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The aim of the work was to estimate the insecticidal activity of Bacillus thuringiensis MPU B9 spore-free preparation of crystals against Leucoma salicis caterpillars (willow and poplar pest). The results revealed a high biological activity of B. thuringiensis MPU B9 crystals towards L. salicis larvae. This may be caused by production of numerous, different crystalline proteins by the MPU B9 isolate...
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