Issue link: https://read.dmtmag.com/i/298602
40 MAY 1, 2014 GOOD FRUIT GROWER www.goodfruit.com Ring nematode is a migratory ectopar- asite and spends its life in the soil. Hosts are mostly woody plants. Ring nematodes were located in similar depths as root knot, and were found in defined areas of water and roots. Root lesion nematodes are not a major species in the state. Zasada and research- ers found little evidence of root lesion nematodes parasitizing vine roots. Research The research team has evaluated the susceptibility of commonly grown own- rooted varieties. In microplot trials in the field they found that Chardonnay sup- ported greater root knot nematode popu- lations than Cabernet Sauvignon. In the greenhouse, the root knot nematode populations at the end of the experiment were three times higher on Chardonnay and Riesling than on several red varieties. While there are still gaps in the knowledge base in Washington, Zasada said that white varieties appear to be particularly sensitive. "If you are going into a site with northern root knot nematode, I recommend that white varieties be avoided," she said. A long-term project is under way to learn how nematodes impact vine establishment and produc- tivity of a vineyard. Three white and three red varieties have been planted into areas of a field either fumigated or not. Population dynamics of plant-parasitic nematodes, including root knot, as well as their impact on vine productivity, will be monitored during the coming years. • 888.638.1955 • www.cultivaipm.com • sales@cultivaipm.com Parka is a trademark of Cultiva. SureSeal is a trademark of Oregon State University. Always read and follow label directions. ©2014 Cultiva. Don't let another wet spring put the damper on your profits... Reserve your Parka today. Two applications, first at straw color and a second 7 - 10 days later are all that's needed to reduce rain induced splitting on your cherries. Pick Parka today and sleep better when the black clouds roll in. For more information call Cultiva at 888.638.1955. Parka Saves Time, Money and Cherries Who'll Stop the Rain? ILLUSTRATION BY KATHY MERRIFIELD Sizes of plant parasitic nematodes relative to the tip of a pencil.