Abstract
The field persistence and efficacy of Bacillus thuringiensis formulations The persistence of spores ofBacillus thuringiensis (commercial formulation Dipel and Bathurin) on oak leaves under different climatic condition in field trials was determined. The killing activity of these preparations against wintermothOperophthera brumata and green oak tortrix Tortrix viridana was parallely tested. Within the first week after the application of bacterial preparations the viable spore count on leaves was reduced of two up to three orders. The efficacy of bacterial preparations depends, however, on the environmental temperature occurring within the first week after the application. The adequate temperature is the primary deciding for the feeding activity of caterpillars and for the virulence of the preparations. For aerial application doses of 0.5 to 1.0 kg of the preparation in 50 100 l of water per one ha were sufficient. In the contrary, Dipel WP in oil suspension was unsufficient for aerial application because of mechanical blocking of the nozzles. The optimal time for the procedure was the first week of May in our climatic conditions.
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