Submitted to: CDFA Pierce's Disease Control Program Research Symposium
Publication Type: Abstract Only
Publication Acceptance Date: 10/9/2010
Publication Date: 12/15/2010
Citation: Krugner, R., Sisterson, M.S., Lin, H. 2010. EXPERIMENTAL ANALYSIS OF BIOLOGICAL PARAMETERS AND VECTOR ABILITY OF GLASSY-WINGED SHARPSHOOTERS FROM ALLOPATRIC POPULATIONS IN CALIFORNIA. [abstract]CDFA Pierce's Disease Control Program Research Symposium, Dec 15-17, 2010, San Diego, CA. p. 21.
Technical Abstract: The glassy-winged sharpshooter (GWSS), Homalodisca vitripennis (Germar), is native to the southeastern United States and northeastern Mexico. It was detected in southern California in the late 1980s and in the San Joaquin Valley in 1999, where it transmits the bacterium Xylella fastidiosa to grapevines and other crops. The transmission efficiency of X. fastidiosa to grapevines and the reproductive success of hybrid and pure line GWSS from two allopatric populations in California (Riverside (RIV) and Bakersfield (BAK)) were evaluated under identical controlled conditions. To test the effects of GWSS origin (RIV versus BAK), gender, and age on transmission, insects were given a 96h acquisition access period on infected grapevines and a 72h inoculation access period on healthy grapevines. At conclusion of the test, ~33% of test plants were infected, with no effect of GWSS origin, gender, or age on transmission, confirming that these factors do not affect transmission. Comparison of reproductive success based on origin found that the preoviposition period in both female generations was significantly shorter for RIV (F0 = 28.2 days and F1 = 62.3 days) than BAK females (F0 = 46.1 days and F1 = 170.4 days). There were no significant differences in fecundity and longevity among the F0 and F1 mating pair treatments. There was a gradual decrease in the number of viable eggs deposited by GWSS females, suggesting that females exhausted sperm reserves and that re-mating may be necessary to produce viable progeny. From a management perspective, delayed reproductive maturity and polyandry are weak links in GWSS’s biology that may be exploited through mating disruption or insect sterilization strategies to reduce population growth and augment pressure by natural enemies.