Monday, December 11, 2006

The role of olfactory cues in host-plant selection by the glassy-winged sharpshooter, Homalodisca coagulata

Hannah Nadel, hnadel@fresno.ars.usda.gov1, Russell Groves, rgroves@fresno.ars.usda.gov1, Ron Seligmann, ron.seligmann@agrotalk.com2, Marshall W. Johnson, mjohnson@uckac.edu3, and James Hagler, JHagler@wcrl.ars.usda.gov1. (1) USDA-ARS, 9611 South Riverbend Ave, Parlier, CA, (2) AgroTalk, 6 Agnon St, Raanana, Israel, (3) University of California - Riverside, Entomology, UC Kearney Agricultural Center, 9240 S. Riverbend Ave, Parlier, CA

The glassy-winged sharpshooter (GWSS) is a highly polyphagous and mobile vector of Pierce’s disease of grapes. Trap captures in a multi-crop agricultural landscape under constant deficit irrigation suggest that adult GWSS movement is tied to irrigation schedules. To understand the observed patterns of movement, we explored the orientation and feeding responses of adult GWSS toward citrus and avocado plants undergoing various levels of water-deficit and nutritional treatments. Preliminary results with cage and olfactometer studies indicate that GWSS distinguishes water-stress in hosts and orients toward well-hydrated plants.

Species 1: Hemiptera Cicadellidae Homalodisca coagulata (glassy-winged sharpshooter)