Pierce's Disease
Research Updates


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

Screening for sycamores that may be tolerant to leaf scorch disease caused by Xylella fastidiosa

  • Author(s): Britton, K.; Chang, Chung-Jan; Leininger, T.;
  • Abstract: A total of 3264 two-year-old seedlings representing nine families was injected with a cell suspension of X. fastidiosa (1840) or with PW broth (1424) in May 2000. Two hundred samples were collected in October 2000 for the detection of X. fastidiosa using the ELISA Kit manufactured by Agdia, Inc. In 2001, the same tests were performed for two hundred and six samples collected monthly from the same marked trees from June to October. Results from Oct 2000 tests showed infection rates in percent of 27, 32, 16, 18, 22, 16, 22, 29, and 30 for family 295522, 27012, Filler, 296511, 295582, 295201, 295032, WV398, and 11006 respectively, as compared to 35, 60, 57, 29, 37, 26, 37, 50, and 50 for 2001 results. Data suggest various degrees of tolerance among sycamore families. Families 296511 and 295201 were most tolerant whereas 27012 and Filler most susceptible to the infection of X. fastidiosa. The monthly infection rates were 10, 15, 23, 42, and 43% for June, July, August, September, and October, respectively.
  • Publication Date: Jun 2002
  • Journal: Phytopathology