Farmers interested in learning more about the curcurbit yellow stunting disorder virus (CYSDV) can participate in a CYSDV workshop on July 25 at 7:30 a.m. in Yuma, Ariz.

Topics to be discussed include:

- An overview of CYSDV discovery and identification;

- The impact and understanding of the 2006 California CYSDV outbreak;

- The status of SYSDV and breeding in Sonora, Mexico;

- An overview of CYSDV biology and a review of the 2006 Arizona outbreak;

- An update on the spring ’07 CYSDV incident in Yuma County, Ariz.; and

- The outlook for the fall ’07 melon crop.

CYSDV can infect all melons, cucumbers, summer and winter squash, pumpkins, and gourds. First CYSDV symptoms occur on older leaves and resemble water stress. A yellowing between the veins streaks the leaves that later turn bright yellow. Small green spots develop on the leaves of certain varieties.

As the plant’s internal transport system breaks down, the older leaves are shed. Without enough leaves, plant vigor is reduced and the plant doesn’t support and nourish the fruit.

The free CYSDV workshop will be held at the University of Arizona Cooperative Extension Auditorium, 2200 W. 28th Street, Yuma. Registration starts at 7:30 a.m. Pre-registration is not required.

For more information, contact Nick Nolte at (928) 726-4904 or knolte@cals.arizona.edu.