JP2019206480A - Mosquito attraction method - Google Patents

Abstract

To provide a mosquito attraction method suitably usable for a mosquito trap that attracts and catches mosquitoes by generating carbon dioxide gas.SOLUTION: A method is intended to attract mosquitoes by decomposing an organic gas using photocatalysis so as to generate carbon dioxide gas. The method uses, as a source for generating the organic gas, a chemical solution containing brewage and having an alcohol by volume of 1-50 degrees.SELECTED DRAWING: None

Description

  The present invention relates to a method for attracting mosquitoes, and more particularly to a method for attracting mosquitoes that attracts mosquitoes by generating carbon dioxide using a photocatalyst.

  Mosquito sucks blood itch and causes blood rash and dermatitis at blood sucking site. In particular, some mosquitoes are considered to be hygienic and extremely harmful insects because they transmit pathogens such as dengue fever, zika fever, yellow fever, encephalitis, and malaria.

  Blood-sucking insects such as mosquitoes have a thermal sensor that senses the body temperature of animals, a taste receptor that senses taste, an olfactory receptor that senses volatile substances such as body odor, and a carbon dioxide that senses carbon dioxide, which is a highly volatile substance. It possesses an excellent chemoreceptive system such as a carbon receptor and takes various actions. For example, female mosquitoes seek blood before spawning, follow the carbon dioxide and body odor that the animal exhales by breathing, approach the animal, detect the body temperature with a thermal sensor, detect the target animal, and suck blood It has been.

  Conventionally, mosquitoes are collected by generating carbon dioxide (carbon dioxide) using the habit of being easy to gather mosquitoes where the density of carbon dioxide is high. For example, Patent Document 1 discloses an anatase-type titanium oxide that generates an organic gas, an ultraviolet irradiation unit that irradiates ultraviolet rays, an anatase-type titanium oxide that receives the ultraviolet rays and decomposes the organic gas to generate carbon dioxide. A photocatalyst part having a photocatalyst sheet, the organic gas supply part, the ultraviolet irradiation part and the photocatalyst part are accommodated, a storage container having a window, and a mesh having a size slightly larger than a size through which the mosquito can pass through the window. A mosquito trap using a titanium oxide photocatalyst having a mosquito sorting net and a collection unit for collecting mosquitoes that have entered the storage container through the mesh has been proposed.

Japanese Patent Laid-Open No. 2006-86790

When collecting mosquitoes with a mosquito catcher, it is necessary to attract mosquitoes to the mosquito catcher, but it is required to expand the mosquito attracting range to capture and control mosquitoes more efficiently.
Then, this invention makes it a subject to provide the mosquito attracting method which can be used suitably for the mosquito catcher which attracts and collects mosquito by generating carbon dioxide.

  As a result of intensive studies, the inventors of the present invention contain brewed alcohol as a source of organic gas for generating carbon dioxide when decomposing organic gas with a photocatalyst to generate carbon dioxide, and alcohol. It has been found that the use of a medicinal solution having a frequency in a specific range improves the attractiveness of mosquitoes and enables efficient capture of mosquitoes, thus completing the present invention.

That is, the present invention is characterized by the following (1) to (4).
(1) A method for attracting mosquitoes by decomposing an organic gas with a photocatalyst to generate carbon dioxide, which contains brewed liquor as a source of the organic gas and has an alcohol content of 1 to 50 degrees A method of attracting mosquitoes using a certain chemical.
(2) The method for attracting mosquitoes according to (1) above, wherein the brewed sake is sake made from rice, water and rice bran.
(3) The method for attracting mosquitoes according to (1) or (2), wherein the chemical solution contains 10% by mass or more of the brewed liquor.
(4) An organic gas supply unit that contains the chemical solution and generates the organic gas, an ultraviolet irradiation unit that irradiates ultraviolet rays, and a photocatalytic sheet that receives the ultraviolet rays and decomposes the organic gas to generate the carbon dioxide gas. The attraction of mosquitoes according to any one of (1) to (3) above, in which the carbon dioxide concentration per 100 L of space is increased by 5 to 30 ppm / hr using a carbon dioxide generator having a photocatalyst unit. Method.

  The mosquito attracting method of the present invention exhibits excellent mosquito attracting properties, and the method can enhance the mosquito attracting and controlling effects.

