JPS6037082B2 - Mixed insecticidal composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides 3-methylphenyl N-methylcarbamate (MTMC) and 2-sec-butylphenyl N
- Substituted phenyl selected from methyl carbamate (BPMC) N-Methyl carbamate insecticide and phenothrin (3-phenoxybenzyl chrysanthemate)
A mixed worm composition containing fenitrothion {0,0-dimethyl 0-1 (3-methyl-4 nitrophenyl) thionophosphate} in a composition ratio of ~2:1 to 8 and 0 to this composition. It is a mixed insecticide composition containing a composition ratio of 5 to 2, and its purpose is to provide an inexpensive agricultural and horticultural insecticide that is fast-acting, has low toxicity to livestock, and has little environmental pollution. .

Particularly in recent years, Marathon (0,0-dimethyl s-[(1,2-
dicarboethoxy)ethyl phosphorodithioethate) and phenito.

In addition to thione, carbamate insecticides and BP
The number of planthoppers and chocophagi that exhibit strong resistance to MC, carbaryl, etc. is increasing, and the practicality of these drugs is becoming endangered. In order to overcome the various drawbacks of currently used insecticides as described above, the present inventor has conducted extensive research and has found the necessary conditions for insecticides, namely '
1) Fast-acting (sugar supination effect) '2'0 Low toxicity lethal effect on mammals' 4) Residual insecticidal power {5-A drug that is very close to the ideal in terms of efficacy against resistant pests, i.e. the above-mentioned 2 We have found a composition containing one or three types of insecticides.

Moreover, these mixed compositions are characterized by the above two or three types.
It is not a combination of the individual characteristics of each species, but
We have obtained new knowledge that the necessary conditions '1} to [5] above work synergistically.

The substituted phenyl N-methyl carbamate insecticide contained in the mixed composition of the present invention is generally fast-acting against many harmful insects, including rice planthoppers and leafhoppers, but has zero toxicity to mammals. Although fenitrothion is widely used as an insecticide for sanitary and agricultural and horticultural purposes, it lacks fast-acting properties.

On the other hand, in recent years, harmful insects that are resistant to carbamate insecticides and organophosphorus insecticides have appeared* in various places.
The rarity of some of them is now in question.

The phenothrin contained in the mixed composition of the present invention is a primary chrysanthemum acid ester having the following structure.

Conventional chrysanthemum acid ester insecticides are fast-acting, have little residual effect, and are considered harmless to humans and animals. Pyrethrum extract (pyrethrin), allethrin, etc. have been used, but their use is limited due to their high prices. I don't like it. However, phenothrin can be easily and inexpensively produced, and it is also useful for various lepidopteran larvae, planthoppers, green grasshoppers, and insects.
It has a strong insecticidal effect against mosquitoes, is fast-acting, and is harmless to humans and animals (
Mouse oral toxicity LD5. 9/kg with a value >5000). However, its residual insecticidal power is not comparable to certain carbamate insecticides and organophosphorus insecticides. Furthermore, the insecticidal efficacy against coleopteran insects such as mites and scale insects is not as good as that of organic phosphorus agents. By mixing two or three types of compounds with different properties, the weaknesses of phenothrin can be improved, and at the same time low toxicity, which is not found in substituted phenyl N-methyl carbamate insecticides, can be provided.

Furthermore, it was found that the chemical resistance of insect pests was eliminated, and that the residual effect, immediate insecticidal effect, and lethal effect worked synergistically. Substituted phenyl
N-Methyl carbamate insecticides and fenitrothion are involved in ganglionic junctional synapses in insects.

Phenothrin has the effect of inhibiting the activity of cholinesterase, which degrades cis-transmitters, resulting in death, and phenothrin is thought to disrupt inguinal conduction through the neuroaxonal cell membrane, and this difference in the action site of the two is combined to cause insect measles. It is presumed that it synergistically accelerates the action and promotes lethal efficacy. The substituted phenyl N-methyl carbamate insecticide used in the present invention may be used alone or as a mixture of two types.

