Abstract
Bioassay tests were conducted from 10 Mar through 8 Apr (study 1) and 31 Aug through 22 Sep (study 2) at the University of Hawaii at Manoa, Waiakea Experiment Station in Hilo, HI. Established plants ‘Uniwai Supreme’ (study 1), and ‘Uniwai Pearl’ (study 2) growing in 0.5 inch crushed basalt rock under a Conley cold frame greenhouse (6 mil. clear FVG 3HLFI polyethylene film covering) were used in this study. Insecticides were applied once at 1,375 liters/ha using a compressed air sprayer with a 8004 Teejet nozzle at 40 psi. Sixteen leaves per treatment, 4 leaves per replicate, were removed weekly from the plant and placed into 12.0 × 10.5 cm unwaxed paper containers. Ten orchid weevils, field collected on bamboo orchids, Arundina graminifolia (D. Don) Hochr., were added to each container and covered with organdy. In study 1, leaf residues were assayed 7, 14, and 21 d after treatment. Weevil mortality and the number of feeding marks (injury) were assessed using a 5d exposure period. In study 2, residues were bioassayed 7 and 14 d after treatment and mortality and injury were assessed after a 2 d exposure period.
Head Cabbage, Microbial Control of Cutworm, Webworm, Cluster Caterpillar and Gardenlooper, 1993