It is a perspective view which shows the structure of the olfactometer used in the Example. It is a schematic block diagram which shows the structure of the carbon dioxide generator used in the Example.

Hereinafter, the method for attracting mosquitoes of the present invention will be described in detail.
The method for attracting mosquitoes of the present invention is a method for attracting mosquitoes by decomposing an organic gas using a photocatalyst to generate carbon dioxide (carbon dioxide).

  In the method for generating carbon dioxide used in the method for attracting mosquitoes of this embodiment, a method is used in which an organic gas (volatile organic compound) that decomposes to generate carbon dioxide is decomposed by the photocatalytic action of the photocatalyst. The oxidation-reduction reaction of the photocatalyst is said to occur when the photocatalyst is excited by absorbing light energy and the generated electrons and holes react with water and oxygen in the air to generate active oxygen. When the generated active oxygen comes into contact with the organic gas, the organic matter is oxidatively decomposed to generate carbon dioxide (carbon dioxide).

  In this embodiment, a chemical solution containing brewed liquor and having an alcohol content of 1 to 50 degrees is used as a source of organic gas.

  Brewed liquor refers to liquor made by fermenting raw materials such as cereals and fruits, while liquor obtained by distilling brewed liquor is called distilled liquor. Distilled liquor removes and reduces the aromatic component of the brewed liquor during the distillation process. Therefore, the brewed liquor containing more fragrant component is used in the present invention.

  Examples of the brewed sake include Japanese sake, fruit wine (wine and cider), beer, and Shaoxing sake. Among them, wine and Shaoxing liquor are known to attract to Drosophila, but when used, unique odors can cause discomfort to humans. Among the brewed sakes, sake is more preferably used from the viewpoint that mosquitoes can be attracted selectively and less unpleasant to humans during use because of its low attractiveness to Drosophila.

  Japanese sake is sake made by fermenting alcohol using rice, water and rice bran as raw materials. The rice starch is decomposed (saccharified) into monosaccharides (specifically, glucose) by rice bran enzyme, and the decomposed monosaccharides are subjected to alcohol fermentation with enzymes produced by yeast. Since sake is brewed in a form called parallel double fermentation in which two chemical reactions of “saccharification” and “alcohol fermentation” are simultaneously performed, many components relating to taste and aroma are produced. Japanese sake is roughly classified into pure rice sake, ginjo sake, and honjo sake depending on whether or not brewing alcohol is added. Any sake may be used. Sake is presumed to be able to enhance the attraction effect due to the generation of carbon dioxide and other fragrance components and components generated by the photocatalytic reaction with the fragrance components.

  The alcohol content (alcohol concentration (v / v%)) of the brewed liquor is preferably 1 to 50 degrees, more preferably 3 to 40 degrees, and still more preferably 10 to 20 degrees. If the alcohol content is 1 degree or more, an organic gas can be generated, so that it can be decomposed by the photocatalytic action of the photocatalyst to generate a carbon dioxide gas. If the alcohol content of the brewed liquor is too high, the amount of other components (specifically, components related to taste and aroma, etc.) will be relatively small, and the attractiveness may be reduced, so it is 50 degrees or less. It is preferable.

  Mosquitoes have a habit of taking sugar in addition to blood sucking. The sugar concentration of the brewed liquor is not particularly limited, but is preferably 1 to 50 g / 100 g, and more preferably 3 to 25 g / 100 g. A saccharide concentration of 1 g / 100 g or more is preferable because it can exert a mosquito attracting effect. In addition, when the sugar concentration is too high, other components (specifically, components relating to taste and aroma) are relatively not included, and therefore it is preferably 50 g / 100 g or less.

  The chemical solution can contain a known attracting component as long as the generation of carbon dioxide gas due to the photocatalytic reaction is not suppressed.

  Examples of the attraction component include distilled spirits such as brandy, whiskey, rum, vodka and shochu; brewed vinegars such as black vinegar, red vinegar, vinegar, apple vinegar and rice vinegar; apples, oranges, mandarin oranges, strawberries, grapes, Fruit extracts such as melon, banana, mango, pineapple and processed fruit products (juice, paste, etc.); sugars such as honey, liquid sugar, maple syrup; lactic acid products such as lactic acid beverages, yogurt, cheese; Etc. These preferably contain a volatile component that gasifies at room temperature.

