Factors Affecting Bacillus thuringiensis Total Field Persistence

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Abstract
Persistence and survival of Bacillus thuringiensis were studied in order to evaluate statistically abiotic influences under field conditions. Viable and total endospores, and bioassay with the cabbage looper Trichoplusia ni, were monitored. Abiotic factors were measured on leaves of beans, broccoli and cabbage. The data suggested no apparent differences in the survival or persistence of endospores among the crops. Solar radiation, leaf temperature and vapor pressure deficit affected B. thuringiensis endospore viability and pathogenicity. Bioassay was the best indicator of total field persistence of B. thuringiensis.