Reaction of Grape Rootstocks to Ring Nematode Mesocriconema xenoplax

摘要: The reaction of grape rootstocks to the ring nematode Mesocriconema xenoplax was studied in glasshouse experiments and a vineyard trial. Growth one Oregon population M. differed among 20 rootstock self-rooted cultivars grown for eight months. reproductive factor, Rf (final density divided by initial density), ≤0.5 420A Mgt ≤2.4 101-14 110R rootstocks; values ≤1 indicate high resistance. Other had between 6.9 52.5. Root dry weights all varieties except were reduced . In another experiment, found be resistant Washington State four populations , although both moderately susceptible California population. A root-stock trial planted 1997 infested with After six seven years, densities lowest vines on (≤0.08 g −1 soil) (≤0.24 rootstocks. Population other ranged from 1.25 4.57 soil. produced good vine vigor yield showed highest degree Rootstock Mgt, which is widely used Oregon, also but only average yield. common rootstocks, Riparia Gloire, 3309C, Pinot noir, highly least vigorous vines.