CH642230A5 - Dispenser for the application of pheromones - Google Patents

Description

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PATENT CLAIMS

1. Dispenser for the application of pheromones, characterized in that the pheromone is enclosed in a plastic film from 20 to 100 (in the wall thickness.

2. Dispenser according to claim 1, characterized in that the pheromone is applied to a porous support, preferably a sponge cloth, which is enclosed in the plastic film.

3. Dispenser according to claim 1 or 2, characterized in that the film consists of polyethylene, polyvinyl chloride, polyvinylidene chloride, polyamide or cellulose.

4. Dispenser according to claims 1, 2 or 3, characterized in that a solution of (S) -cis-verbenol in methylbutenol, preferably in a ratio of 1:10 to 1:30, is used as the pheromone.

5. Dispenser according to claims 1, 2 or 3, characterized in that the pheromone components are each welded in separately.

6. Use of dispensers according to claim 1 for combating bark beetles.

7. Use according to claim 6 of dispensers according to one of claims 2 to 5.

8. Use according to claim 6 or 7, characterized in that the dispenser is attached to spruce trunks or parts of spruce trunks and the attracted beetles are killed by chemical or physical means.

9. Use according to claim 8, characterized in that the trapping trees are treated with a chemical pesticide effective against bark beetles.

10. Use according to claim 9, characterized in that lindane is used as the pesticide.

The object of the invention is specified in the claims.

It is known that the compounds (S) -cis-verbenol of the formula

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and methylbutenol (2-methyl-3-buten-2-ol) in combination act as an attractant (pheromone) for bark beetles (book printer, Ips typographus).

For use as a pheromone, the active ingredient mixture must be formulated so that it is released from the formulation evenly over a period of at least 4 weeks. In addition, the amount and the ratio of the two components should be as constant as possible in the range in which the most favorable attracting effect is achieved. It has proven to be advantageous if 0.01-0.1 mg (S) -cis-verbenol and 0.5-2 mg methylbutenol are released per hour.

Up to now, pheromones have been used either to drill holes in polyethylene capsules or to use glass capillaries loaded with a solution of (S) -cis-verbenol in methylbutenol. This method of use has the disadvantage that the pheromone is released in an excessive amount and uncontrollably unevenly. In addition, there is a high workload because the phero-

must be refilled, otherwise the necessary delivery time will not be achieved.

As has now been found, the pheromone can surprisingly be applied at the desired delivery rate and for a sufficiently long time by enclosing it in a suitable type and thickness of plastic film. It was not foreseeable that the pheromone could be successfully deployed in this way, because between the components with regard to vapor pressure ((S) -cis-verbenol: Kp20 Torr 120 ° C; methylbutenol: Kp760TOrr 99 ° C) and also with regard to the molecular structure there are significant differences.

Plastic films suitable for wrapping can consist, for example, of polyvinyl chloride, polyamides, polyvinylidene chloride cellulose and, above all, of polyethylene and have a thickness of 20-100 μm. Common composite films, e.g. based on cellulose / polyvinylidene chloride or polyvinylidene chloride / polyvinyl chloride can be used. The pheromone is expediently applied to an absorbent carrier, for example on a sponge cloth.

An application unit according to the invention (“dispenser”) can be manufactured, for example, by placing a 6 x 4 cm 2 in a piece of a hose made of high-pressure polyethylene (wall thickness approx. 50 (diameter approx. 5.5 cm), approximately 9 cm long , a piece of sponge cloth several millimeters thick, soaked in pheromone solution, one weld seam is at the end of the hose, the other is about 1.5 cm away from the other end of the hose, resulting in a tab for attaching the dispenser The solution of 100 mg (S) -cis-verbenol in 1900 mg methylbutenol per dispenser is preferably used as the pheromone The biological effect lasts for at least 8 weeks, the delivery rate is approx. 0.025-0.04 mg / Hour for (S) -cis-verbenol and approx. 1.0-2.2 mg / hour for methylbutenol at a constant temperature of 25 ° C.

Instead of the 1:19 quantitative ratio used here, the two components can be used in other ratios, for example between 1:10 and 1:30.

The components of the active ingredient combination can also be welded in separately in the same way. By using different types of foils or foils of different thicknesses, the release rate and the release ratio can be changed if desired.

For storage, the dispensers are appropriately sealed in aluminum bags to prevent an annoying loss of pheromone.

The means according to the invention are used, for example, in such a way that one or more dispensers in spruce cultures are attached to a spruce trunk at the beginning of the flight time of the beetles. Instead of spruce trunks, logs about 2 m long, including rotten wood or wood debarked by game, can also be used as a catch tree. Devices designed as traps can also serve as carriers for the dispensers.

To kill the bark beetles, the catch trees are expediently treated with an insecticide which is effective against the beetles, for example with lindane.

A comparison test in spruce cultures showed that with the dispensers according to the invention, as much bark beetles were attracted over a period of 8 weeks under the same conditions as with the previously known capsules with pheromone solution. However, they had to

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Capsules can be refilled with pheromone solution in the fifth week.

In an experiment with one of the dispensers described above (1900 mg methylbutenol / 100 mg S-cis-verbenol) 6729 bark beetles were attracted and caught in the observation period.

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When 2000 mg of methylbutenol and 50 mg of crystalline S-cis-verbenol were sealed separately in 50 μm thick polyethylene film (delivery at a constant temperature of 25 ° C: 18-35 (ig / hour), the number of bark beetles caught in the same period was 5220.

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