The glassy-winged sharpshooter (GWSS) Homalodisca coagulata is a known vector of various strains of the bacterium Xylella fastidiosa, including the strain the causes Pierce's disease of grape. While some sharpshooters native to California feed on grape, GWSS feeds and reproduces on grape.
The number of females trapped in Jul, Aug, and Sep 2002 showed a strong relationship to the number of nymphs found in searches in untreated vineyards. Analysis of the data from the vineyards provided the expression y=3.4X - 2.4 where y=number of nymphs per search and X is the number of females captured per trap (R2=0.97, F=378.7, P=0.003).
Species 1: Homoptera Cicadellidae Homalodisca coagulata (glassy-winged sharpshooter)
Species 2: Xanthomonadales Xanthomonadaceae Xylella fastidiosa (xylem limited bacterium)
Keywords: Pierce's disease
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