Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Biocides; animal or insect repellents or attractants
Patent
1997-02-10
2000-11-07
Levy, Neil S.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Biocides; animal or insect repellents or attractants
424405, 514461, 514531, A01N 2510, A01N 5300
Patent
active
061433136
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an insect pest control method. More particularly, it relates to an insect pest control method, especially flying insects, using a preparation-retaining material comprising a carrier having supported thereon a preparation containing a pesticidal component which is hard to vaporize at normal temperature, in which the pesticidal component is released from the preparation-retaining material by making use of an air current raised by a blower means under non-heating conditions; an apparatus suitable therefor; and a carrier constituting the preparation-retaining material.
BACKGROUND ART
A great number of pesticidal preparations have been proposed, and a proper preparation is selected therefrom for practical use in accordance with the insect to be controlled. In particular, preparations containing a vaporizing pesticidal component, i.e., those having a high vapor pressure at normal temperature have been used for flying insects such as mosquitos. The problem in using vaporizing components is that the preparations tends to vaporize and lessen its effect before use, for example, during storage. In order to prevent a preparation from vaporizing during storage and to let the preparation be released in a necessary concentration upon use, insect pest control has been carried out frequently by vaporizing a preparation under heating conditions. The pesticidal components contained in this type of preparations which are used under heating conditions usually have a vapor pressure of 1.times.10.sup.-3 mmHg or lower at 30.degree. C.
As an example of insect pest control by vaporizing a preparation under heating conditions, it is cited that a mosquito coil is a spiral coil molded from a kneaded mixture of a preparation and a slow-burning support, which is lit up and burnt whereby the preparation is vaporized by the heat. Pesticidal components useful for mosquito coils include pyrethrin, allethrin, and empenthrin. A mat type or liquid type electric mosquito control apparatus comprises an appropriate support impregnated with a preparation containing a pesticidal component, a part of the impregnated support of which is heated with a heater and the like to release the preparation. Pesticidal components useful for these types include allethrin, furamethrin, and prallethrin. Pesticidal components used in preparations for fumigation or evaporation which release a preparation in a short time period by heating with a heat source, such as heat of combustion or chemical reaction, include methoxadiazone, permethrin, and dichlorvos (Kateiyo Sacchuzai Gairon, Japan Sacchuzai Kogyokai (1991)).
Methods for forcibly vaporizing a preparation by ventilation are known. To cite an example, JU-A-55-954 (unexamined published Japanese utility model application) discloses a pesticidal apparatus having put therein a sublimating insect repellent, such as naphthalene, which inhales outer air through a hole to make the vaporizing component of the repellent vaporize and discharges air containing the vapor through a venting hole. Furthermore, a method for killing insects in which a diffusing material retaining a normal temperature vaporizing preparation, which is shaped into, e.g., a fan, is driven by a driving means to diffuse the vaporizing preparation is also known. This method, although regarded as one method for vaporizing a preparation under non-heating conditions, is considered to be effective when applied to preparations having relatively high vaporizability.
In the above-cited example of the method for vaporizing a preparation by ventilation, it is described that the air to be blown should be hot air when a pesticidal preparation whose vapor pressure ranges from 1.times.10.sup.-3 mmHg to 1.times.10.sup.-6 mmHg at 30.degree. C. is used.
Spraying with aerosol is the only known means for diffusing a pesticidal component having a vapor pressure of 1.times.10.sup.-3 mmHg to 1.times.10.sup.-6 mmHg at 30.degree. C. in space under non-heating conditions for insect control.
For control of flying insect pests
REFERENCES:
patent: 3336694 (1967-08-01), O'Connell
patent: 4282673 (1981-08-01), Focks et al.
patent: 4310985 (1982-01-01), Foster et al.
patent: 5091423 (1992-02-01), Wilson et al.
Mount et al : Mosquitoe News (1975), 35(1), 63-6 Toxicity of Pyrethroid & Organophosphorus Adulticides to 5 Species of Mosquitoes.
Ito Tatsuei
Suzue Mitsuyoshi
Yamaguchi Masanaga
Earth Chemical Co., Ltd.
Levy Neil S.
LandOfFree
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