Insecticidal control of fruitspotting bug, Amblypelta nitida Stal (Hemiptera: Coreidae) and macadamia nutborer, Cryptophlebia ombrodelta (Lower) (Lepidoptera: Tortricidae)

Abstract

During 1982-83 sprays of 0.005% permethrin, applied at 2, 3 and 4 week intervals, 0.00125% deltamethrin applied at 3 week intervals and 0.05% endosulfan and/or 0.1 % carbaryl applied at 2 week intervals were compared against Amblypelta nitida Stal and Cryptophlebia ombrodelta (Lower) on macadamia at Nambour. All treatments reduced damage by both insects (P<0.01 ). Deltamethrin was superior (P<0.05) to permethrin (2, 3 and 4 weeks) against A. nitida and was also superior (P<0.01) to endosulfan and/or carbaryl and permethrin (4 weeks) against C. ombrodelta. Deltamethrin resulted in less A. nitida damage (P<0.05) than permethrin (3 and 4 weeks) in mature nuts at harvest. Percentage recovery of no. 1 kernels for deltamethrin (38.41) was higher than endosulfan and/or carbaryl, permethrin (2 weeks) (P<0.05) and the untreated control (P<0.01).