Tomato Disorders


Root Knot Nematode
Meloidogyne incognita, M. javonica, and M. hapla

Found worldwide

Damage Symptoms

Plants are stunted with some yellowing. Severely affected plants may wilt. A careful look at the root system will reveal galls on primary and secondary roots. Galls become large and are very obvious.


Conditions for Development

This nematode has a very wide host range. It can survive as dormant eggs for a few months. Warm temperatures and light sandy soils are conducive for its development.


Control

Use crop rotation; flooded rice in particular greatly reduces root knot populations. A few resistant cultivars are available. Soil fumigants or nematicides may be used. Plowing during the fallow season will expose nematodes to drying and eliminate weeds that can host this pest.