(G51) LIQUIDAMBAR: Liquidambar styraciflua L. CONTROL OF ADULT GLASSY-WINGED SHARPSHOOTERS ON LIQUIDAMBAR UNDER GREENHOUSE CONDITIONS, SUMMER 2001 James A. Bethke and Richard A. Redak Department of Entomology University of California Riverside, CA 92521 Phone: (909) 787-4733 E-mail: firstname.lastname@example.org Glassy-winged sharpshooter (GWSS): Homalodisca coagulata (Say) The efficacy of selected pesticides was evaluated for the control of adult glassy-winged sharpshooters in a greenhouse study using an RCB design with five replicates. Potted liquidambar, 40-60 cm tall in 15-cm pots, were fertilized once with approximately 7 g of Osmocote (14-14-14) and irrigated every other day. Treatments were applied using a backpack sprayer at 30-40 psi. When the plants dried, they were covered by cages. Cages consisted of an acetate cylinder covered with screening material (32 x 32, Product no. 5006104, Chicopee Lumite, Gainesville, GA) glued to the top of the cylinder for ventilation. The finished cage was 40 cm diam by 70 cm high. GWSS adults were collected from citrus at the University of California Agricultural Operations, Riverside. Twenty adults were released in each cage covering the treated liquidambar. No attempt was made to control the age of the sharpshooter used in the trials. Mortality was recorded 1 DAT. Although plants were only treated once, new insects were placed in the cages weekly for 4 wk. All data were corrected for control mortality by Abbott's formula and transformed arcsine Öx prior to analysis. Data were analyzed by ANOVA, and means were separated by LSD ( a = 0.05). No phytotoxicity was observed in any treatment during the length of the trial. One hundred percent control was obtained 1 wk after treatment in all but two treatments, Akari and Mavrik. Akari caused > 70% control in the first week, and efficacy was poor thereafter. Although Mavrik provided greater than 90% control in the first week, and efficacy declined rapidly in the rest of the trial. One hundred percent control was maintained for 3 wk after treatment by treatments of DeltaGard, Scimitar, and Tame. Four weeks after treatment, best control was obtained by Scimitar at 95.5% followed by DeltaGard + Tween at 85%. All other treatments provided less than 80% control.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2002