The Root-Knot Nematodes
Damage to Corn. Because of the world-wide
distribution of the root-knot nematodes and the damage they are known to
cause, these nematodes must be ranked as important disease producers
Biology. There are at least 6 Meloidogyne
species which affect corn roots. The female is usually pear-shaped,
with a fragile white cuticle, and may be up to 2 mm in diameter.
Ecology. Root-Knot nematodes are distributed
Symptoms. Symptoms of corn infection by
spp. vary with the species, but generally include stunting and chlorosis.
Numerous root galls are noted in infected plants, proliferation of
fibrous roots may also be present.
Damage to other crops. Tomato plants are
also damaged by root-knot nematodes.
Control. Good control of some species
has been obtained with chemicals- with fumigants generally giving better
control than granular nematicides.