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 is a major objective of growers and researchers. Currently, there are no sampling protocols available except for field surveys based on PD symptoms. The work reported here was conducted in Kern County and the Coachella Valley towards developing a sampling plan to detect the locations of diseased grapevines within vineyards. Spatial distribution patterns of PD were characterized with spatial statistics. Results from Kern County sampling suggest that knowing the percentage of PD infection and the location of vineyards relative to citrus can predict the distribution pattern of PD in the vineyard. Research in the Coachella Valley suggests that PD distribution is highly localized within vineyards, and diseased grapevines are associated with two or more dead, replanted, or missing adjacent grapevines. These results bring us closer to developing reliable sampling protocols for PD in vineyards.
• Publication Date: Dec 2005
• Journal: 2005 Pierce's Disease Research Symposium