JP6086646B2 - Control method for bed bugs - Google Patents

Description

The present invention relates to a method for controlling bed bugs.

Conventionally, aerosol agents for controlling worms such as cockroaches and bed bugs have been widely used. As a method for extermination, a method in which a drug is sprayed directly on an apparent insect pest is generally used, and imiprotrin having excellent knockdown activity (rapid effect) is mainly used as an active ingredient. On the other hand, there is also known a residual spray treatment method in which an insecticide having a residual effect is applied in advance to the path of a pest, and the pest is brought into contact with the pest to remove it.

In the latter residual spray treatment method, some documents have been disclosed that show the residual effect on cockroaches, but the residual effect over a long period of time has not been sufficiently studied. For example, Patent Document 1 discloses a cockroach aerosol agent excellent in residual effect after 2 weeks by blending imiprothrin and a specific higher fatty acid ester compound. However, the use of ethanol or isopropanol as the solvent is preferred, and it is not always effective against insect pests other than cockroaches, such as bed bugs. Further, Patent Document 2 describes a method for controlling pests using an aerosol product having a function of spraying a predetermined amount with vigorous spraying. In addition, although it is described that a method for quantitative spraying with a spraying force of 0.25 to 1.40 N at a spraying distance of 5 cm is effective for black cockroaches, it is intended only for direct spraying and has a residual effect. Is not mentioned. As described above, with regard to the residual spray treatment method for moth pests, there are only a few literatures on cockroaches, and there have been few studies on efficient control methods for soot and bed bugs. It is. However, in recent years, the spread of bed bugs has become a social problem in some hotels and accommodations, and urgent measures are required.

JP 2010-163378 A JP 2006-325489 A

The present invention provides a convenient and efficient method for controlling bed bugs by studying the ecology and habits of bed bugs lurking in gaps, cracks, etc. indoors, and developing aerosol agents suitable for control based on this The purpose is to do.

The present invention has been found that the following constitution has an excellent effect for achieving the above-mentioned object.
A pest control ingredient that is cyphenothrin, or imiprothrin and phenothrin,
And a normal paraffin solvent having 10 to 18 carbon atoms as a main component ,
Using an aerosol agent consisting of an aerosol stock solution having a kinematic viscosity at 30 ° C. of 1.8 to 2.4 mm ² / S and a liquefied gas,
And with a spray force of 3.5 to 4.8 gf at a spray distance of 20 cm,
Two wood boards of 20 cm × 20 cm × 2 cm (thickness) were placed in parallel with the thickness portion as the bottom, and 5 mL of the test aerosol agent was sprayed from a distance of 20 cm with a gap of 1 cm provided between the two pieces. After 1 week and 2 weeks, release the bedbugs from the gap between the spray side and the opposite side, contact with the drug for 10 minutes, and then transfer to a clean container. A method for controlling bed bugs, characterized in that

The bed bug control method of the present invention performs residual spray treatment using an aerosol agent that can reach the chemical solution deep into the gap, and therefore, the effect of being able to easily and efficiently control bed bugs lurking in indoor gaps, cracks, etc. Play.

The aerosol used in the method for controlling bed bugs of the present invention comprises an aerosol stock solution and a propellant. Here, examples of the pest control component to be blended in the aerosol stock solution include various known insecticidal components such as pyrethroid, organosilicon, and neonicotinoid insecticides. Examples of the pyrethroid insecticidal component include natural or synthetic pyrethroids such as phthalthrin, resmethrin, imiprotorin, allethrin, praretrin, furamethrin, phenothrin, ciphenothrin, permethrin, cifluthrin, transfluthrin, methfluthrin, profluthrin, etofenprox, insect repellent extract, etc. An insecticidal component can be illustrated. Of these insecticidal components, stereoisomers and optical isomers may exist, but it is needless to say that the use of each of these or any mixture thereof is also included in the present invention. Examples of organosilicon insecticides include silafluophene, and examples of neonicotinoids include, but are not limited to, imidacloprid, clothianidin and dinotefuran. Above all, the pyrethroid system is more preferable from the viewpoints of safety and rapid efficacy.
The blending amount of the pest control component is suitably about 0.01 to 5.0 W / V% per aerosol stock solution. If it is less than 0.01 W / V%, the desired effect cannot be obtained. On the other hand, even if it exceeds 5.0 W / V%, there is no particular advantage.