  In addition, the chemical solution of the present invention contains additives such as insecticidal components, antibacterial components, colorants, ultraviolet absorbers, holding agents, lubricants, solvents, etc., as long as the generation of carbon dioxide by photocatalytic reaction is not suppressed. Can do.

  Examples of the insecticidal component include dichlorvos, fenitrothion, IBTA, IBTE, transfluthrin, metflufluthrin, profluthrin, empentrin, propoxur, fenocarb, amidoflumet, dinotefuran, fipronil, hydramethylnon, carbaryl and the like.

  Examples of the antibacterial component include chlorine dioxide, iodine, thymol, isopropylmethylphenol, formaldehyde, glutaraldehyde, ethanol, propyl alcohol, phenol, cresol, phenoxyethanol, cetylpyridinium chloride, and the like.

  Examples of the colorant include blue No. 1, yellow No. 4, and the like.

  As an ultraviolet absorber, a tris resorcinol triazine type compound, a benzotriazole type compound, a hydroxyphenyl triazine type compound, etc. are mentioned, for example.

  Examples of the retaining agent include water-absorbing polymers such as an acrylic acid-based crosslinked product, and a crosslinked isobutylene / maleic anhydride copolymer sodium salt.

  Examples of the lubricant include surfactants such as sodium lauryl sulfate.

  Moreover, you may use a solvent for the chemical | medical solution of this invention in order to melt | dissolve the component contained in a chemical | medical solution. Examples of the solvent include lower alcohols such as methanol and propanol, alcohol components such as ethanol (industrial alcohol) other than brewed liquor (that is, drinking), water, and the like.

The chemical solution can be obtained by mixing brewed liquor and optional components.
The brewed liquor is preferably contained in the chemical solution in an amount of 5% by mass or more. By containing 5% by mass or more of brewed liquor in the chemical solution, carbon dioxide sufficient for attracting mosquitoes can be generated by a photocatalytic reaction. The brewed liquor is more preferably contained in the chemical solution at 10% by mass or more, and more preferably 30% by mass or more. The upper limit of the content of the brewed liquor is not particularly limited, but is preferably 100% by mass or less, and more preferably 90% by mass or less.

  In this embodiment, the alcohol content of the chemical solution is adjusted to 1 to 50 degrees. It is preferable that the alcohol content of the chemical solution is 1 degree or more because alcohol volatilized from the chemical solution is supplied to the carbon dioxide generator and becomes a carbon source for releasing the carbon dioxide gas. From the viewpoint of easy adjustment of the alcohol content based on the alcohol content of the brewed liquor that is the main component of the chemical solution, it is preferably 50 degrees or less. The lower limit of the alcohol content of the chemical solution is more preferably 3 degrees or more, further preferably 5 degrees or more, and the upper limit is more preferably 30 degrees or less, and further preferably 15 degrees or less.

  The alcohol content of the chemical solution can be adjusted using a solvent such as water or other alcohol components so as to obtain a desired alcohol content based on the alcohol content of the brewed liquor used and the content of the brewed liquor.

  In the present embodiment, a carbon dioxide generator for generating carbon dioxide includes an organic gas supply unit that contains the chemical solution and generates organic gas, an ultraviolet irradiation unit that irradiates ultraviolet rays, and receives organic light by receiving ultraviolet rays. A photocatalyst portion having a photocatalyst sheet that decomposes to generate carbon dioxide gas.

  The organic gas supply unit generates organic gas. The organic gas supply unit has a chemical tank containing the chemical liquid of the present embodiment. Volatile organic compounds are volatilized from the surface of the chemical solution, but in order to increase the volatilization efficiency, a sheet table is installed on the chemical table, a fiber sheet is laid on the sheet table, and one end of the fiber sheet is placed on the sheet table. It is preferable to hang down and immerse in the chemical solution in the chemical solution basket. As the fibrous sheet, a cloth sheet such as a non-woven fabric is suitably used, and the chemical liquid is sucked from the chemical liquid basket into the fibrous sheet by capillary action. Thereby, the fibrous sheet is impregnated with the chemical solution. And the volatile organic compound (specifically alcohol, aromatic component) contained in the brewing liquor in a chemical | medical solution volatilizes from a fiber sheet as organic gas. When an additive is contained in the chemical solution as desired, the volatile component contained in the additive is also volatilized as an organic gas.

