Pathogenicity of Entomogenous Fungus, Cerambycid-Parasitic Type of Beauveria brongniartii (Sacc.) Petch, Isolated from Yellow-Spotted Longicorne Beetle, Psacothea hilaris, to Adult Honeybee, Apis mellifera (L.), Carabid Beetles, Apotomopterus japonicus Motschulsky and Apotomopterus dehaani Chaudior

Abstract

The mortality of adult honeybees, Apis mellifera (L.), sprayed with a conidial suspension of Beauveria brongniartii GSES was 9% to 40% at concentrations of between 1×10⁸ and 1×10⁴conidia/ml, whereas the mortality of adult honeybees sprayed with distilled water as a control was 12%. No bee cadavers had outer mycelial growth. The mortality of two carabid beetles, Apotomopterus japonicus and Apotomopterus dehaani, sprayed with conidial suspensions of B. brongniartii GSES and SES879 was 11%-35% at concentration of 1.4×10⁷ and 1.5×10⁷conidia/ml, whereas the mortality of Psacothea hilaris was 80% to 100% at the same concentrations. All cadavers of P. hilaris had outer mycelial growth, but the cadavers of the two carabids had none. It is concluded that this fungus is not pathogenic to adult honeybees and the two carabid beetles.