DEVELOPMENT OF A FIELD SAMPLING PLAN FOR GLASSY-WINGED SHARPSHOOTER-VECTORED PIERCES DISEASE

• Author(s): Gispert, Carmen; Hashim, Jennifer; Perring, Thomas; Farrar, Charles; Hill, Barry; Kelly, Maggi; Krell, Rayda; Park, Yong-Lak; Pryor, Murry;
• Abstract: Determining the location of grapevines infected with Pierces disease (PD) in vineyards has been a major question for growers and researchers. Field census has been the only reliable way to identify vines infected with PD in the vineyard. Censuses, however, are difficult when PD incidence is high. In these situations, we need a sampling program that accounts for the spatial structure and pattern of PD in the vineyard. To characterize the spatial distribution patterns of PD, census data from Kern County vineyards were analyzed with geostatistics. These analyses showed that dispersion of PD varied with the amount of PD infection, and with vineyard proximity to citrus. Based on these analyses, our goal is to develop a sequential sampling program for detecting PD in vineyards.
• Publication Date: Dec 2004
• Journal: 2004 Pierce's Disease Research Symposium