The lesion Nematode
Damage to Corn. Damage from Pratylenchus
can range from severe to very slight, depending on the degree of infestation,
and environmental conditions.
Biology. There are at least 5 Pratylenchus
species that cause root lesions in corn. Pratylenchus
are small nematodes (0.30 - 0.75 mm) that invade the corn roots to feed
and lay their eggs.
Ecology. Although Pratylenchus
does best in sandy soils, this nematode is widespread and can reach high
population levels in the finer soils of the mid-western U.S. corn belt.
Symptoms. Lesion nematodes can cause severe
pruning of the roots, resulting in stunting, as well as reduction in stalk
diameter, stalk and root weights. Cholorosis or other discoloration is
often evident, also.
Damage to other crops.
Control. Rotation with cotton and peanuts
has been found to reduce populations of lesion nematodes in Georgia. Chemical
nematicides have also been successful in reducing their numbers.