The Needle Nematode
Damage to Corn. Needle
Nematode can be one of the most devastating diseases of corn- causing
yield reductions of up to 62% in severely affected areas.
breviannulatus is a large nematode, females measure about4
-5 mm long, (males are rare).
Ecology. Largest populations of Longidorus
occur in soil with a sand content of 90% or more. Most nematodes
are found early in the growing season. Damage may be noticed within two
weeks after seedling emergence.
Symptoms. Stunted plants appear to be
under drought stress, and appear in oval or oblong patches in an affected
field. Scarcity of small feeder roots may give the root system a
Damage to other crops.
Control. Crop rotation will help if graminaceous
weeds are kept in check.