As things ramp up in preparation for harvest, it is also a good time of the year to keep an eye out for Pierce's disease. Symptoms are strongest this time of year, therefore consider scouting the vineyard as time allows and flag suspected diseased vines for later removal.

The following document has some additional details about what you're looking for: 

For additional information contact Matt (matt.daugherty@ucr.edu; 951-827-2246)