|WALKER, ANDREW - University Of California|
Submitted to: Entomological Society of America Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 10/2/2009
Publication Date: 10/10/2009
Citation: Backus, E.A., Walker, A. 2009. Differences in Stylet Penetration Behaviors of Glassy-winged Sharpshooters on Xylella-Resistant Vitis candicans vs. Susceptible Vitis vinifera cv. ‘Chardonnay’[abstract]. Entomological Society of America Annual Meeting, Dec 13-16, 2009, Indianapolis, Indiana. Paper No. 44254.
Technical Abstract: Electrical penetration graph (EPG) monitoring was used to compare stylet penetration behaviors of glassy-winged sharpshooter (GWSS), a vector of Xylella fastidiosa (Xf), on Xf-resistant Vitis candicans grape vs. susceptible V. vinifera cv. ‘Chardonnay.’ Frequency of occurrence of X waves (representing the putative inoculation behavior) was significantly reduced on V. candicans compared with Chardonnay. In addition, both duration and frequency of ingestion from xylem were significantly lower on V. candicans. Results suggest that reduced inoculation efficiency by GWSS vectors may be one mechanism of Xf resistance in V. candicans. This study supports that EPG could be used as a tool for screening host plants for resistance to vector inoculation of Xf.