DE19947146A1 - Use of substrates impregnated with selected insecticides, e.g. transfluthrin, to control flying insects indoors at room temperature - Google Patents

Abstract

Substrates impregnated with 0.05-2 mg/cm<2> of an insecticide selected from transfluthrin, pynamin forte, vaporthrin and prallethrin are used at room temperature to control flying insects indoors.

Description

The present invention relates to the use of insecticide-soaked carriers for Control of flying insects, primarily for controlling flies and Mosquitos. The carriers used allow the volatilization of the Insecticides without the need to apply heat by heating.

It is known that to kill insects, for. B. mosquitoes, with the help of electric heaters e.g. B. so-called platelet evaporators can be used can. In this process, suitable substances, such as. B. pulp and Cotton cardboard, asbestos, ceramics and / or porous synthetic resins with insecticides Active ingredient solutions impregnated, whereby insecticide flakes are obtained. The Insecticides are caused by the effect of a heater that has a temperature of Generated 120 to 190 ° C, evaporated.

A major disadvantage of these platelet evaporators is that they are unfavorable Relationship between energy expenditure and the amount of active substance to be evaporated, since the Proportion of active ingredient in relation to the necessary auxiliary substances to be regarded as low are. Furthermore, the high working temperature and the way it works Vaporizer that the active ingredients are not always very over the intended duration of action be delivered evenly. The duration of action of these evaporator plates is therefore often limited.

For a long time, vaporizer devices for household use have been known, like them are described for example in GB-PS 2 153 227; here the Ver vaporization of a solution, the active ingredient e.g. B. saturated in a mixture, aliphatic hydrocarbons is solved by means of an electrically heated wick tes.  

The required in these so-called liquid evaporators, in relation to the active Substantial amount of organic solvent results in the product application to an undesirably high concentration of solvent in the room, what u. a. to pollution - often claimed by consumers - of Walls and objects in the vicinity of these devices.

Also known is the evaporation of insecticides using electrical be powered fans that have an airflow over one with an insecticidal Blow the drug solution impregnated carrier. Such Ventilatorsystemem z. B. described in WO 96/32843.

From EP-PS 279 325 (= US 4,889,872) are transfluthrin-impregnated natural and synthetic fabrics, e.g. B. also moth papers known. In addition, the Use of transfluthrin for mosquito coils mentioned.

The object of the invention was to be used indoors, over meh to provide effective insecticide preparations for a few weeks which are volatile administration of the active ingredient at room temperature, d. H. without heat input (such as through Heaters), in a way that, on the one hand, allows flightable insects such as Reliably kills flies and mosquitoes, but in the air none for Mammals and humans cause adverse drug concentration.

The carriers of the present invention to be used according to the invention effect the volatilization of active ingredients without any electrical energy heat the carrier or to operate a fan and show a killing Effect against flyable insects, such as. B. mosquitoes or flies, up to one Duration of action of several weeks.

The invention thus relates to the use of carriers which are impregnated with 0.05 to 2, preferably 0.1 to 1, in particular 0.2 to 0.8 mg / cm ^{2 of} active ingredient from the series transfluthrin, pynamine forte, vaporthrin, prallethrin are, at room temperature for the control of flightable insects indoors.

On the one hand, the volatility of the insecticidal active substances mentioned is large enough without volatilizing heat, but on the other hand sufficiently low to produce a to achieve sufficient duration of action.

Transfluthrin (I), the z. B. is known from EP-PS 279 325, is a particularly suitable active ingredient.

The impregnated supports to be used according to the invention can be used with all common impregnation methods are provided, provided the carrier during the impregnation nation is not damaged, for example by spraying the carrier with a Solution of the insecticide and subsequent drying, e.g. B. in the air, or by Dip the carrier in an insecticide solution and then dry, e.g. B. on the air.

All absorbent materials can be used as carrier materials. Well suited are textile materials, papers and other pulp products. Nature is preferred fibers such as B. cotton, synthetic fibers such. B. polyester and polyamide, as well Paper in smooth, folded or corrugated form, especially cotton, poly ethylene terephthalate fibers and paper. Suitable paper is e.g. B. in EP-A- 576 270.  

The shape of the carrier materials can use the effect of the invention influence the wearer. Surfaces around which air flows are particularly suitable Posters, corrugated or folded paper, open paper pyramids, fan shapes or Pagodas.

Good results in the sense of the invention result if the supports to be used according to the invention have surfaces in the range from 1200 to 3000, preferably 1500 to 3000, in particular 2000 to 3000 cm ² . The information relates to rooms with an area of up to 40 m ² corresponding to volumes of up to 100 m ³ .

The carriers to be used according to the invention can also be natural and / or contain synthetic fragrances as well as organic and inorganic dyes.

The percentages in the following examples relate to the Weight.  

Examples example 1 Impregnated materials

The following materials were clamped on two sides in a horizontally mounted tripod. A transfluthrin solution was sprayed twice from the top and bottom with a spraying machine and then dried in a strong draft:

Example 2 Poster impregnated with transfluthrin based on moth paper

The following posters were created using the method mentioned in Example 1 and the evaporation rates were determined:

Example 3 Testing of insect strips for insecticidal activity against flying insects of different species in 34 m ³ rooms with the window closed

The tests are carried out in rooms measuring 4.49 m × 2.85 m × width Height 2.66 m.

In the empty rooms, the strip is placed in the middle of the ceiling at a height suspended from 2.15 m. One meter from the broadsides, at a height of 2 m, cords are stretched, hung on the wire baskets with test animals become. The rooms are ventilated for 30 minutes every day, except on weekends (on the day of the test after completion of the 7 hour test, the test animals in stay in the rooms). The doors are closed.

In the morning, 2 wire baskets with 20 test animals (3 to 4 days old) are put into the room hanged. More animals are hung in the room every hour for up to 6 hours.

The knock-down effect is evaluated for up to 7 hours. Is determined the time in which 50% and 100% of the animals fell on their back (KT = knock down time). This is achieved by observing the animals from the outside (window in the doors) and when the effect begins, by entering the rooms. 24 hours mortality is determined after the start of the experiment.

Method deviation

The rooms are not ventilated during the test. The knock-down effect is evaluated for up to 9 hours.

In addition to the caged animals, 40 Culex mosquitoes and 40 sensitive houseflies released in the rooms and knock-down effect checked.  

The following tables show the biological effectiveness of the product Example 2E against mosquitoes of the species Aedes aegypti (susceptible) and Culex quinquefasciatus (DDT-resistant) and house flies of the species Musca domestica.

Table 1

Insecticidal activity of transfluthrin-impregnated moth paper against mosquitoes in cages of the species Aedes aegypti (susceptible) and Culex quinquefasicatus (resistant) and susceptible houseflies from the Who [N] F 473 strain.
Room temperature: 22 to 30 ° C
relative humidity: 18 to 43%

Claims (6)

1. Use of carriers which are impregnated with 0.05 to 2 mg / cm ^{2 of} active ingredient from the series Transfluthrin, Pynamin forte, Vaporthrin, Prallethrin, at room temperature to control flyable insects indoors. 2. Use according to claim 1, according to which the carriers are impregnated with 0.1 to 1 mg / cm ^{2 of} active ingredient. 3. Use according to claim 1, after which the carriers are impregnated with 0.2 to 0.8 mg / cm ² . 4. Use according to claims 1 to 3, after which the carrier made of cellulose products and textile materials is selected. 5. Use according to claims 1 to 4, according to which the active ingredient is transfluthrin is. 6. Use according to claims 1 to 5 for combating flies and Mosquitos.