It does not enter into the root like root-knot and lesion nematodes but penetrates the outer layer of cells with a grooved spear. With high populations, above-ground symptoms include stunting and poor vigor. Root systems are reduced and become course, or stubby with extensive short branches and necrosis. Crop rotation can be a useful management tool but the wide host range of these nematodes make it impractical in many cases. Preplant fumigation is an option and is very effective for reducing nematode populations, but may not be economical.
Peppers vary in their susceptibility to root-knot nematode.
Nematode-suppressive green manures, including Sudangrass and rapeseeds may reduce populations of these nematodes, and their damage. Marigolds, Tagetes patula T . A new marigold cultivar, Polynema, has recently been developed specifically for reducing nematodes in infested soil. Information on our site was developed for conditions in the Northeast. Use in other geographical areas may be inappropriate.