  The ultraviolet irradiation unit irradiates ultraviolet rays. For example, an ultraviolet lamp such as an ultraviolet LED is used as the ultraviolet irradiation unit. The ultraviolet irradiation unit is installed above the organic gas supply unit, specifically at a position facing the liquid level of the chemical solution in the chemical solution tank, and irradiates the organic gas supply unit with ultraviolet rays. Ultraviolet light having a wavelength equal to or shorter than the wavelength corresponding to the band gap of the photocatalyst carried on the photocatalyst sheet of the photocatalyst portion can be used. For example, when anatase-type titanium oxide is used as a photocatalyst, one having a wavelength of 388 nm or less corresponding to a band gap of 3.2 eV of anatase-type titanium oxide can be used.

  The ultraviolet irradiation unit has a plurality of ultraviolet lamps arranged at a predetermined interval on the lower surface of a substrate of a desired size (that is, the surface facing the organic gas supply unit) (for example, a 5 mmφ peak on the lower surface of a 10 cm × 10 cm board) 4 × 4 = 16 ultraviolet LEDs with a wavelength of 375 nm are arranged.), Lead wires are wired on the upper side of the board and led out to be led to the electric supply unit through the operation panel.

  The photocatalyst portion has a photocatalyst sheet that receives ultraviolet rays and decomposes organic gas to generate carbon dioxide gas. The photocatalyst sheet is laid between the organic gas supply unit and the ultraviolet irradiation unit. The photocatalyst sheet may be supported, for example, via a spacer so as not to directly contact the liquid level of the chemical liquid or the fiber sheet, and the height from the liquid level of the chemical liquid or the fiber sheet is, for example, 3 to 30 mm. Can be set at any interval between.

The photocatalyst carried on the photocatalyst sheet is not particularly _{limited, TiO 2, ZnO, SrTiO 3} , BaTiO 3, BaTiO 4, BaTi 4 O 9, K 2 NbO 3, Nb 2 O 5, Fe 2 O 3, Ta Examples include oxides such as ₂ O ₅ , K ₃ Ta ₃ Si ₂ O ₃ , WO ₃ , SnO ₂ , Bi ₂ O ₃ , BiVO ₄ , NiO, Cu ₂ O, RuO ₂ , and CeO ₂ . TiO ₂ (titanium oxide) is preferable because it is harmless and has excellent chemical stability. As the titanium oxide, any of anatase type, rutile type and brookite type can be used.

When the photocatalyst receives ultraviolet light, it is first photoexcited by its light energy, generating electrons and holes on the surface of the photocatalyst. Next, electrons reduce oxygen in the air and change it into superoxide ions (O ₂ ⁻ ), while holes oxidize moisture on the photocatalyst and change it into hydroxyl radicals (OH radicals). When an organic gas is deposited on the photocatalyst in such a photoexcited state, the superoxide ions desorb carbon from the organic gas, and hydroxyl radicals (OH radicals) desorb hydrogen from the organic gas, thereby decomposing the organic gas. These carbon and hydrogen are each oxidized and changed to carbon dioxide (carbon dioxide) or the like.

  The organic gas supply unit, the ultraviolet irradiation unit, and the photocatalyst unit are housed in a storage container, and the storage container has a window for volatilizing the generated carbon dioxide gas outside the container. In this embodiment, even if the carbon dioxide generator has a configuration in which the organic gas supply unit, the ultraviolet irradiation unit, and the photocatalyst unit are housed in the storage container, the organic gas supply unit, the ultraviolet irradiation unit, and the photocatalyst unit are provided. The stored storage container may further be configured to be stored in the outer container. Note that the outer container also has a window portion for volatilizing carbon dioxide generated by the photocatalytic reaction to the outside of the container.

  The carbon dioxide generator of this embodiment can be used as a mosquito trap, and when used as a mosquito trap, it is preferable to include a collection unit that collects mosquitoes attracted by carbon dioxide. Even if it has an outer container, the collection part may be provided inside the outer container adjacent to the storage container.

  As the collection part, for example, an adhesive sheet, an aspirator, and the like can be suitably used, but an adhesive sheet is preferable from the viewpoint of easy collection and replacement of collected mosquitoes and hygiene.

