JPH02258702A - Insect control equipment and insect control method - Google Patents

Abstract

PURPOSE:To obtain an insect control equipment by packing a chemical containing liquefied CO2 as a carrier into a pressure vessel consisting of a pressure vessel body, inner tube communicating the inside of the body with the outside and having two holes in lower end part and outer tube joining to the inner tube and having a plurality of small holes. CONSTITUTION:The insect control equipment consisting of a pressure vessel body 12 (e.g. made of steel or Al), inner tube 13 having communicating holes 13a and 13b and outer tube having a plurality of small holes and constituted so as to pack a preparation obtained by dissolving an active ingredient (e.g. alpha-cyano-3-phenoxybenzyl chrysanthemate) in liquefied CO2 therein and use the preparation by spray through a valve 16. The outer tube is joined to the inner tube between the holes 13a and 13b and opening area of the hole 13a is set so as to equal to or become larger than sum of opening area of the hole 14a and opening area of the hole 13b is set so as to equal to or become larger than sum of opening area of the hole 14a. The above-mentioned equipment is free from fear of contamination and tire by carrier and as well as change of active ingredient concentration by decrease of liquid amount in the vessel.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an insect repellent device that releases an insecticidal component dissolved in liquefied carbon dioxide gas, and an insect repellent method using the same.

<Prior Art and Problems to be Solved> Pyrethroid compounds have been widely used to control sanitary pests and unpleasant pests inhabiting various factories, offices, long car rooms, etc.

As for the properties of these preparations, for example, oil preparations, powder preparations, and aerosol preparations are often used.

However, with the above-mentioned oils, powders, etc., contamination by the carrier used in the formulation may become a problem depending on where they are used.

Further, regarding aerosol formulations, there are problems of air pollution due to fluorocarbon gas and flammability of LPG.

On the other hand, JP-A-56-113703 describes an insect repellent device in which an insecticidal component is dissolved in liquefied carbon dioxide gas.

However, as this type of insect repellent device is used, the amount of liquid in the pressure container decreases as the formulation is sprayed, and liquefied carbon dioxide gas equivalent to the decreased amount of liquid vaporizes in the pressure container. .

As a result, the concentration of the active ingredient in the emitted gas changes, making it impossible to obtain a stable effect as an insect repellent.

Further, even if the active ingredient is a pyrethroid compound, depending on its type, its effect may not be fully exhibited even if it is dissolved in liquefied carbon dioxide as described above.

Therefore, this type of insect repellent device has not yet been put into practical use.

Means for Solving the Problems> As a result of intensive studies by the present inventors on improving insect repellent devices in which the active ingredient is dissolved in liquefied carbon dioxide gas and filled in a pressure-resistant container, we have found that (a) the active ingredient is dissolved in liquefied carbon dioxide gas; An insect repellent device is a pressure-resistant container filled with a preparation made of a pressure-resistant container, and the pressure-resistant container has two communication holes arranged above and below formed in the pressure-resistant container main body and near the lower end. An inner tube is provided in the vertical direction inside the main body to communicate the inside and outside of the pressure vessel main body, and a plurality of small diameter communication holes are formed in the wall surface, and the upper and lower ends are joined to the inner tube. 1. An outer tube that covers from the upper and lower positions between the two communication holes to the vicinity of the lower end, and an inner tube is provided between the inner tube and the outer tube through the communication hole located on the upper side of the inner tube. A space is formed that communicates with the inner circumferential side of the tube and communicates with the outer circumferential side of the outer tube through a small diameter communication hole in the outer tube, and the opening area of the communication hole located on the upper side of the inner tube is The opening area of the communicating holes located on the lower side of the inner tube is set to be equal to or larger than the total opening area of the small diameter communicating holes formed in the outer tube. (c) The active ingredients of the preparation filled in this pressure-resistant container are of the following group: α-cyano-3-phenoxybenzyl 3 -(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate, α-cyano-3-phenoxyhenzyl chrysanthemate, α-cyano-(4-fluoro-3-phenoxy)benzyl 3- (2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate, 3-phenoxybenzyl 2-(4-ethoxyphenyl)-2-methylpropyl ether, α-cyano-3-phenoxybenzyl 2-[2 -chloro-4-(triflunal-comethyl)anilino]-3-methylbutanoate, 3-phenoxybenzyl chrysanthemate, and (d) the preparation contains the above-mentioned active ingredient. is dissolved in liquefied carbon dioxide gas at 0.05 to 2%, and an insect control method for controlling pests by spraying a preparation using the insect prevention device. , was found.

