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Pierce's Disease
Research Updates

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What is Pierce's Disease?

Pierce's Disease is a bacterial infection, which is spread by bugs that feed on grapevines, particularly the "glassy winged sharpshooter." Grapevines that become infected with PD can quickly become sick and die.

glassy-winged sharpshooter

REALIZED LIFETIME PARASITISM OF GLASSY-WINGED SHARPSHOOTER EGG MASSES BY GONATOCERUS ASHMEADI

  • Author(s): Hoddle, Mark; Irvin, Nic; Luck, Robert;
  • Abstract: The relationship between female Gonatocerus ashmeadi size (hind tibia length) and <24 hr egg load was determined for spring and summer G. ashmeadi generations in Riverside, CA. Female size was positively correlated with egg load for both spring and summer generations with egg load varying from 23-108 eggs per female in spring and 29-118 eggs per female in summer. The use of near infrared spectroscopy (NIRS) and a wing deterioration index to estimate parasitoid age was also investigated and preliminary results demonstrated that both techniques may show potential for estimating the age of field collected G. ashmeadi.
  • Publication Date: Dec 2005
  • Journal: 2005 Pierce's Disease Research Symposium

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