http://uvalde.tamu.edu/STAFF/Black/PDNCR06Text.htm#NEMATODE_DISEASES

Nematode management in groundnut

Several kinds of plant parasitic nematodes may cause damage but root knot, caused by the peanut root knot nematode Meloidogyne arenaria, is normally the most severe. Root knot is diagnosed based on galls on roots and usually also on pegs and pods.

A control program for nematodes should include:

• Rotation with crops resistant to the nematodes damaging peanuts
• Late maturing varieties have more potential for damage than short-season spanish market types Cultivation of varieties
• resistant to peanut root knot
• Consider a nematicide when plant parasitic nematodes have previously limited production.

Use caution when selecting a nematicide since soil moisture is extremely critical for optimum control. Excessive soil moisture and cold temperatures limit movement of the fumigant in the soil, thus reducing effectiveness and possibly causing plant stunting. Granular contact nematicides work best with good soil moisture conditions.