In addition, PBO, S-4 are added to the pyrethroid compound as an active ingredient.
The efficacy can also be enhanced by appropriately adding a synergist such as 21.

The pressure vessel body used for pressure vessels usually has a volume of 1
~50ffi is used, and its material includes iron, stainless steel, aluminum, etc.

In addition, the material of the inner tube and the outer tube include 11 copper alloy, stainless steel, etc., and the inner tube is long enough to reach the bottom of the pressure vessel main body.

The outer diameter of the inner tube is usually 4 to 12 mm, and the outer diameter of the outer tube is usually set to be 2 to 5 mm larger than the outer diameter of the inner tube.

The small diameter communication hole of the outer tube is usually 120 to 200 fllf.
About 4 to 6 pieces are provided at f+ intervals, and their diameter is usually 1 to 2! It is lll11.

Further, the length of the lower part of the inner tube that is not covered by the outer tube is usually 2 to 5 mm.

When using the insect repellent device of the present invention, the spray nozzle for discharging the preparation is usually one with a nozzle diameter of 0.2 to 3 marks, and the nozzle diameter can be adjusted depending on the size of the work space to be sprayed. By changing the jet per unit time
You can improve workability by changing the

The pyrethroid compound used as an active ingredient in the present invention has various isomers, and in the present invention, any effective isomer or a mixture of these isomers can be used.

<Example 1> An embodiment of the present invention will be described below based on FIG.

(1) Manufacturing Example As shown in FIG. 1, the pressure container 11 has a volume of 10! The pressure container main body 12 is a gas cylinder, an inner tube 13, and an outer tube 14.

The inner tube 13 has an inner diameter of 41'lll11 and an outer diameter of 6
Whale shells are used and are provided vertically inside the pressure container main body 12.

Near the bottom of the inner tube 13, there is a communication hole 13a with a diameter of 3 m located on the upper side, and a communication hole 1 with a diameter of 2 = located on the lower side.
3b are arranged vertically, and the pressure-resistant container main body 1
The inside of 2 and the outside are communicated with each other.

Further, the outer tube 14 has an inner diameter of 8 cylinders, and its upper and lower ends are joined to the inner tube 13, extending from the upper and lower positions between the communication holes 13a and 13b in the inner tube 13 to the vicinity of the lower end. It is meant to be covered.

The outer tube 14 has four communication holes 14a with a diameter of 1 cm.
・are formed at equal intervals of 18 cm.

That is, the opening area of the communication holes 13a in the inner tube 13 is set to be larger than the sum of the opening areas of the communication holes 14a formed in the outer tube 14. on the other hand,
The opening area of the communication hole 13b in the inner tube 13 is the same as that of the outer tube 14.
It is set to be equal to the total opening area of the communication holes 14a formed in the.

Note that the opening area of the communicating hole 13a may be set to be equal to the total opening area of the communicating holes 14a formed in the outer tube 14.

And between the inner tube 13 and the outer tube 14, the inner tube 13
A space 15 is formed which communicates with the inner circumferential side of the inner tube 13 through the communicating holes 13a in the outer tube 14, and communicates with the outer circumferential side of the outer tube 14 through the communicating holes 14a in the outer tube 14.

A valve 16 is attached to the upper part of the pressure-resistant container body 12, so that the preparation inside the pressure-resistant container body 12 can be sprayed through a pressure-resistant hose and a spray nozzle (not shown).

Next, a method for manufacturing an insect repellent device by filling the pressure container 811 with a preparation will be described below.

First, (R3)-α-cyano-3-
Phenoxybenzyl [IR)-cis, trans-chrysanthemate [shiftetrin], α-cyano-3-phenoxybenzyl (IR3)-cis, trans-3-
(2,2-dichlorovinyl)-22-dimethylcyclopropanecarboxylate [dibermethrin], or
Add 35 g of either 3-phenoxybenzyl (IR)-cis or trans-chrysanthemate [d-phenothrin]. Then, after installing the valve one day, 6965 g of liquefied carbon dioxide gas is filled to manufacture an insect repellent device.

(2) Test Example 1 Ten adult German cockroaches (male:female=l:1) were placed on the floor of a 5.8rrf (1.8m cubic) test room.
Three 00d capacity polyethylene cups were placed. 1 of these
One piece was left without a lid, one piece had a lid with a hole of 4C11 in diameter, and the remaining one had a lid with a hole of 2 cm in diameter.

