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Root-knot nematodes are microscopic worms that live in the soil and in plant roots. Affected plants are usually stunted, discolored and may die. Knots or galls develop on the roots.

When nematodes are not yet present, move the garden location every year, purchase disease-free plants, pull up and dispose of roots immediately after harvest, and use resistant cultivars 

When root-knot nematodes are present, relocate the garden to a nematode-free area. Use nematode resistant tomato cultivars. Establish a rotation system which reduce root-knot nematode populations in soils