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United States Department of Agriculture

Agricultural Research Service

Title: Seasonal Fluctuations of Almond Leaf Scorch Strains of Xylella Fastidiosa: Implications for Secondary Spread

item Groves, Russell
item Cabrera, Juan - UNIV OF CA-RIVERSIDE

Submitted to: Entomological Society of America Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: June 20, 2004
Publication Date: November 17, 2004
Citation: Groves, R.L., Cabrera, J. 2004. Seasonal fluctuations of almond leaf scorch strains of xylella fastidiosa: implications for secondary spread. Entomological Society of America Annual Meeting. Available: htpp://

Technical Abstract: In recent years, almond leaf scorch disease (ALSD) has reemerged as a serious disease threat to almond production areas throughout California's San Joaquin Valley. This disease is caused by the xylem-limited bacterium Xylella fastidiosa (Xf). The bacterial pathogen is transmitted by xylem feeding sharpshooters (Cicadellidae) and spittlebugs (Cercopidae). Data collected from surveys in 2003 provided us with the opportunity to sample a select number of known ALSD-affected trees on a monthly basis in an effort to monitor the seasonal fate of Xf populations. Using quantifiable, real-time PCR on ALSD-affected plant material and associated insect vectors, we can characterize bacterial populations over the course of a growing season relative to the onset and expression of ALSD symptoms as well as acquisition and transmission of XF.

Last Modified: 4/22/2015
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