapyl phosphotetraamidate, 0.0-di-1-butyl N-propyl phosphoroa 2-dothioate, and the like. Preferably DIF, II? , Propmph
@s I I s I s I and ■, particularly preferably DIF, IIIP and Propaph*-.

Although the first component of the composition of the present invention alone exhibits a certain degree of insecticidal effect on Cape Planthopper II, it is still insufficient.

It was. The degree of the insecticidal effect of the third component varies depending on the compound, ranging from almost no insecticidal effect to some degree of insecticidal effect, but it is not sufficient to use it alone. It cannot be said that it has an insecticidal effect. However, these 1 and 2 effects have been observed.Such a synergistic effect of the composition of the present invention is caused by the brown planthopper, brown planthopper,
White-winged planthopper, Cape hopper, and others.
This is particularly true for insects such as the Japanese beetle weevil and the red bean weevil.
As shown in the Comparative Example below, the composition of the present invention did not show any competitive effect on two spider mites. About Jin 1
The effect of the composition of the present invention appears to be a phenomenon unique to insects.

In the v41ili1 composition of the present invention, the above-mentioned first component and the ratio of the first component to be used are usually a to 1 weight gK of the first component! Parts by weight, preferably a! ~- parts by weight.

In addition to the first component and the first component, the composition of the present invention includes:
It may contain various known additives such as liquid penetrants such as acetone and methyl alcohol.

The form of use of the composition of the present invention is not particularly limited, but it is usually used in the form of an emulsion, a powder, an aqueous solution, a granule, etc.
Ru. In particular, the application amount of the composition of the present invention, which is preferably used in the form of an emulsion or a powder, varies depending on the form of use;
Usually, the active ingredient is 20~00f//Da, preferably #i! 0~/ko7710m may also be selected. In particular, it is selected from the range of j0 to 10f/10* for emulsions and from 60 to /J011/10* for powders.

The composition of the present invention thus obtained is extremely effective against insects, especially planthoppers, which are important pests in rice cultivation.
The present invention will be explained in more detail below with reference to examples.

Formulation Example 1 Compound Muji7da was dissolved in acetone j-, 100 ppm liquid De3- of 1Tsurpol "soo! *t-obtained.

Formulation Example Compound A10 da and DIFlolip in acetone js
Dissolve gK, and joopv of Tsurpol JOOIX to n
Add J00 ppm solution of Compound M and f) CF composition solution (mixing ratio /:/).
11 parts in a mortar and pulverized uniformly to obtain an average particle size of approximately 3.
A powder of 0μ was obtained.

Example 1 Ten entangled larvae of brown planthopper, diameter JG, height/
Place the rice seedlings in a 1cI11 glass cylinder and cover with a mesh wire mesh. Next, prepare according to Formulation Example 1 or 1 inside the glass cylinder *i! A chemical solution (2!rdlt-) containing the components shown in / was sprayed, and the O insect mortality rate was measured after J# hours. This test was repeated IJ times, and the average mortality rate is shown in Table /.

Table 1 Example of entangled larvae of Konica Meichu! The head was immersed for 30 seconds in a chemical solution prepared in Formulation Example 1 and containing the ingredients shown in Table 2. The larvae were immersed in the same chemical solution as above for 1 minute, and then the air-dried rice sprouts were placed in a petri dish (diameter: 1 Jcts, height: 1 Jcts) containing about 100 ml of rice, and the mortality rate was measured after the soaking time. did. This test was repeated t times, and the average mortality rate is shown in Table JK.

Table 1 Example 3 Adzuki bean weevil adult 1084 was grown in diameter J1? Place it in a glass cylinder with a height of /33. A drug solution Q containing the ingredients shown in Table 7 was prepared according to Preparation Example 1 and 9, and was then placed inside a glass cylinder with a lid made of mesh gold steel. −
was sprayed, and the mortality rate was measured after a period of time. This test
-- times and the average mortality rate is shown in Table 3.

Table 3 Comparative Example 1 Approximately 30 two-spotted spider mites inoculated onto green bean leaves were immersed with the leaves for Ky seconds in a chemical solution prepared according to Formulation Example/1fI-2 and containing the ingredients shown in the table below. After soaking, the specimen was placed in a test tube containing water to prevent it from withering, and the survival rate was measured by observing the specimen for 1 m under a VKK stereomicroscope for 2 hours. This test was repeated once, and the average mortality rate was expressed as fJa.

Example-tei 10 female adult brown planthoppers, diameter J3.

Place the rice seedlings at the 3-leaf stage in a gilt bronze cylinder (20 mesh) with a height of 7 cm, and then add 200 mesh powder (20 mesh) prepared according to Formulation Example 3 and containing the ingredients shown in Table 3. /
(equivalent to the applied amount of Da) was applied, and the mortality rate was measured 2 hours later and after 1 hour. This test was repeated te times, and the average mortality rate is shown in Table 3.

Table 3 Applicant: Mitsubishi Chemical Industries, Ltd. C2 or l stone

Claims (1)

[Claims] (1) 2-Methoxy-(J-methoxyphenyl)
-7J, Tei-Oxadiazoline-! An insecticide composition characterized in that -one and the dialkylthio group t7t contain an organic phosphorus compound having a dialkyloxy group.