JP3344067B2 - Heat transpiration insecticidal method and insecticide solution - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an insecticide solution for heat transpiration.

[0002]

2. Description of the Related Art Conventionally, there has been known a heat evaporation insecticidal method in which a part of a liquid absorbing core is immersed in an insecticide solution and the upper part of the core is heated to evaporate the absorbed insecticide solution. It has become popular because there is no need to replace the mat every day like a so-called electric mosquito collecting mat.

[0003]

However, in the method of heat transpiration and insect killing using such an absorbent core, there is generally a problem of insufficient insecticidal efficacy due to a low effective volatilization rate of the insecticide. That is, if the heating temperature of the upper part of the liquid absorbing wick is increased, the amount of the insecticide volatilized per unit time can be increased, but in that case, clogging inside the wick is liable to occur, and one wick can be used. It may be difficult to perform heat evaporation for a long period of time such as 30 to 60 days.

[0004]

SUMMARY OF THE INVENTION The present invention provides a heating method of 105 to 130 which is relatively low in temperature and hardly causes clogging of the core.
An object of the present invention is to provide a method capable of effectively volatilizing an insecticide even by indirect heating at about ° C, and an insecticide solution suitable for use in the method.

According to the present invention, 0.5 to 0.5%
By containing 20% by weight, preferably 2 to 10% by weight of a terpenoid, the effective volatilization rate of the insecticide can be improved, and as a result, the insecticidal effect is also increased.

The terpenoid used in the present invention means a hydrocarbon having a composition of (C ₅ H ₈ ) _n , an oxygen-containing compound derived from the hydrocarbon, and an unsaturated compound having a different degree of unsaturation. , Terpene alcohol, terpene aldehyde, terpene ketone, terpene oxide, terpene lactone and the like. Terpenoids include monoterpenoids and sesquiterpenoids, but in the present invention, the use of monoterpenoids is preferred. Specific examples of the monoterpenoid include monoterpene alcohols such as menthol, terpineol and geraniol, monoterpene ketones such as carvone, mentone and pulegone, monoterpene aldehydes such as perilaldehyde, safranal, rosinal, and geranial, and monoterpene aldehydes such as linalool oxide. Monoterpene hydrocarbons such as terpene oxide, carene, pinene, limonene and the like can be mentioned.

[0007] The insecticide solution used in the present invention comprises:
Usually, an organic solvent solution, particularly an aliphatic hydrocarbon solution having 12 to 18 carbon atoms is used. The aliphatic hydrocarbon is dodecane, tridecane, tetradecane, pentadecane, hexadecane, heptadecane, octadecane and a mixture thereof as a main component. Commercially available normal paraffin (Mitsuishi
Texaco Chemical Co., Ltd.), IP Solvent 2028
(Made by Idemitsu Petrochemical Co., Ltd.) and the like. As the insecticide, a pyrethroid compound, an organic phosphorus compound, a carbamate compound, or the like is used.
10 to 10% by weight, preferably 0.5 to 5% by weight. As shown in Example 3 below, it is preferable to use a pesticide solution containing 0.1 to 10% by weight of a pyrethroid compound also having a repellent effect. The amount ratio of insecticide to terpenoid in the insecticide solution is generally 1: 0.5 by weight.
１ ： 1: 30, preferably in the range of 1: 2 to 1:10.

Specific examples of the pyrethroid compound used include, for example, allethrin, framethrin, pramethrin, resmethrin, phenothrin, permethrin, cyphenothrin, empentrin, benfluthulin, terarethrin, phthalthrin, and the like. By heating the upper part of the wick containing the wick to about 60 to 150 ° C., it is possible to perform the heat transpiration insecticidal. In particular, Aresulin,
When using framethrin or prarethrin, the number of carbon atoms is 12
~ 18 as the aliphatic hydrocarbon solution,
Indirect heating to about 130 ° C is preferred.

The material of the absorbent core used is usually a porous material such as clay, talc, kaolin, diatomaceous earth, gypsum, perlite, bentonite, acid clay, glass fiber, asbestos and the like, and carboxymethyl cellulose (CMC). A product obtained by caking and molding with a paste such as starch, gum arabic, gelatin, polyvinyl alcohol and the like is used. As the inorganic powder, gypsum, clay, diatomaceous earth, acid clay, and pearlite are preferable.
Is preferred. The amount of glue used is 1% of the weight of the entire core.
-10% by weight is preferred. In addition, a pigment,
Preservatives and the like can be appropriately added.

