Susceptibility of life stages of Paropsis charybdis to Beauveria bassiana.
P. charybdis is a pest of eucalypts and is responsible for increasing problems in some New Zealand plantations. In bioassays at 25°C, isolates (F235, F238 and F305) of the entomopathogenic fungus, B. bassiana, were tested against larvae, pupae and adults of P. charybdis. Using a topical spray application of 105 and 107 conidia/ml, larvae and pupae were highly susceptible to two isolates of the fungus and a commercially available B. bassiana product. In a second experiment, an isolate from the commercial product and a larval-active isolate were less pathogenic to adults than larvae or pupae. First to second instar larvae died more rapidly than older instars and pupae after infection.