Die Behandlung von berindetem Nutzholz mit Insektiziden. Versuche mit verschiedenen Wirkstoffen in Schweden 1969–73

Abstract

Insecticide treatment of unbarked conifer logs. Experiments with various substances in Sweden 1969–73

In 1969–73 the protection of unbarked pine and spruce logs by means of insecticides was studied at several localities in Sweden. Investigations have been carried out into the effect of eleven substances and various combinations, as well as formulations and concentrations, upon the attacks of bark beetles and other insects. More than 2 100 logs were used in the experiments.

Lindane was by far the most effective. It had also a very good effect upon the beetles which entered or had entered the wood.

All the carbamates studied, i. e. BPM-carbamate, carbaryl, mobam, promecarb, and propoxur, as well as the organophosphorous compounds Bayer 77488, fenitrothion, and fenthion, had an unsatisfactory effect. Endosulfane was not ineffective, but the tests were discontinued. Dursbane was studied on spruce only and had a good effect.

One year after the treatment, lindane did no longer give reliable protection. After treatment in the autumn it protected against bark beetles on spruce in the spring, but had less effect on pine. There was no considerable difference in the effect of wettable powder and emulsion concentrate. In some cases wettable powder had a slightly better effect. The lowest suitable concentration was about 0,25%.