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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

Surface motility of Xylella fastdiosa visualized by oblique illumination.

  • Author(s): Chen, Jianchi; Civerolo, Ed; Groves, Russell; Livingston, Sam;
  • Abstract: Stereomicroscopic observations using oblique illuminations revealed the presence of two types of movement trails by Xylella fastidiosa strains (A- and G-genotypes) isolated from almond leaf scorch samples on the surface of PW and PD3 culture media. The A-genotype strains showed curved motility trails and the G-genotype strains showed straight motility trails. Haloes were found around some G-genotype colonies due to the excretion of unknown factors/compounds which may be related to the bacterial surface motility.
  • Publication Date: Nov 2006
  • Journal: Canadian Journal Of Microbiology

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