The oriental fruit moth, Grapholita molesta (Busck) (Lepidoptera: Tortricidae) is a major pest of apple, peach, and plum in Korea. As a series of experiment we assessed effect of combined application of an entomopathogenic fungi (Beauveria bassiana ARP-14) and a botanical insecticide (azadirachtin) against male and female of adult G. molesta (<5 days old) in glass scintillation vials. LT50 value of combined application of ARP-14 and azadirachtin (51.9 h) was larger than that of positive control λ-cyhalothrin (34.4 h) in adult female G. molesta. But, adult male G. molesta didn't show any statistical difference between the combined application (34.2 h) and λ-cyhalothrin (44.1). Thus, combined application of ARP-14 and azadirachtin can be an optional management tactic against G. molesta.

Grapholita molesta (Busck) (Lepidoptera: Tortricidae) is an important pest of pome and stone fruits, i.e., apple, peach, and plum. We evaluated single or combined application of an entomopathogenic fungi Beauveria bassiana (Balsamo) Vuillemin. ARP14 (1×108 conidia/mL) and a botanical insecticide of azadirachtin (Azatrol, PBI/Gordon Cooperation) (10 mL/L) against first instar larvae (<5 h old) of G. molesta in glass scintillation vial bioassay. Combined use of B. bassiana ARP-14 and azadirachtin showed higher corrected morality of 100% at 8 h than 71.4% in λ-cyhalothrin used as a positive control.

Grapholita molesta (Busck) (Lepidoptera: Tortricidae) is an important pest of apple, peach, plum, etc. Growers use synthetic chemical insecticides to manage this pest, but G. molesta have developed an insecticide resistance. As botanical insecticides have been rarely studied against G. molesta, we assessed relative toxicity of azadirachtin (azatrol 10 mL/L) in comparison with λ-cyhalothtrin (6.7 mL/20L) in residual assays using both glass scintillation vial coated with the insecticides and apple fruits dipped in the insecticide solutions against first instar larvae (<5 h old) of G. molesta. Azadirachtin showed highest corrected morality of 96.7% at 8h followed by 63.3% in λ-cyhalothtrin in the scintillation vial. On apple dipped in the insecticide solutions, no significance in corrected mortality was found between azadirachtin and λ-cyhalothtrin. Thus azadirachtin can be used as a botanical insecticide for the management of G. molesta.