A method for attracting mosquitoes using the carbon dioxide generator of this embodiment will be specifically described.
The fiber sheet sucks up the chemical solution from the chemical solution tank and volatilizes the organic gas. When electricity is supplied to the ultraviolet irradiation unit by the electric supply unit, ultraviolet rays are irradiated toward the photocatalyst unit. When the photocatalyst of the photocatalyst sheet in the light irradiation part receives ultraviolet rays, active species such as hydroxyl radicals (OH radicals), superoxide anions, holes, and electrons are generated. These active species decompose the organic gas volatilized from the fiber sheet into carbon dioxide gas or the like. Carbon dioxide is released from the window of the storage container, or when the storage container is stored in the outer container, from the window of the outer container to the outside of the container, and mosquitoes attracted by carbon dioxide pass through the window into the container. invade. And the mosquito which invaded in the storage container or the outer container is collected in the collection part.

In the method for attracting mosquitoes of this embodiment, it is preferable to generate carbon dioxide using the above-described carbon dioxide generator and increase the carbon dioxide concentration per 100 L of space at 5 to 30 ppm / hr. By generating carbon dioxide so that the carbon dioxide concentration per 100 L of space is increased by 5 ppm per hour, the mosquito attracting range is expanded, so that mosquitoes can be attracted more efficiently. The higher the concentration of carbon dioxide, the greater the effect of attracting mosquitoes, but the higher the concentration, the larger the carbon dioxide generator (mosquito trap), The increase is preferably 30 ppm or less per hour.
In addition, since mosquitoes are easily attracted to a carbon dioxide concentration of 5 ppm or more, carbon dioxide may be generated so that the carbon dioxide concentration in the vicinity of the mosquito suction port of the mosquito trap is 5 ppm or more.

  The amount of carbon dioxide generated (carbon dioxide concentration) generated from the carbon dioxide generator (mosquito trap) can be adjusted by the alcohol content of the chemical solution, the ultraviolet irradiation intensity, the area and volume of the photocatalyst.

  Examples of the mosquitoes to be attracted by the method for attracting mosquitoes of the present invention include, for example, Akaika, Aedes albopictus, Chikaeka, Kodaaka Aikaeka, Aedes aegypti, Anopheles mosquito, Anetika, etc., but are not limited to these exemplified mosquitoes. .

  Hereinafter, although the mosquito attracting method of the present invention will be further described based on specific test examples, the present invention is not limited to the following examples.

<Test Example 1>
Using the olfactometer method, an attrition contrast test of sake and mosquitoes was conducted.
An olfactometer 10 as shown in FIG. 1 was used. The olfactometer 10 includes a pair of transparent specimen boxes (first specimen box 1A and second specimen box 1B), and a transparent cylindrical attraction connected to each of the first specimen box 1A and the second specimen box 1B. The parts 2A and 2B and the transparent mosquito storage box 3 connected to the attracting parts 2A and 2B are provided. The connecting part between the mosquito storage box 3 and the attracting parts 2A, 2B is provided with a check valve 4 that prevents the mosquitoes that have entered the attracting parts 2A, 2B from entering the attracting part 2A, 2B from entering the mosquito receiving box 3 again. ing. Clean air is allowed to flow through the olfactometer 10 to generate airflow at 0.3 m / s from the specimen boxes 1A and 1B toward the mosquito-containing box 3.

As sample 1, Japanese sake (Cooking sake “Sakana” (trade name, manufactured by Takara Shuzo Co., Ltd.), alcohol content 13.5 degrees) was used. 20 mL of sake was measured in a plastic cup (diameter 6 cm, depth 5 cm) and placed in the first specimen box 1A of the olfactometer 10.
As the specimen 2, a 13.5% ethanol aqueous solution was used. 20 mL of a 13.5% ethanol aqueous solution was measured in a plastic cup (diameter 6 cm, depth 5 cm) and placed in the second specimen box 1B of the olfactometer 10.
In the mosquito containing box 3, 30 adult females of Aedes albopictus were released and left for 24 hours. Mosquitoes attracted to the attracting part 2A connected to the first specimen box 1A and the attracting part 2B connected to the second specimen box 1B were counted. The test was performed three times and the average was obtained. The results are shown in Table 1.

