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Abstract
The efficacy of the biopreparations Dipel and Thuricide HP in combination with the pyrethroid Permethrin, and that of Permethrin in the control ofOrgyia antiqua larvae has been tested in the field. The results indicate that these preparations may replace satisfactorily insecticides of the group of chlorated carbohydrates, and organophosphates, in the control ofOrgyia larvae. The persistence of spores of both Dipel and Thuricide was found to be good on the pine needles. The main advantage of the tested preparations is their complete harmlessness to vertebrates. Since they do not contaminate the external environment, they can be used safely in the treatment of large areas of infected forest stands located at the site of important water resources and recreation areas.
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