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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

INTERSPECIFIC COMPETITION BETWEEN GONATOCERUS ASHMEADI ANDG. TRIGUTTATUS FOR GLASSY-WINGED SHARPSHOOTER EGG MASSES

  • Author(s): Hoddle, Mark; Irvin, Nic;
  • Abstract: We are currently studying the competitive behavior of two GWSS egg parasitoids, Gonatocerus ashmeadi Girault and G. triguttatus Girault (both Hymenoptera: Mymaridae), to determine which one shows the most potential as a classical biological control agent for GWSS. A better understanding of the interactions between these two parasitoids may provide an insight into predicting and interpreting field outcomes following the establishment and proliferation of G. triguttatus in California as it competes with the precinctive G. ashmeadi. Therefore, the following investigations were conducted to investigate which parasitoid species is most competitive using two different experimental designs representing high and low GWSS egg mass densities.
  • Publication Date: Dec 2002
  • Journal: 2002 Pierce's Disease Research Symposium

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