CS213311B2 - Evaporator for application of the ferromons - Google Patents

Abstract

A dispenser for the application of pheromones contains the pheromone enclosed in a plastic film with a wall thickness of 20 to 100 mu m. The pheromone is expediently attached to a porous carrier. The dispenser allows a uniform release of active substance over a period of at least four weeks. The dispenser is used for controlling bark beetles.

Description

The invention relates to evaporators for the application of pheromones.

Compounds of (S) -cisverbenol are known to be of formula

HO and methylbutenol (2-methyl-3-buten-2-ol) act as bait (pheromone) for bark beetles (Ips typographus).

For the use of pheromones, the active mixture must be formulated such that it must be uniformly released from the formulation during at least 4. weeks. In addition, the amount of the two components and their ratio to each other must, as far as possible, be constant to the extent that the most attractive attraction is achieved. It has been found to be advantageous to release from 0.01 to 0.1 mg of (S) -cis-verbenol and 0.5 and 2 mg of methylbutenol per hour.

Until now, polyethylene capsules made of polyethylene tubes or glass capillaries that have been filled with a solution of (S)-cis-verbenol in methylbutenol have been used to release pheromones. This embodiment has a disadvantage. in that the pheromone was released in too large an amount, uncontrolled and uneven. In addition, this method was too laborious because the pheromone solution had to be replenished because the necessary time to release the pheromone was not reached.

Surprisingly, it has now been found that the pheromone can be dosed, surprisingly - at the required dose and for a sufficiently long period of time - by closing the plastic sheet of the appropriate type and strength. It could not have been assumed that pheromone could be dosed in this way, since there is a significant difference in the (S) -cis-verbenol tensi- tion between the two components - boiling point - -120 ° C - at 2.6 -kPa - and methylbutenol 99 ° C, 101 - kPa - and also - due to substantially different molecular structures.

Accordingly, the present invention provides a pheromone pro-vaporizer, characterized in that it comprises a plastic film having a wall thickness of 201 to 100 m in which a pheromone is deposited on a porous support, preferably a sponge-like material.

The plastic film suitable for use according to the invention may be of polyvinyl chloride, polyamide, polyvinylidene chloride and in particular of polyethylene, and its thickness is from 20 to 100 [mu] m. Mixed films based on cellulose α-polyvinylchloride are also useful

2133% of the chloride or the poles of vinyl chloride and polyvinyl chloride. The pheromone is preferably applied to ϊ. a carrier, for example a sponge-like substance. '

The application unit according to the invention. steamer, "was prepared so that about 9 cmdlóu- / ¹ 'nd piece from high density polyethylene tube (wall thickness 50 and μτα průměr.asi 5.5 cm) fused to the spongy substance of 6 x 4 cm ^2. several. . millimeters thick, connected with a pheromone solution .; One fused weld is at the end of the tube and the other has about 1.5 cm gap from the other end of the tube. This creates a coupling for fastening the evaporator. A solution of 100 mg of (S) -cis-verbenol in 1900 mg of methylbutenol per evaporator is used as the pheromone. The biological effect is maintained at least _; after 6 weeks. At constant temperature, an amount of from 0.025 to 0.04 mg / h of (S) -cis-verbenol and about 1.0-2.2 mg / h of methylbutenol is released. Instead of the 1: 19 ratio used herein, both components may be used - at a different ratio - between 1:10 and 1:30.

The active ingredient components may also be used separately in the same manner; By using-. · Various. For example, the evaporation and evaporation ratio can be appropriately changed in the case of the type of foil or foil of different thickness.

For storage. se. evaporator with advantage - Seal in an aluminum bag to prevent loss of pheromone evaporation.

Claims (3)

1. A pheromone application evaporator, characterized in that it consists of a plastic sheet having a wall thickness of 20 to 100 .mu.m in which the pheromone deposited therein is placed. on a porous carrier, p. preferably on a sponge-like substance. . 2. Evaporator according to claim 1, characterized in that it consists of a polyethylene, polyvinyl The evaporator according to the invention is used in such a way that:. that - - one - or more - evaporators are placed on one - spruce tree trunk - - downstream - metal cultures at the beginning of the bark beetle flight. Instead of “spruce trunks, they can also be used as a claw - trees - - -2 - m - long trunks or rotten or game-damaged wood. Modified traps may also be used as supports for the evaporator. ·. Trapwood trees are preferably treated with an effective insecticide suitable for bark beetle control, such as Jindan, to control bark beetles. In a comparative experiment in emery ball, it turned out that the evaporator according to the invention attracted the same amount of bark beetles over 6 weeks under the same conditions as with known capsules containing a pheromone solution. - -Let's go. however, on the fifth day on nit fill a new pheromone solution. In the experiment with the evaporator described above - - - - (1906 mg - methylbutenol - and - 100 mg - (S) -cis- 6,729 bark beetles were lured and caught. If used - separately -2000 mg methylbutenol - and - 50- mg crystalline (S) -cis-verbenol in 50 μτα polyethylene film (secreted at 25 ° C 16 to - 35 - (Ug. 5 220 bark beetles were lured in the same period. OF THE INVENTION chloride, polyvinylidene chloride, polyamide or cellulose. Evaporator according to Claims 1 and 2, characterized in that it contains, as pheromone, a solution of (S-cis-verbenol in methylbutenol, preferably in a ratio of 1:10 to -1:30).