In order to more clearly demonstrate the synergistic effect of the above-mentioned mixture, an experimental example will be shown below regarding a composition in which the above-mentioned compound phenothrin, a substituted phenyl N-methylcarbamate insecticide, and fenitrothion are further mixed therewith.

Experimental Example 1 Rapid-acting insecticidal efficacy 3 against black-and-white butterfly that shows resistance to carbamate insecticides and organophosphorus insecticides
18 to 23 rice seedlings per pot were grown at the 3 to 4 true leaf stage in a small flower pot, and the composition of the present invention in powder form and each of the single agents constituting each composition were added to 10 ares using a bell jar duster. Sprayed at a rate of 2k9 per portion.

After spraying 5. Place a flower pot in a beaker and cover with gauze, and place 20 to 20 resistant G. spp.
Release 30 fish, observe the number of falls and rolls over time, and use Finnay's illustrated method to determine KT5. (50% fall/upside down time) was determined. In addition, the insect mortality rate after 24 hours was determined. The results are shown in the table below. Experimental Example 2 Efficacy against Prunus japonicum (paddy field test) One week after the peak of ant emergence of N. prunus at the 1st stage, the composition of the present invention in powder form and each single agent constituting each composition was tested at 4k9 using a midget duster. Powder was sprinkled at a ratio of 1/1 melon.

After 20 days of dusting, beads from 5 of each plot were harvested, and the damaged stems and the number of surviving larvae were examined. The experiment was conducted in 3 replicates, with 33 samples per section.

The results are shown in the table below. *Values are shown with untreated areas set as 100.

Experimental Example 3 A rice field in an area where the resistance of the black-spotted planthopper and the brown-bottomed planthopper is a problem was tested, and the composition of the present invention in powder form and each of the single agents constituting each composition were mixed with 4k9/1 powder using a midget duster. did.

Sweeping each area 50 times before dusting and 1, 4, and 7 days after dusting, removed black-spotted black flies (total of adults and nymphs).
, we captured and measured the brown planthopper (adults only). The test was conducted in 3 repetitions with 66 samples per section. The results are shown in the following table as corrected density index. *Corrected density index is the pre-treatment ratio of each treated area divided by the pre-treatment ratio of the untreated area and multiplied by 100. Therefore, the value of the untreated area is always 100.

Experimental Example 4 Approximately one month after sowing, 180 rice seedlings planted in plastic cups were treated with one dose of the composition of the present invention in the form of an emulsion diluted to a predetermined concentration and each single agent constituting each composition.
Sprayed at a rate of 5 sprays/2 pots.

After air-drying, we covered the cage with a wire mesh cage, released adult resistant strains of black-and-white flycatchers, and examined knockdown insects over time.
The KT law value was calculated. In addition, 24 hours later, life and death are determined.
The mortality rate was calculated. KT5. S dish and John from the value
(1960) (Note 1), the synergistic action system number was calculated and shown in the following table. In addition, the mortality rate after two unique periods was plotted by Sakai (1967) (Yo 2), and Figures 1 and 2
Shown in the figure. As shown in the table below, phenothrin and BPM
C. Compositions of phenothrin and MTMC had a synergistic number of 100 or more in all combinations, and showed synergistic effects on KD activity.

As shown in Figures 1 and 2, phenothrin and BP
The compositions of MC, Fenosuri and MTMC showed synergistic action in all combinations.

Experimental Example 5 The same method as in Experimental Example 4 was used.

However, the knockdown was not compromised, and only the mortality rate was adjusted. The results are shown in the table below. Fenitrothion showed no activity at 20 pm, but phenothrin and BPMC
When fenitrothion was mixed with the composition, the mortality rate was increased.

