JPH0259502A - Insecticidal composition - Google Patents

Abstract

PURPOSE:To provide an insecticidal composition capable of extremely effectively controlling especially the larvae of flies by containing 1-(4-phenoxyphenoxy-2-(2- pyridyloxy)propane and 1,3-dithiolan-2-ylidenemalonic acid diester. CONSTITUTION:An insecticidal composition contains 1-(4-phenoxyphenoxy)-2-(2- pyridyloxy)propane and 1,3-dithiolan-2-ylidenemalonic acid diester in a ratio of 1:1-100. Although the respective components of the composition are also singly useful as poisonous insect-controlling agents, the co-use of the components exhibits an excellent synergistic effect and is especially useful as a larvicide. The above-mentioned diester includes lower alkyl esters, lower alkenyl esters, benzyl esters, etc., but diisopropyl ester is preferable. When applied, two kinds of the active ingredients are used simultaneously or separately at an interval.

Description

[Detailed description of the invention] [Purpose] (Industrial application field) The present invention is directed to ■-(4-phenoxyphenoxy)-2-(
The present invention relates to an insecticidal composition containing 2-pyridyloxy)propane and a diester of 1,3-dithiolane-2-ylidenemalonic acid.

(Problems to be solved by the invention, etc.) In recent years, the emergence of harmful insects that are resistant to various insecticides such as organophosphate, carbamate, and pyrethroid insecticides has become a problem, and it is difficult to accurately identify them. Prevention is an issue.

Such resistance problems are not limited to the agricultural field, but are also recognized in sanitary pests such as flies and mosquitoes, and in particular, flies that have acquired resistance to various chemicals are emerging.

Generally, resistant and susceptible pests live in a mixed state, but the present inventors investigated a method that can accurately control pests regardless of the degree of resistance, and found that 1-(4-
phenoxyphenoxy)-2-(2-pyridyloxy)
It has been found that by using propane and a diester of 1,3-dithiolan-2-ylidenemalonic acid in combination, pests, especially fly larvae, can be controlled very efficiently.

1-(4-
phenoxyphenoxy)-2-(2-pyridyloxy)
Propane (hereinafter referred to as biliproxyfen) induces developmental abnormalities in insects and exhibits insecticidal activity.
It is publicly known from the publication No. 199673.

Furthermore, diesters of 1,3-dithiolan-2-ylidenemalonic acid, which are the other active ingredients of the present invention, are also known as pest control agents in Japanese Patent Publication No. 4609/1983.

However, as shown in the Examples below, the insecticidal composition of the present invention exhibits an excellent synergistic insecticidal effect that cannot be expected from each single agent, and therefore can be applied in various situations.

Examples of diesters of 1.3-dithiolane-2-ylidenemalonic acid include lower alkyl esters, lower alkenyl esters, and benzyl esters. Examples of lower alkyl esters include methyl, ethyl, propyl, isopropyl, Examples of lower alkenyl esters include alkyl esters having 1 to 4 carbon atoms such as butyl and isobutyl, and alkenyl esters having 2 to 4 carbon atoms such as allyl and methylallyl.

The two alcohol residues constituting the diester may be of the same type or different types, but it is more preferable that the two alcohol residues are of the same type, and even more preferable that they are the same type of alkyl ester, and the most preferable one is It is diisopropyl ester (hereinafter referred to as isobrothiolane).

The insecticidal composition of the present invention can be prepared by mixing the two active ingredient compounds with suitable carriers and/or adjuvants according to a conventional method, and can be prepared in the form of a formulation commonly used in this field, such as a wettable powder, a dry flowable formulation, or a dry flowable formulation. It can be prepared into powders, granules, emulsions, etc.

The ratio of the two active ingredients in the insecticidal compositions of the invention can vary widely. Generally speaking, the diester of 1,3-dithiolane-2-ylidenemalonic acid is used in an amount of about 1 part to 100 parts per 1 part of biliproxyfen.

In order to achieve the purpose of the present invention, it is optimal to create a composition that simultaneously contains the two types of active ingredients as described above, but each single agent may be mixed at the time of use, or in some cases The purpose can be achieved even if each single agent is treated separately at a slightly different time.

Although the insecticidal composition of the present invention can be applied in various situations, it is most preferably used as a fly control agent, particularly as a insecticide.

The present invention will be explained in more detail below with reference to Examples.

1 part of Chise Tanjo wheat bran, powdered feed for experimental animals (Funabashi Farm KK)
For one part of the mixture, add isoprothio 921 to the same weight of water.
A diluted solution of 0% hydrating powder and 10% hydrating powder of biliproxyfen mixed and dispersed as appropriate was added and stirred, and this was used as bait in a plastic cup (top diameter 6 cm, bottom inner diameter 4.6 cm).
20 2-day-old mixed-strain housefly larvae were released into the chambers (inner height: 4 cm), kept at 26°C ± 1°C, and the emergence rate of adults was examined. The emergence rate was defined as the emergence inhibition rate.

The test was conducted in two consecutive sessions in one section, and the results are shown as an average value.

Note that the expected value is the eclosion expected from the a + b mixture when there is no correlation at all between the susceptibilities of the test insects to each single agent and there is only an independent combined effect between the two. The inhibition rate Pm was calculated from the following formula [B115s, C,1,
, Ann, Appl, Biol, 26.585 (1
939)].

Pm='P a +P b (1-P a) However, Pa
indicates the actually measured inhibition rate by agent A only, pb indicates the actually measured inhibition rate by agent B only, and in the table below, Pm is expressed as a percentage (%).

Bifluorescence concentration in the test solution (ppm) 0.2 0.4 0.8 The concentration of isobrothiolane in the test solution and the E. co. [47 pieces 100 [56] 100 [66] 20 m 59 (%) 100 [66] 100 [72] 100 [78] Zikrite (for paper making) [Zikrite Chemical Mining (KK
)] Carrier 73 made by mixing and pulverizing 64.44%
25 parts of 1,3-dithiolane-2-ylidenemalonic acid dimedimethyl ester and 2 parts of liproxifen were mixed to prepare a wettable powder.

When this wettable powder was diluted 500 times with water and applied at 4 liters per square meter of compost where flies were infested, it was possible to prevent flies from appearing for about a month.

As is clear from the above table, the insecticidal composition of the present invention exhibited effects far superior to the expected values expected from each single agent.

Real part j pull & neogen powder [Daiichi Kogyo Seiyaku (KK)] 55.56
% Gohsenol [Nippon Gohsei (KK) 12.22
%, Carplex #80 [Giotsugi Pharmaceutical (KK)] 5
．． 5, Radio-z'#200 [Showa Chemical Industry (K
K) 122.22%, practicality y 79 parts of the same carrier as in Example 2, 20 parts of 1,3-dithiolan-2-ylidenemalonic acid diethyl ester and 1 part of biliproxyfen were mixed to prepare a wettable powder, When this wettable powder was diluted 500 times with water and applied at 5 liters per square meter of chicken manure deposits where flies were heavily infested, the infestation of flies was suppressed for over 20 days.

Claims (1)

[Claims] (1) 1-(4-phenoxyphenoxy)-2-(2-
pyridyloxy)propane and 1,3-dithiolane-2
- an insecticidal composition containing a diester of ylidenemalonic acid. (2) An insecticidal composition, wherein the diester of 1,3-dithiolane-2-ylidenemalonic acid according to claim 1 is a lower alkyl ester, a lower alkenyl ester, or a benzyl ester. (3) An insecticidal composition in which the lower alkyl ester according to claim 2 is an isopropyl ester. (4) An insecticidal composition according to claim 1, which is used for killing maggots.