DE2933757A1 - Z(II)-Tetra:decenyl-acetate insect attractant for trotrix viridana - lures the male insects reducing mating and is opt. used with a conventional insecticide - Google Patents

Abstract

An agent for attracting and controlling Trotrix Viridana contains Z(11)-tetradecanylacetate (I) as active ingredient. (I) can be used in combination with a conventional insecticide to kill the lured insects. (I) attracts the male insects, causing disorientation, confusion and reducing mating.

Description

Insect attractants for the oak moth Tortrix viridana

When looking for new, especially environmentally friendly, methods of the For some years now, insect attractants (pheromones) have been used for pest control found increasing interest. Their advantage lies in the field of crop protection in their extraordinary selectivity, each only in a single way, if need be is directed towards a narrowly limited number of species, while other species are unaffected leaves. It is therefore possible with the help of pheromones.

a certain type of pest "aims to combat. without the ecological one Disturbing balance more than necessary.

Pheromones are excreted and exerted by numerous insects other individuals of the same species emit a certain signaling effect. In particular This is true of the sex pheromones produced by the females of a species of insect we: den to attract the males of the same species for the purpose of copulation. This This phenomenon can be used in pest control in three ways make: 1. by laying out scented baits, which the males over long distances attract a species of pest so that they can be in place by conventional means can be destroyed in a targeted manner ("interception technique"); 2. by areal Application of relatively high concentrations of the pheromone, thereby reducing the amount of pheromone to be suppressed Insect population is disoriented and prevented from joining the population ("confusion technique"); 3. By setting up traps to determine the density of a pest species in a certain area and thus the most favorable time to combat it with conventional methods ("monitor technology").

In the economically significant damage sects in the group the Tortriciden (winder) belongs to the oak winder in the Central and Southern European forest Tortrix viridana. It occurs at irregular intervals in mass multiplication, which may make control necessary E. Schwenke the forest pests of Central Europe " Paul Parey Publishing House, Hamburg / Berlin, 19787.

It has therefore been tried for a long time from the forestry side Develop forecasting methods that reflect the impending build-up of a pest population indicate early in order to be able to take suitable countermeasures.

For some years now, the degree of infestation of Tortrix viridana counts the number of eggs laid on branches or by the females used to count caterpillars on oak trees. However, this is very time consuming and only possible by trained staff.

A more rational and effective way of predicting pest infestation, which possibly enables targeted control of the pests was not previously known.

For this purpose, it is possible to detect the butterfly by means of sexual pheromone traps which makes it easy to determine the presence of the butterfly and an indication of the severity of the infestation and the time of control via the traps to win [Jacobsen, M .: Insect-ex-Pheromones, Academie Press New York / London, 19727. The sexual attractant of Tortrix viridana was not yet known.

It is known, however, that the pheromones of Tortriciden are predominantly from simple derivatives, especially alcohols and acetates of nono- or dienes medium chain length exist [Tetrahedron 33, 1845 ff. (197727.

In order to solve the problem on which the present invention is based, were therefore a number of aliphatic in a large-scale screening Alcohols and aldehydes on their selective attractiveness for Tortrix viridana tested in baited glue traps.

It was found that the Z (11) tetradecenyl acetate selectively and highly specifically attracts the male age of Tortrix viridana.

It was already known to use Z (11) tetradecenyl acetate as a pheromone occurs in some tertricids [Y.Tamaki; in "Chenuical Control of Insect Pehaviour" John Wiley and Sons, New York-Loncon-Sydney-Taronto, 19777. The alluring effect however, on Tortrix viridana was not known.

The invention thus provides means for attracting and combating from Tortrix viridana, which are characterized by a content of Z (II) -tetradecenyl acetate.

Z (li) -Tetradecenyl acetate is a known compound, which according to according to the literature (left J. Bestmann et al., Chem. Ber., 111: 248 (1978)).

Both liquid as well as solid preparations are suitable. The solvents used are high-boiling, aromatic, aliphatic or cycloaliphatic compounds are suitable. Next to Esters, ethers or ketones are particularly suitable for hydrocarbons. Typical Representatives of these classes are z. 13th

Xylene, methylnaphthalene, paraffin oils, cyclohexanone, ethyl glycol acetate, Isophorone and dibutyl phthalate. These solvents can be used alone or in mixtures find use with other components.

Furthermore, solutions can be made in French, animal or synthetic Oils or fats and other evaporation-inhibiting solvents with low Vapor pressure (such as

Dioctyl phalate) for the purpose of changing the effect Furthermore it is possible to use the active ingredient in or to natural or synthetic solid carriers such as rubber, cork cellulose, plastic, ground coal, wood flour, silicates, To bind pumice, baked clay or similar solid carriers or in special Use capsule formulations or plastic containers to ensure even To achieve release into the air over longer periods of time.

In addition, the active ingredient can be taken from suitable containers (capillaries or other vessels) are brought to evaporation through narrow openings, causing over Particularly uniform fragrance concentrations over longer periods of time aims will.

The active ingredient content of this preparation can continue within Boundaries fluctuate. In general, the ratio of active ingredient: additive in the range from 10: 1 to 1: 106.

In capsule formulations or other suitable containers, e.g. B. the active ingredient can be used in pure, undiluted form and its weight fraction, based on the total formulation, be very high and amount to up to 90%.

In general, however, very low concentrations of active ingredient are sufficient in the preparations to attract male Tortrix viridana. An active ingredient: additive quantity ratio of 1: 100 to 1 105 is preferred.

The agents according to the invention can be used in various ways will. Z. rs. one can lay out traps impregnated with a formulation of the same are. This can be used to determine the exact population density of Tortrix viridana and, as soon as this has reached a critical limit, combat with conventional ones Carry out methods.

Formulations with low volatility are best suited for this method Additives that release the active ingredient in a protahed manner, such as rubber, cellulose, wax, Polymers or evaporation-inhibiting, low-volatility oils or parafins, as well as Formulations in capsules or other containers (capillaries) that contain the attractant release either through their walls or through narrow openings. The active ingredient concentration is generally in the range from 1 100 l to 1:10 l1an can also combine the active ingredient with a contact or feeding insecticide and in this way destroy the attracted males directly. The drug concentrations are in the same order of magnitude as above.

Finally, the active ingredient can also be used in comparatively high concentrations spread to the males by disorientation and confusion in the mating prevent.

For this purpose, formulations with higher active ingredient contents are generally used (10: 1 to 1: 3,000) are used.

The invention is demonstrated by the following series of screening tests: Glue traps with inserted rubber baits, each weighing approx. 500 mg, each with 1 mg of a test substance were impregnated in one of Tortrix viridanabefallenen Oak forest hung out.

A total of 186 different test substances from the series of mono- or polyunsaturated alcohols with 10 to 16 carbon atoms, their acetates and the corresponding aldehydes were tested in this way for their attracting effect on T. viridana. At the end of the series of tests, the result was the following: Table Test substance animals / trap Z (11) -Tetradecenyl Acetate 195 185 other 0 Further tests with bait with different amounts of doping showed that the attracting effect can still be demonstrated up to a concentration limit of only 3 / g rg substance / bait.

Claims (3)

Claims: 1. Means for attracting and combating Trotrix viridana (oak moth), characterized by an effective content of Z (11) tetradecenyl acetate as an active ingredient. 2. Means according to claim 1, d. G. that they also have other conventional ones Contains insecticides. 3. Use of Z (11) tetradecenyl acetate for attracting and controlling by T. viridana.