FI74585B - ANVAENDNING AV (Z, E) -9,11- TETRADECADIENYLACETAT FOER OBSERVATION OCH BEKAEMPNING AV MOTTFJAERIL. - Google Patents

Description

The present invention relates to (Z, E) -9,11-tetradecadienyl acetate for the detection and control of moths. The present invention relates to (Z, E) -9,11-tetradecadienylacetates for the observation and control of moths. use of tetradecadienyl acetate for the detection and control of moths belonging to the genus Dioryctria, namely Dioryctria abietella.

Biological methods of controlling pests, and in particular the use of so-called pheromones, have aroused great interest in the last few decades. Pheromones are species-specific fragrances with which animals, like insects, communicate with each other and trigger a behavior or biological activity. For several years now, a few pheromones have been marketed to control certain pests on a commercial scale. The advantages of using pheromones for this purpose are their high selectivity and, consequently, their environmental friendliness. The difference compared to chemical pesticides is that the effect of pheromones is almost exclusively on the desired insect, and since pheromones are naturally occurring substances, they do not cause a resistance problem. Pheromones act in extremely small amounts and are biodegradable.

One area where the use of pheromones is particularly valuable • is the control of forest pests, as large amounts of forest are lost each year due to the damage caused by insect attacks. Damage can be both major damage when trees die and growth and reproduction losses that occur in the longer term.

9,12-tetradecadienyl acetate is a known insect pheromone, a pheromone of insects belonging to the family Pyralidae of the family Lepidoptera (Journal of Chemical Ecology, Vol. 5, No. 2, 1979, pp. 251-257).

2,74585 9-Tetradecenyl acetate is a known pheromone from Dioryctria disclusa (Environmental Entomology, 11 (1982) pp. 986-988).

According to the present invention, it has been found that (N, E) -9,11-tetradecadadienyl acetate has an attractive effect on dogs of Dioryctia species, i.e. it acts like a sex pheromone of this genus. The butterflies of the genus Dioryctria (Lepidopte-ra: Pyralidae) cause great damage to spruce and pine seeds around the world every year, as well as in northern Europe and North America.

The present invention is thus the use of (Ζί, Ε) -9,11-tetradecadienyl acetate for the detection and control of spruce cone, Dioryctria abietella.

(Z, E) -9,11-tetradecadienyl acetate (cis-9, trans-11-tetradecadienadiene acetate) O, N, N, CH3 is a compound known per se, and it is even known that in combination with other polyunsaturated compounds acts like a sex pheromone for certain Spodoptera-la species. The compound can be prepared, for example, in Hall, D.R., Beevor, P.S., Lesler, R., Popi, R.G. and Nesbitt, B.F., Chem. & Ind. 5 (1975) 216.

After using attractive pheromones to control insects in three ways: 1) to detect and evaluate the population, 2) directly to control by trapping, and 3) directly to control by causing confusion. According to the invention, (Z, E) -9,11-tetradecadienyl acetate can be used for controlling Dioryctria abietella by any of the methods described. According to the first method, traps are placed, 3 74585, in which the substance in question is used as bait. Dogs are then attracted to the substance by being attracted to the substance, and the capture results provide information on the presence and population density of insects, which is then used to apply traditional pesticides, which can be done at the right time and avoiding overdose. According to the second method, traps containing similar baits are set, but here the traps are used to directly destroy trapped insects. In the confusing method, the substance is applied to larger surfaces to prevent the normal behavior of insects, in this case to prevent the identification of females by dogs and thus to prevent or reduce mating. In the mixing method, the substance may be injected in the form of an emulsion or solution, or it may evaporate from a preparation containing the substance which has been applied to a number of sites in the target area.

As previously mentioned, pheromones act in extremely small amounts and are thus best used in the form of some mixture or some method that provides delayed and fully controlled excretion. Almost any liquid carrier can be used in the compositions, such as various plastics. Furthermore, the substance may be enclosed in a tablet or capsule or other dispersion form which provides a slow release.

The larvae of the spruce cone, Dioryctria abietella, live and develop in spruce cones, and since spruce seed crops have been used in Sweden and other countries for several years, the presence of D. abietella causes a significant deterioration in seed production and seed quality. Butterflies lay their eggs when the cones are at a very sensitive stage, when it is particularly disadvantageous to use chemical pesticides, given the name itself, given the long time it takes for the effect to show up in a growing forest.

4,74585

Field experiments have shown that (.Z, E) -9,11-tetradecadienyl acetate has a very good attractive effect on Dioryctia abietella dogs.

Example

Field trials were conducted between 25 June and 15 July 1982 in an older spruce forest with an abundance of one-year-old cones in which D. abietella larvae developed. Glue traps were placed on the trees 10-15 meters above the ground and at a distance of at least 50 meters. The gears contained varying amounts of (Z, E) -9,11-tetradecadienyl acetate. The substance was absorbed into rubber capsules, which then excreted approximately the same amount / cf for a long time.

The table below shows the results in terms of catch figures for different concentrations of active substance in the gear.

amount of active substance number of dogs per gear g per gear 10 6 30 26 100 41 300 12