Laboratory and semi-field trials on the effects of Beauveria bassiana (JW-1, ATCC 74040) against soil-dwelling stages of Frankliniella occidentalis (Thysanoptera: Thripidae)

Beauveria bassiana (Balsamo) Vuill. is an entomopathogenic fungus used in controlling various pests. Previous research showed that B. bassiana, applied to the plant canopy, could exert a significant control of thrips populations, in particular of Frankliniella occidentalis Pergande. However, some stages (e.g., prepupae and pupae) of this species develop in the soil being less affected by control treatments applied to the canopy. The identification of biological control agents active against soil-dwelling stages of F. occidentalis is an important issue for the implementation of IPM. Here we present laboratory and greenhouse experiments carried out to evaluate the potential of B. bassiana (JW-1 ATCC 74040) in controlling soil-dwelling stages of F. occidentalis. In laboratory bioassays B. bassiana reduced significantly the emergence of F. occidentalis adults. In the greenhouse experiment, a significant control of thrips population was obtained on cyclamen potted plants.