Next, a spray nozzle with a pressure-resistant hose was attached to the insect repellent device, and a predetermined amount of liquefied carbon dioxide gas containing the active ingredient was sprayed into the test chamber from the injection port (diameter 1 am) in the test chamber.

The number of German cockroaches knocked down in each cup was counted for 1 hour after the spraying, and after the observation, the cups were collected, food and water were given in the cups, and the mortality rate after 3 days was determined.

For comparison purposes, 3-phenoxybenzyl 3-(2,2-dichlorovinyl)-2,2-dimethylcyclobrobanylupoxylate [permethrin] was used as the active ingredient.
A similar test was conducted using

The above test was repeated three times.

The results are shown in Table 1 below.

(3) Reference Example 1 In order to examine the basic efficacy of each active ingredient used in Test Example 1 above, an oil solution dissolved in deodorized kerosene at 0.5% was applied directly to 10 adult German cockroaches from a distance of 60 cm.
Sprayed with a spray gun. Immediately after spraying, the number of knocked down individuals was counted for 20 minutes, food and water were given, and the mortality rate was determined after 3 days.

The above test was repeated three times.

The results are shown in Table 2 below.

Table 2 As shown in Reference Example 1 above, in terms of the basic potency of the active ingredient, permethrin is not significantly different from that of Shiftetrin and d-phenothrin;
As shown in , it is not suitable for the formulation of the present application.

(4) Test Example 2 A 12-mesh cylindrical cage (10 cm in diameter, 30 cm in height) was suspended from the ceiling at the four corners of a 5.8 nf (1.8 m cubic) test room, and a female adult Culex pipiens was placed in the cage. I put in 20 heads.

Next, a spray nozzle with a pressure-resistant hose was attached to the insect repellent device, and a predetermined amount of liquefied carbon dioxide gas containing the active ingredient was sprayed into the test chamber from the injection port (1 cm in diameter) of the test chamber.

The number of knocked down mosquitoes in the cage was then counted for 20 minutes after spraying.

For comparison, a similar test was conducted using 3,45.6-titrahydrophthalimidomethylchrysanthemate [tetramethrin] as the active ingredient.

The above test was repeated twice.

The results are shown in Table 3 below.

Table 3 (5) Reference Example 2 To determine the basic efficacy of each active ingredient used in Test Example 2, an oil solution dissolved at 0.2% by weight in deodorized kerosene was applied to 20 adult female Culex pipiens. Released glass box (70c
+a legislation) within? , this was sprayed. Then, immediately after spraying, 2
The number of individuals that were knocked down was counted for 0 minutes.

The above test was repeated twice.

The results are shown in Table 4 below.

Table 4 As shown above, in terms of the basic efficacy of the active ingredient, tetramethrin has a knockdown efficacy superior to that of shifuettrin, but as shown in Test Example 2, it is not suitable for the formulation of the present application. It is something.

<Example 2> Other embodiments of the invention will be described below.

(1) Manufacturing Example The pressure container 11 has a volume of 71 as the pressure container main body 12, and has the same configuration as in Example 1. Further, the communication holes 14a formed in the outer tube 14 are arranged at equal intervals of 11 cm in diameter.

In the pressure container 11, dibermethrin or 3-
Phenoxybenzyl 2-(4-ethoxyphenyl)-
2-Methylpropyl ether [Ethofenbrox]
Add 10g of either of these. And valve 16
An insect repellent device is manufactured by filling the container with 4,990 g of liquefied carbon dioxide.

(2) Test Example 5.10 adult German cockroaches (a: female -1;
Three polyethylene cups were placed. One of these had no lid, one had a lid with a hole of 4 CI m in diameter, and the remaining one had a lid with a hole of 2 cm in diameter.

Next, a spray nozzle with a pressure-resistant hose was attached to the insect repellent device containing dibermethrin as an active ingredient, and a predetermined amount of liquefied carbon dioxide gas containing the active ingredient was sprayed into the test chamber from the injection port (diameter ICl11) of the test chamber.

The number of German cockroaches knocked down in each cup was counted for 1 hour after the spraying, and after the observation, the cups were collected, food and water were given in the cups, and the mortality rate was determined after 3 days.

In addition, the same method as above was used to test after half of the liquefied gas in the cylinder was released and immediately before the entire amount was released.