<Test Example 2>
Using the olfactometer method, a mosquito attracting test of carbon dioxide generated using sake and sake was conducted.
The olfactometer 10 similar to that used in Test Example 1 was used for the attraction contrast test.
Further, a carbon dioxide generator 20 as shown in FIG. 2 was used to generate carbon dioxide. The carbon dioxide generator 20 includes an organic gas supply unit 5 in which the chemical solution 6 is stored, and a drive unit 9 positioned above the organic gas supply unit 5. The drive unit 9 includes an ultraviolet irradiation unit 7 including an ultraviolet lamp 72 mounted on the surface of the substrate 71, and a photocatalytic sheet 8 provided to face the ultraviolet lamp 72. The photocatalytic sheet 8 supplies organic gas. It is installed so as to face the part 5. The ultraviolet irradiation unit 7 includes a substrate 71 having a length of 5 cm × width 5 cm and an ultraviolet lamp 72 (9 pieces (3 rows × 3 pieces)) having a diameter of 3 mm and a peak wavelength of 365 nm, and leads connected to the ultraviolet lamp 72. A wire is drawn out from the back side of the substrate 71 and connected to the AC adapter 11. The carbon dioxide generator 20 configured as described above generates carbon dioxide when energized.

Carbon dioxide gas was generated by the carbon dioxide generator 20 using Sample 3 (Japanese sake, “Sakana” (trade name, manufactured by Takara Shuzo Co., Ltd.), alcohol content 13.5 degrees). 20 mL of the organic gas supply unit 5 of the carbon dioxide generator 20 was filled with sake, and the drive unit 9 was installed 3 cm above the liquid level of the chemical solution so that the photocatalytic sheet 8 was horizontal with the liquid level. Carbon dioxide was generated by energizing at 12 V and 0.08 A and irradiating ultraviolet rays, and the carbon dioxide gas was installed in the first specimen box 1 A of the olfactometer 10.
As a control sample 4, Japanese sake (Cake Sake “Sakana” (trade name, manufactured by Takara Shuzo Co., Ltd.), alcohol content 13.5 degrees, etc.) was used. 20 mL of sake was measured in a plastic cup (diameter 6 cm, depth 5 cm) and placed in the second specimen box 1B of the olfactometer 10.
In the mosquito containing box 3, 30 adult females of Aedes albopictus were released and left for 24 hours. Mosquitoes attracted to the attracting part 2A connected to the first specimen box 1A and the attracting part 2B connected to the second specimen box 1B were counted. The test was performed three times and the average was obtained. The results are shown in Table 2.

  From the results of Test Example 1, it can be seen that Japanese alcohol has a higher mosquito attracting property than Sample 1 in the comparison between Sample 1 and Sample 2. From the results in Test Example 2, the organic gas is compared in the case of Sample 3 and Sample 4. It was found that the attractiveness of mosquitoes was remarkably increased by using Japanese sake as a source of gas and generating carbon dioxide by decomposing organic gas.

<Test Example 3>
Using the olfactometer method, a carbon dioxide gas generated using sake and a carbon dioxide gas generated using whiskey were compared with mosquitoes.
The olfactometer and the carbon dioxide generator are the same as those used in Test Examples 1 and 2.

Carbon dioxide was generated by the carbon dioxide generator 20 using Sample 5 (Japanese sake, “Sake Sake” (trade name, manufactured by Takara Shuzo Co., Ltd.), alcohol content 13.5 degrees). 20 mL of the organic gas supply unit 5 of the carbon dioxide generator 20 was filled with sake, and the drive unit 9 was installed 3 cm above the liquid level of the chemical solution so that the photocatalytic sheet 8 was horizontal with the liquid level. Carbon dioxide was generated by energizing at 12 V and 0.08 A and irradiating ultraviolet rays, and the carbon dioxide gas was installed in the first specimen box 1 A of the olfactometer 10.
Carbon dioxide gas was generated by the carbon dioxide generator 20 using whiskey (“Suntory Whiskey Square Bottle” (trade name, manufactured by Suntory Holdings Ltd.), alcohol content 40 degrees) as a control sample 6. Carbon dioxide gas was generated in the same manner as the specimen 5, and was installed in the second specimen box 1B of the olfactometer 10.
In the mosquito containing box 3, 30 adult females of Aedes albopictus were released and left for 24 hours. Mosquitoes attracted to the attracting part 2A connected to the first specimen box 1A and the attracting part 2B connected to the second specimen box 1B were counted. The results are shown in Table 3.

