The San Joaquin Valley Grape Symposium, featuring information for raisin, table, and wine grape growers, will be Wednesday, Jan. 5, at the C.P.D.E.S. Hall in Easton, Calif.

University of California Cooperative Extension viticulture advisors and specialists are scheduled to speak from 8:30 a.m. to 12 p.m., followed by lunch. They will cover western grapeleaf skeletonizer, vertebrate pest management, grapevine rootstocks, irrigation and canopy management, and potential winegrape cultivars for the San Joaquin Valley.

Kern County farm advisor David Haviland will discuss his current research on western grapeleaf skeletonizer and some new management approaches for this old pest. Once a major pest and nuisance for field crews, western grapeleaf skeletonizer was reduced substantially by natural parasites imported by researchers.

“Recent increases in vineyard worm populations prompted this research,” said Stephen Vasquez, UC Cooperative Extension viticulture advisor for Fresno County. “The primary goal of this study was to evaluate the effectiveness of new insecticide chemistries and how they might fit into an IPM program to manage worms like western grapeleaf skeletonizer.”

Fred Rinder, wildlife management supervisor with the Fresno County Ag Commissioner's office, will cover current laws and regulations for managing vertebrate pests in vineyard systems. USDA geneticist Peter Cousins will discuss the development of nematode resistant rootstocks for San Joaquin Valley vineyards. Larry Williams, UC Davis viticulture professor, will describe the effects of irrigation and canopy management on merlot grown in Madera. UC Cooperative Extension specialist Jim Wolpert will discuss wine grape varieties grown in the Mediterranean regions and their possible uses in the San Joaquin Valley.

Registration for the symposium is $22 per person and includes lunch and symposium proceedings. Lunch will be catered by Dino Petrucci of Madera. To attend the meeting and receive the proceedings without the lunch, registration is $10. Send registrations by Dec. 29 to Stephen Vasquez, UC Cooperative Extension, 1720 S. Maple Ave., Fresno, CA 93702. Late and at-the-door registration is $15 and will not include lunch. Please make checks payable to “UC Regents.”