The results are shown in Table 5 below.

As mentioned above, by using the insect repellent device of the present invention,
Stable effects were obtained from the beginning of use to the end.

That is, when a pressure-resistant container with the above structure is used, liquefied carbon dioxide gas evaporates in the empty space as the amount of liquid in the container decreases, and the active ingredients in the liquefied carbon dioxide gradually become concentrated. As the liquid volume decreases, more vaporized carbon dioxide is mixed with the liquefied carbon dioxide from the outer tube, and the active ingredient is diluted, so the concentration of the active ingredient in the liquefied carbon dioxide that is sprayed is ultimately almost constant. becomes. As a result, as mentioned above, a stable effect can be obtained until the end.

The active ingredients of the preparation filled in the pressure container are not limited to those mentioned above, but include the following group: α-cyano-3-2 enoxybenzyl 3-(2,2-dichlorovinyl)-2,2-dimethyl Cyclopropanecarboxylate, α-cyano-3-phenoxybenzyl chrysanthemate, α-cyano-(4-fluoro-3-phenoxy)benzyl 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane Lupoxylate, 3-phenoxybenzyl 2-(4-ethoxyphenyl)-2-methylpropyl ether, α-cyano-3-phenoxybenzyl 2-(2-chloro-4-(trifluoromethyl)anilino]-3-methylbuta Any one or more pyrethroid compounds selected from Noate, 3-phenoxybenzyl chrysanthemate, and the like may be used.

<Effects of the Invention> When the insect repellent device of the present invention is used, there is no problem of contamination caused by the carrier used in the preparation, and there is no risk of fire caused by the carrier. Moreover, there is no change in the concentration of the active ingredient due to a decrease in the amount of liquid in the pressure-resistant container, and stable effects can be obtained from the start of use to the end of use.

Furthermore, the sprayed fine particles penetrate deep into crevices and the like, making them extremely effective in controlling pests hiding in crevices that were previously difficult to control.

[Brief explanation of drawings]

FIG. 1 is a sectional front view showing the structure of a pressure-resistant container of an insect control device according to the present invention. In FIG. 1, 11 represents a pressure-resistant container, 12 represents a pressure-resistant container body, 13 represents an inner tube, and 13a and 13b represent communication holes formed in the inner tube 13. 14 represents the outer tube;
14a... represents a small diameter communication hole formed in the outer tube 14. 15 represents space.

Claims (2)

[Claims] (1) (a) An insect repellent device in which a preparation in which an active ingredient is dissolved in liquefied carbon dioxide gas is filled in a pressure-resistant container, and (b) the pressure-resistant container has the following components: a pressure-resistant container body; Two communicating holes arranged above and below are formed, an inner pipe is provided vertically inside the pressure vessel main body to communicate the inside and outside of the pressure vessel main body, and a plurality of small diameter communication holes are formed on the wall surface. , an outer tube whose upper and lower ends are joined to the inner tube and covers the inner tube from the upper and lower positions between the two communication holes to the vicinity of the upper end; between the inner tube and the outer tube, A space is formed that communicates with the inner circumferential side of the inner tube through a communication hole located on the upper side of the inner tube, and communicates with the outer circumferential side of the outer tube via a small diameter communication hole in the outer tube, and The opening area of the communication holes located on the upper side of the tube is set to be equal to or larger than the sum of the opening areas of the small diameter communication holes formed in the outer tube, while the opening area of the communication holes located on the upper side of the inner tube The opening area of the communicating holes located on the side is set to be equal to the total opening area of the small diameter communicating holes formed in the outer tube, and (c) the active ingredient of the preparation filled in this pressure-resistant container. is the following group, α-cyano-3-phenoxybenzyl 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate, α-cyano-3-phenoxybenzyl chrysanthemate, α-cyano- (4-fluoro-3-phenoxy)benzyl 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate, 3-phenoxybenzyl 2-(4-ethoxyphenyl)-2-methylpropyl ether, One or more pyrethroid compounds selected from α-cyano-3-phenoxybenzyl 2-[2-chloro-4-(trifluoromethyl)anilino]-3-methylbutanoate, 3-phenoxybenzyl chrysanthemate, (d) The preparation comprises 0.05 to 2% of the active ingredient dissolved in liquefied carbon dioxide gas. (2) An insect control method for controlling pests by using the insect control device according to claim (1) and spraying a preparation.