  From the results in Table 3, sample 5 using sake (brewed liquor) has higher mosquito attractability than sample 6 using whiskey (distilled liquor), and sake has an aroma along with organic gas that generates carbon dioxide. It is thought that the mosquito attractability is improved by the ingredients.

<Test Example 4>
Using the olfactometer method, a mosquito attraction test of carbon dioxide generated using sake and carbon dioxide generated using a mixture of sake and ethanol was conducted.
The olfactometer and the carbon dioxide generator are the same as those used in Test Examples 1 and 2.

Carbon dioxide gas was generated by the carbon dioxide generator 20 using Sample Sake (sake for cooking “Sakana” (trade name, manufactured by Takara Shuzo Co., Ltd.), alcohol content 13.5 degrees). The organic gas supply unit 5 of the carbon dioxide generator 20 was filled with 20 mL of sake, and the driving unit 9 was installed 3 cm above the liquid level of the chemical solution so that the photocatalytic sheet 8 was horizontal with the liquid level. Carbon dioxide was generated by energizing at 12 V and 0.08 A and irradiating ultraviolet rays, and the carbon dioxide gas was installed in the first sample box 1 A of the olfactometer 10.
As a control sample 8, an alcohol mixture of sake and ethanol [Sake (sake for cooking “Sakena” (trade name, manufactured by Takara Shuzo Co., Ltd.), alcohol content 13.5 degrees) 69.4% by mass and 100% ethanol 30. Carbon dioxide gas was generated by the carbon dioxide generator 20 using 6 mass% mixed and adjusted to an alcohol content of 40 degrees]. Carbon dioxide gas was generated in the same manner as the specimen 7, and was installed in the second specimen box 1B of the olfactometer 10.
In the mosquito containing box 3, 30 adult females of Aedes albopictus were released and left for 24 hours. Mosquitoes attracted to the attracting part 2A connected to the first specimen box 1A and the attracting part 2B connected to the second specimen box 1B were counted. The results are shown in Table 4.

  From the results in Table 4, even if ethanol is mixed with sake and the alcohol concentration is increased to 40 degrees, mosquito attractability cannot be improved, and even if the ethanol concentration of the chemical supplied to the carbon dioxide generator is too high It was found that it does not contribute to attractiveness.

<Test Example 5>
Carbonated by a carbon dioxide generator similar to that used in Test Example 2, using sake (Cake Sake “Sakena” (trade name, manufactured by Takara Shuzo Co., Ltd.), alcohol content 13.5 degrees) in a 100 L acrylic box. Gas was generated.
When the carbon dioxide concentration was measured with a carbon monoxide carbon dioxide measuring device: MODEL CMCD-200 (trade name, manufactured by Gastec Co., Ltd.) at regular intervals, the carbon dioxide was 10 ppm after 1 hour as compared with the start of the test. After 2 hours, it increased by 17 ppm.

DESCRIPTION OF SYMBOLS 1A 1st sample box 1B 2nd sample box 2A, 2B Attraction part 3 Mosquito accommodation box 4 Check valve 5 Organic gas supply part 6 Chemical solution 7 Ultraviolet irradiation part 8 Photocatalyst sheet 9 Drive part 10 Olfactometer 11 AC adapter 20 Carbon dioxide gas Generator

Claims (4)

A method of attracting mosquitoes by decomposing organic gas with a photocatalyst and generating carbon dioxide gas,
A method for attracting mosquitoes, wherein a chemical solution containing brewed liquor and having an alcohol content of 1 to 50 degrees is used as a source of the organic gas.   The method for attracting mosquitoes according to claim 1, wherein the brewed sake is sake made from rice, water and rice bran.   The method for attracting mosquitoes according to claim 1 or 2, wherein the chemical solution contains 10% by mass or more of the brewed liquor.   An organic gas supply unit that contains the chemical solution and generates the organic gas, an ultraviolet irradiation unit that irradiates ultraviolet rays, and a photocatalyst unit that receives the ultraviolet rays and decomposes the organic gas to generate the carbon dioxide gas. The method for attracting mosquitoes according to any one of claims 1 to 3, wherein the carbon dioxide concentration per 100 L of space is increased by 5 to 30 ppm / hr using a carbon dioxide generator having

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