IPMP3.0, Oregon State University, Copyright 2000





Registered Nematicides


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Root-Knot Nematode, 2nd Juvenile Stage

Root-Knot Nematode Female in Root Female Removed From Root

Northern Root-knot Nematode Body Northern Root-knot Nematode Female Stained in Root (top) and removed from root (bottom)
Northern root-knot nematode (Meloidogyne hapla) infests both peppermint and spearmint, but spearmint appears to be more tolerant. Northern root-knot nematodes are typical sedentary endoparasites, which invade root tissue soon after hatching and then establish a permanent, stationary feeding location. Eggs overwinter in the soil and in live or decaying root tissues. Northern root-knot nematodes may cause only slight damage the first growing season, but severe damage may occur in subsequent seasons as populations increase. Presence of root-knot nematodes in peppermint is important to growers planning to rotate from mint into potato, since these nematodes will make tubers unmarketable if they are not managed properly.
General Description General Description of Damage Symptoms