JP4151812B2 - Pest control method by fake egg transportation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for effectively introducing active compounds into termite nests.
[0002]
[Prior art and problems to be solved by the invention]
There is a method for killing termites by injecting a solution-type drug into an intrusion site. However, this method has only a temporary effect and required a large amount of chemicals to penetrate the wood sufficiently. Furthermore, if only the damaged part is removed, the termites will change the passage and move the damage to other parts, which makes the removal more difficult. Frequently practiced is fumigation using methyl bromide. However, methyl bromide is a causative substance of the ozone layer depletion, and in recent years there has been an increasing trend to restrict its use. There is a method of exterminating ants that live in the same way as termites, such as mixing the ant's favorite food with poisons as food, and bringing it back to the nest to kill the entire population. However, since termites feed on the nesting wood itself, it is not possible to apply a method of transporting drugs from the outside of the nest to the inside of the nest using poisonous bait.
[0003]
[Means for Solving the Problems]
As a result of studying a method for efficiently introducing an active compound into a termite nest, the present inventor focused on termite egg recognition and egg transport behavior, and used an egg recognition substance extracted from an egg as a base material imitating an egg. I found a method to efficiently transport it into the nest by applying it, and found this book. Termite ants have the property of taking care of the eggs born by transporting them in piles and licking the surface of the eggs. A craft ant has a size and shape similar to a termite egg, recognizes a pseudo egg containing an egg recognizing substance on the surface as an egg, and carries it into its own egg mass in the nest. It is possible to efficiently destroy the reproductive center of the colony by containing an active compound such as an insecticidal active compound or a hatching inhibitor in the simulated egg and transporting it into the egg mass. The present inventor has also discovered a new species of Aceria sp. Nov., Which forms a sclerotia mimicking the eggs of Yamato termites and co-exists in the egg mass. The filamentous fungus can grow and nucleate on a PDA (potato-dextrose agar) medium, and the sclerotium obtained by culturing contains an active compound and an egg recognizing substance and can be transported to termites. Is possible.
[0004]
DETAILED DESCRIPTION OF THE INVENTION
In order for a termite to recognize an object other than a termite egg as an egg and transport it into the nest, it is necessary to physically and chemically resemble the object. In the present invention, a molded body having a spherical shape having a diameter of 0.3 to 0.45 mm or a mycelium is used as a base material, and the surface containing a termite egg recognition substance is used as a pseudo egg. An actual termite egg has a long egg shape, and a long egg shaped pseudo egg may be used, but a spherical shape is easier to form.
[0005]
As a method for incorporating a termite egg recognizing substance into a base material, an egg mass is collected from a termite nest, an egg surface material is extracted using ether as a solvent, and this is impregnated and applied to the base material. The egg recognition substance extracted from the termite egg has the same effect on the termite. This pseudo egg is injected into a termite ant canal or into an intrusion site and transported to a craft ant. Once the transport is started, the artificial ants are transported one after another so that the mimetic egg can be efficiently introduced into the center of the nest.
[0006]
There are various materials suitable as the base material for producing the simulated egg used in the present invention. For example, in addition to thermoplastic resins such as polyethylene, polypropylene, polystyrene, polyester, polyvinyl chloride, and polycarbonate, or thermosetting resins such as urea resin, epoxy resin, phenol resin, and polyurethane, porous gelation such as silica gel Agents, glass and the like. A material obtained by molding these materials into a spherical shape having a diameter of 0.3 to 0.45 mm can be used as a base material for a pseudo egg. Alternatively, sclerotia obtained by artificial culture of termite symbiotic sclerotia can be used as a substrate. Suitable materials are not limited to these examples, but materials whose material specific gravity is significantly different from eggs are not transported.
[0007]
The mimetic egg used in the present invention can contain an active compound as long as the transport rate is not impaired. Examples include pyrethroid compounds, organophosphorus compounds, carbamate compounds, N-aryldiazole compounds, hydrazone compounds, sulfonamide compounds, natural insecticidal component compounds, as well as hatching inhibitory substances, juvenile hormone-like substances, etc. And other insect growth control substances. Examples of the method of incorporating the active compound in the pseudo egg include a method of kneading into a resin or the like, or impregnating and applying to a porous body.
[0008]
【Example】
Next, although the manufacture example and test example of the pseudo egg of this invention are shown, this invention is not limited only to the following examples.
[0009]
Production Example 1 (pseudo egg based on mycorrhiza): 94.0% by weight of jetyl ether was added to 6.0% by weight of a termite egg, and ultrasonically washed for 1 minute. This was filtered to remove the egg to obtain an egg surface substance extraction solution (1). After adding 96.5% by weight of the egg extract solution (1) to 3.5% by weight of the termite symbiotic sclerotia obtained by culturing in the PDA medium, the ether solvent is volatilized to remove the egg on the surface of the sclerotia. A recognition substance is attached.
[0010]
Production Example 2 (Pseudo Egg Based on Glass Beads): Egg Extract Solution (1) described in Production Example 1 to 12.5% by weight of glass beads having a diameter of 0.4 mm (manufactured by Reciprocal Chemical Glass Co., Ltd.) After adding 87.5% by weight, the ether solvent is volatilized to attach the egg recognizing substance to the surface of the glass beads.
[0011]
Comparative example (when sea sand is used as a base material): 30 mesh sea sand (manufactured by Wako Pure Chemical Industries, Ltd.) 7.0% by weight, 93.0% by weight of egg extraction solution (1) described in Production Example 1 After the addition, the ether solvent is volatilized to attach the egg recognition substance to the surface of the sea sand.
[0012]
Test example: 20 termite eggs and 20 simulated eggs obtained in Production Example 1 were randomly sprinkled on a petri dish with a diameter of 9 cm, and 30 termite ants were placed in this, and allowed to stand in a constant temperature room at 25 ° C. for 15 hours. I put it. Professional ants gathered eggs scattered on the petri dish to form egg masses. When the egg mass was examined after 15 hours, 90% or more of the mimetic eggs were transported into the egg mass. When the carrying rate of the simulated eggs obtained in Production Example 2 and Comparative Example was examined by the same test method, the simulated eggs of Production Example 2 were transported by 40% or more, but the simulated eggs of Comparative Example were not transported at all. . Further, when 50 pseudo eggs obtained in Production Example 1 were injected into the ant canal formed by termite colonies bred indoors, after 24 hours, over 80% of the pseudo eggs were carried into the egg mass in the nest.
[0013]
【The invention's effect】
According to the present invention, an artificial object can be efficiently transported into a pest nest for the purpose of pest control.
[0014]
[Sequence Listing]

Claims (5)

The mimetic eggs comprising the additional inclusion of egg recognition substance termite egg shape and size of the termite to a substrate that mimics given to termites, a method of using an egg conveyance behavior is delivered into the nest. The method according to claim 1, wherein the simulated egg contains an active compound and is used for extermination of termites . A method of giving a termite a sclerotia formed by a symbiotic mycorrhizal fungus to a termite and transporting it into a nest using egg transporting behavior. The above termite symbiotic sclerotia is a sclerotia belonging to the genus Atheria that coexists in the nests of Yamato termite (Reticulitermesperatus Kolbe) and forms sclerotia having a diameter of 0.2 to 0.6 mm The method according to claim 3. The method according to claim 3 or 4, wherein an active compound is contained in the sclerotia and used for extermination of termites.