Use certified nematode-free rootstocks or seedlings to establish new orchards. When the orchard is developed, use procedures that improve soil tilth and drainage to help reduce nematode damage. Use certified nematode-free rootstocks. Among peach rootstocks, Nemaguard is known to be resistant to root knot nematodes, but it is susceptible to ring and lesion nematode. Lovell is a slightly poorer host t ring nematode and somewhat more tolerant of bacterial canker complex but susceptible to root knot and root lesion nematodes.
Some apricot rootstocks are nonhosts for root knot nematode.
Plum rootstocks Myrobalan 29C and Marianna 2624 are resistant to root knot nematode, but highly susceptible to ring and somewhat susceptible to root lesion nematode. Contact your local farm advisor for additional information on rootstock selection. Threshold levels for a postplant treatment have not been established. Yield and vigor increases may not become evident for 6 to 18 months following treatment with fenamiphos. To help determine the effectiveness of postplant treatments, leave several trees or rows of trees untreated for comparison.