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Early season sprays of the insect pathogen Bacillus thuringiensis, or “Bt,” were applied to peaches and almonds to determine efficacy against peach twig borer (PTB). Data indicates one or two Bt treatments during bloom are as effective as a dormant organo-phosphate plus oil spray for PTB control. Research is currently under way to determine the impact on other pests.
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Barnett et al. (1993) studied this question.
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