[0010]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to only the following examples. Example 1 A mixed powder of 5 parts by weight of gypsum, 5 parts by weight of clay and 3 parts by weight of diatomaceous earth was caking using 0.5 part by weight of CMC,
By molding, a porous liquid absorbent core having a diameter of 7 mm and a length of 7 cm was prepared. On the other hand, a normal paraffin (manufactured by Mitsuishi-Texaco Chemical Co., Ltd.) solution prepared so as to contain d-arrestrin and l-carvone at the concentrations shown in Table 1 below,
45 ml was placed in a container, and the above-mentioned porous liquid-absorbing core was set as shown in FIG. 1, and the heating element was heated so that the core surface temperature was 125 ° C. The amount of volatilized per unit time of the insecticidal active ingredient d-arlesrin was measured by the following method. The apparatus shown in FIG. 1 is placed on a glass petri dish, and a glass ventilation tube is put on the upper portion.
Was connected. The sampling column was connected to a suction pump, the suction amount was adjusted to 2 liter / min, and suction was performed for a certain time. After the suction, d-wash the sampling column and ventilation tube with acetone.
Allesulin was recovered and analyzed by gas chromatography. Table 1 shows the amounts of volatilization measured in 5 repetitions.

[0011]

[Table 1] As can be seen from the above table, the addition of l-carvone, a terpenoid, can increase the volatilization amount of d-aresulin, which is an active insecticide. In addition, even when d-framethrin or prarethrin and l-carvone are used, almost the same results as those obtained when d-arrestrin and l-carvone are used are obtained.

Example 2 A metal cylinder (diameter 20 cm, height 80 cm) was placed on the same device as in Example 1 after 4 hours of power supply, 10 adult female Aedes aegypti were placed on the metal cylinder, and nylon nets were placed on both sides. Glass tube (diameter 4cm, height 12c)
m), and count the number of knockdowns over time to obtain a KT ₅₀
Value (time for 50% knockdown) and KT ₉₀ value (90
% Knockdown time). Table 2 shows the average results of three replicates.

[Table 2] As can be seen from the above table, the knockdown effect can be enhanced by the addition of the terpenoid l-carvone.

Example 3 The same apparatus as in Example 1 was installed in a large chamber (28 m ³ ) set to be ventilated four times per hour, and one tester was placed in the large chamber 4 hours after energization. , One adult female of Aedes aegypti was released at 3 minute intervals (20-30 animals in total), and the stereotactic behavior of the tester was observed.
The stereotaxic effect was investigated. Table 3 shows the results.

[Table 3] As can be seen in the above table, the addition of the terpenoid l-carvone can enhance the stereotactic behavior inhibitory effect,
Blood sucking damage can be suppressed.

[0014]

According to the heat-transpiration insecticidal method using the insecticide solution of the present invention, the insecticidal effect is enhanced by increasing the amount of volatilization per unit time. In addition, since unnecessary high-temperature heating is not required to increase the volatilization amount, clogging of the core due to decomposition of the drug or the like can be suppressed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of an apparatus used in the method of heat-transpiration and insect-killing of the present invention.

[Explanation of symbols]

 1 is an insecticide solution, 2 is a heating element, and 3 is a liquid absorbing core.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-196418 (JP, A) JP-A-1-308204 (JP, A) JP-A-4-330003 (JP, A) (58) Field (Int. Cl. ⁷ , DB name) A01N 25/00 A01N 53/00

Claims (6)

(57) [Claims] 1. A method of heating and transpiring insects in which a part of a liquid absorbent core is immersed in an insecticide solution and the upper part of the core is heated to evaporate the absorbed insecticide solution. A method for killing insects by heat transpiration, wherein the terpenoid is contained in an amount of 0.5 to 20% by weight.
In the case of hydrogenated monoterpene dimer, its content
The amount is less than 10% by weight) . 2. The method according to claim 1, wherein the terpenoid is a monoterpenoid. 3. The method according to claim 1, wherein the insecticide solution is an aliphatic hydrocarbon solution having 12 to 18 carbon atoms containing 0.1 to 10% by weight of a pyrethroid compound and 0.5 to 20% by weight of a monoterpenoid. The method of claim 1, wherein the insects are heated and transpired. 4. An insecticide solution containing 0.5 to 20% by weight of a terpenoid , wherein
In the case where theoid is a hydrogenated monoterpene dimer,
Its content is less than 10% by weight) . 5. The insecticide solution according to claim 4, wherein the terpenoid is a monoterpenoid. 6. An aliphatic hydrocarbon solution having 12 to 18 carbon atoms containing 0.1 to 10% by weight of a pyrethroid compound and 0.5 to 20% by weight of a monoterpenoid. An insecticide solution according to claim 4.