In particular, although phenothrin only contains 4 pm or 28 ppm, 200 ppm of phenothrin
The insect mortality rate was equal to or higher than that of the conventional method, and a high force effect was observed. Note [1] Yun-peiSunandE. R. John
Kei on (1960) J. Econ. Ent・5 Milk 5-Total 7-892 Note '2} Seiroku Sakai (1967) Insect Control Science 32 (m) 79-92 In preparing the composition of the present invention, phenothrin and substituted phenyl N-methylcarbamate insecticides were used. Depending on the purpose, liquid carriers such as white kerosene, xylene, other solvents, emulsifiers or liquefied gases, etc. or solid carriers such as clay, talc, kaolin or starch may be used after mixing the agent or further fenitrothion. Oil preparations, emulsions, aerosols, powders, wettable powders, granules, baits, etc. can be prepared by methods well known to Torakani.

The present invention will be explained in detail below using formulation examples, but it goes without saying that the scope of the present invention is not limited by these formulation examples. Formulation example 1 MTMC 25 parts, Phenothrin 5 parts, Solpol SM-200 (Toho Chemical registered trademark name)
A homogeneous emulsion is obtained by adding 6 parts of Ikari and 6 parts of xylene and mixing and dissolving the 6 parts of xylene.

Formulation Example 2 MTMC group, 2 parts of fenitrothion and 0.8 parts of phenothrin were dissolved in 20 parts of acetone, and 95.2 parts of talc was dissolved in 20 parts of acetone.
Add Miyako and mix thoroughly in a Tachibana container, then sprinkle with acetone to obtain a powder.

Formulation example 3 45 parts BPMC, 5 parts phenothrin, toxinol GU
-N (Tokuyama Soda registered trademark name) 10 copies, Radio Light L (
Showa Kagaku brand name) 35 parts and Solpol 2495-1G
(Toho Chemical registered trademark name) By thoroughly mixing 5 parts, a hydrating agent with a base ingredient content of 50% can be obtained.

Formulation example 4 3 parts of BPMC, 0.5 parts of phenothrin, and tolignin C
Add 5 parts of T (registered trademark name of Toyobo) and 91.5 parts of GSM clay (registered trademark name of Siekrite Ayagyo) and mix thoroughly in a horizontal kettle.

Next, 10% of water is added to the mixture, and the mixture is further mixed and granulated using a granulator, followed by ventilation drying to obtain granules. In addition, when the emulsion obtained in Formulation Example 1 was diluted 500 times with water and sprayed on Nasigunbai parasitic on apple branches, complete control was achieved the next day. The granules obtained in Formulation Example 4 were placed in a vat with a surface size of 30 skins x 40 arcs and a depth of 7 arcs filled with water to a depth of 5 skins for one night to release Bofla (Last instar larvae of the Redfish). However, the next stamp was 100%.
The mortality rate was obtained.

[Brief explanation of the drawing]

Figures 1 and 2 show the insect mortality rates of the test chemicals in Experimental Example 4, published by Seiroku Sakai (1967) Insect Control Science 32 (m) 79-9.
2, and the area above the solid line indicates the synergistic action area. Multi 11 illustrations 2 drawings

Claims (1)

[Claims] 1 Substituted phenyl N-methyl carbamate insecticide selected from 3-methylphenyl N-methylcarbamate and 2-sec-butylphenyl N-methylcarbamate and phenothrin (3-phenoxybenzyl chrysanthemate) A mixed insecticidal composition characterized in that it contains a composition ratio of 9 to 2:1 to 8. 2 Substituted phenyl N-methyl carbamate insecticide selected from 3-methylphenyl N-methyl carbamate and 2-sec-butylphenyl N-methyl carbamate and phenothrin (3-phenoxybenzyl chrysanthemate) at 9 to 2: Fenitrothion {0,0-dimethyl 0-
(3-Methyl-4-nitrophenyl)thionophosphate} in a composition ratio of 0.5 to 2 with respect to the above mixed insecticidal composition 1.