EPIDEMIOLOGY AND MANAGEMENT OF XYLELLA FASTIDIOSA (XF) AND OTHER EXOTIC AND INVASIVE DISEASES AND INSECT PESTS
Location: Crop Diseases, Pests and Genetics
Title: Glassy-winged sharpshooters (GWSS) are not GWSS: Differential Reproductive Maturity between Allopatric Californian Populations
Submitted to: CDFA Pierce's Disease Control Program Research Symposium
Publication Type: Abstract Only
Publication Acceptance Date: December 5, 2009
Publication Date: December 9, 2009
Citation: Krugner, R. 2009. Glassy-winged sharpshooters (GWSS) are not GWSS: Differential Reproductive Maturity between Allopatric Californian Populations. [abstract]. California Department of Food and Agriculture, Pierce's Disease Control Program Research Symposium, December 9-11, 2009, Sacramento, CA.
Homalodisca vitripennis (Germar) is native to southeastern U.S. 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 Wells et al. to grapevines and other crops. The reproductive behavior of H. vitripennis from two allopatric populations in California (Riverside (RIV) and Bakersfield (BAK)) was evaluated under identical conditions. The RIV and BAK populations had different preoviposition periods that persisted through the second generation of each lineage. From adult molt, the preoviposition period in both female generations and was significantly shorter for RIV (F0 = 28.2 d and F1 = 62.3 d) than BAK females (F0 = 46.1 d and F1 = 170.4 d). On average, F0 and F1 females deposited 390.6 (range, 21-967) and 196.3 (range, 0-755) eggs, respectively, without significant differences in fecundity among the F0 and F1 treatments. The F0 mating pairs: 'RIV × 'RIV, 'RIV × 'BAK, 'BAK × 'RIV, and 'BAK × 'BAK produced on average 185, 94, 79, and 0 fertilized eggs, respectively, which indicated a delayed reproductive maturity of BAK males and females. The proportion of fertilized eggs deposited decreased gradually until females completely exhausted sperm reserves.