Further, the aerosol stock solution contains a saturated aliphatic hydrocarbon having 10 to 18 carbon atoms as a solvent, and has a kinematic viscosity at 30 ° C. of 1 to 7 mm ² / S. As the saturated aliphatic hydrocarbon, either normal paraffin or isoparaffin can be used, but normal paraffin is more preferable in terms of control performance.
In addition to the above saturated aliphatic hydrocarbon having 10 to 18 carbon atoms, other solvents such as esters, glycol ethers, and ketones may be added as appropriate without departing from the spirit of the present invention. I do not care.

By the way, bed bugs usually live in narrow gaps and cracks indoors, and unlike cockroaches, they do not move violently even if they touch the drug solution, so in order to efficiently control bed bugs, the sprayed drug solution is located in the back of the gap etc. It is necessary to make the contact with the chemical solution possible for a sufficient period. Therefore, in the present invention defines a kinematic viscosity at 30 ° C. of an aerosol stock solution 1 to 7 mm ² / S, preferably to 1 to 5 mm ² / S. This is because when the kinematic viscosity at 30 ° C. is less than 1 mm ² / S, the residual effect decreases because the solvent in the aerosol stock solution is volatilized quickly. On the other hand, when the viscosity exceeds 7 mm ² / S, the viscosity is too high. This is because it may not be possible to reach the back of the gap or the like, or the permeability to the bed bug body may be reduced. In addition, if the viscosity is too high, wetting of the coated surface remains for a longer time than necessary, and there is an unavoidable concern that problems may arise due to adhered dust or the like.

In the present invention, in addition to the above components, a synergist, an acaricide, an antifungal agent, an antibacterial agent and a bactericidal agent, or a fragrance, repellent, powder, stabilizer and the like may be appropriately blended. Absent. Examples of synergists include piperonyl butoxide and N- (2-ethylhexyl) -bicyclo [2,2,1] -hept-5-ene-2,3-dicarboximide. Examples thereof include methyl 5-chloro-2-trifluoromethanesulfonamide benzoate, phenyl salicylate, 3-iodo-2-propynylbutyl carbamate and the like. On the other hand, antifungal agents, antibacterial agents and fungicides include hinokitiol, 2-mercaptobenzothiazole, 2- (4-thiazolyl) benzimidazole, 5-chloro-2-methyl-4-isothiazolin-3-one, trifolin, Examples thereof include 3-methyl-4-isopropylphenol and ortho-phenylphenol. Examples of the fragrance include orange oil, lemon oil, lavender oil, lime oil, yuzu oil, jasmine oil and the like, and aromatic components such as limonene, linalool, terpineol, geraniol, phenethyl alcohol, and benzyl acetate.
In addition, as repellents, natural essential oils such as cinnamon, citronella, lemongrass, bergamot, eucalyptus, etc., as well as synthesis of diet, dimethylphthalate, p-menthane-3,8-diol, caran-3,4-diol, etc. Examples include, but are not limited to these.

The aerosol agent used in the present invention may contain inorganic powder and organic powder such as silicate powder, kaolin, clay, talc, diatomaceous earth and the like. Such powder is useful in terms of controlling effect because it adheres to the body surface of bed bugs and inflicts scratches to increase the penetration of the pest control component in the body and also contributes to the transmission of the pest control component by contact between individuals. Is expensive.

Examples of the propellant constituting the aerosol used in the present invention include liquefied petroleum gas (LPG), dimethyl ether (DME), and liquefied gas such as Freon gas, and one or more of them may be appropriately employed. However, it is easy to use what is mainly LPG. The blending ratio of the aerosol stock solution and the propellant is not particularly limited, but is 30:70 to 70:30 (volume ratio), more preferably 35:65 to 60:40 (volume ratio) in order to efficiently control bed bugs. It is good to set to.

In the method for controlling bed bugs according to the present invention, it is essential to use an aerosol agent having an injection force of 2 to 8 gf at an injection distance of 20 cm and to carry out a residual spray treatment in gaps, cracks, etc. where bed bugs are hidden. When the spray force is less than 2 gf, the spraying momentum is insufficient and the spray particles do not reach the back of the gap, so that a satisfactory pest control effect cannot be obtained. On the other hand, when the injection force exceeds 8 gf, the momentum of the injection is too strong, and when spraying directly on the bed bug, the bed bug may blow off, or the adhesion of the spray particles in the gap may become uneven, which may hinder the effectiveness. is there.

The container filled with the aerosol agent may be appropriately selected in the shape of a valve, a nozzle, a nozzle, and the like according to the use scene, application conditions, and the like as long as the injection force in the above range is secured. Further, the injection amount may be appropriately determined in consideration of the usage scene, the habitat of bed bugs, and the like, but about ² to 50 mL / m ² is appropriate as a guide.

