Preplant soil fumigation has long been an effective way to control nematodes, but fumigation in the future may be limited, says Dr. Inga Zasada, U.S. Department of Agriculture scientist. She offers the following suggestions to help ­vineyardists manage nematodes in the event fumigants are unavailable. 1. Planting material—Use certified plant material to avoid bringing nematodes into your field. Choose a grape variety based on the kinds of nematodes you have. “If you sample and have northern root knot and can’t fumigate, you may want to stay away from white varieties,” she said. Consider using nematode-­resistant rootstock, matching rootstock resistance to […]