The present invention provides a particularly effective control method for bed bugs inhabiting gaps in indoor furniture, joinery, etc., but other insect pests such as cockroaches such as German cockroaches, American cockroaches, black cockroaches, etc. Of course, it can be appropriately used for ants, beetles, coral beetles, brackish beetles, and the like.

Next, the method for controlling bed bugs according to the present invention will be described in more detail based on specific examples and test examples, but the present invention is not limited to these.

Cyfenothrin 1.0 W / V% was dissolved in neothiozole (Chuo Kasei Co., Ltd., normal paraffin hydrocarbon solvent) to prepare an aerosol stock solution. The kinematic viscosity at 30 ° C. of this aerosol stock solution was measured and found to be 3.0 mm ² / S. 40 mL of this aerosol stock solution and 60 mL of liquefied petroleum gas (aerosol stock solution / propellant ratio 40/60 (volume ratio)) were pressure-filled into an aerosol container to produce an aerosol agent used in the present invention. The spray force of this aerosol agent at a spray distance of 20 cm was 5.2 gf.
When this aerosol agent was used to carry out residual spraying treatment in the gaps between the walls of the bedroom and furniture, a high control effect against bed bugs was confirmed for 3 to 4 weeks.

According to Example 1, various aerosol agents shown in Table 1 were prepared, and the tests shown below were conducted.
(1) Residual effect test Two wooden boards of 20 cm × 20 cm × 2 cm (thickness) were placed in parallel with the thickness portion as the bottom, and a 1 cm gap was provided between the two. 5 mL of the test aerosol was sprayed from a distance of 20 cm over the gap. After a predetermined time, the bed bugs were released from the gap on the side opposite to the spray side and contacted with the drug for 10 minutes, then transferred to a clean container, and the number of lethals after 24 hours was observed to determine the mortality rate (%).
(2) State of spray coated surface The state of the sprayed coated surface after two weeks after the treatment was visually evaluated.
○: Spray particles reach the back of the gap, and the coated surface is uniform.
Δ: The spray particles have a trace of reaching the back of the gap, but the coated surface is uneven.
X: Spray particles do not reach the back of the gap.

As a result of the test, the method for controlling bed bugs of the present invention, that is, using an aerosol agent consisting of an aerosol stock solution having a kinematic viscosity of 1 to 7 mm ² / S at 30 ° C. and a liquefied gas, and 2 to 8 gf at a spray distance of 20 cm. It was confirmed that the residual spray treatment with spray force exerted a high residual lethal effect on bed bugs for 2 weeks. Further, the spray particles reached the back of the gap, and the state of the coated surface was uniform.
On the other hand, when the kinematic viscosity of the aerosol stock solution is less than 1 as in Comparative Example 1 or when the injection force at an injection distance of 20 cm is less than 2 gf as in Comparative Example 3, a sufficient effect is obtained in the residual effect test. I couldn't. Moreover, in Comparative Example 2 in which the kinematic viscosity of the aerosol stock solution exceeded 7 mm ² / S, the residual effect was inferior because the chemical solution did not reach the back of the gap. Furthermore, when the spraying force at a spraying distance of 20 cm exceeds 8 gf (Comparative Example 4), the spray application surface becomes uneven and the residual effect is not reduced. When the efficacy test was conducted, it became clear that bed bugs were blown off by the momentum of the injection, which hindered the effect.

The method for controlling bed bugs of the present invention can be used in various scenes not only for bed bugs but also for the control of other insect pests such as cockroaches and ants.

Claims (1)

A pest control ingredient that is cyphenothrin, or imiprothrin and phenothrin,
And a normal paraffin solvent having 10 to 18 carbon atoms as a main component ,
Using an aerosol agent consisting of an aerosol stock solution having a kinematic viscosity at 30 ° C. of 1.8 to 2.4 mm ² / S and a liquefied gas,
And with a spray force of 3.5 to 4.8 gf at a spray distance of 20 cm,
Two wood boards of 20 cm × 20 cm × 2 cm (thickness) were placed in parallel with the thickness portion as the bottom, and 5 mL of the test aerosol agent was sprayed from a distance of 20 cm with a gap of 1 cm provided between the two pieces. After 1 week and 2 weeks, let go of the bedbugs through the gap between the spray side and the opposite side, contact with the drug for 10 minutes, and then transfer to a clean container. A method for controlling bed bugs, characterized in that