Tomato Diseases: Root Knot (Root knot nematode - Meloidogyne)

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Nearly invisible nematodes which attack the roots of various plants are found wherever tomatoes are grown - especially in areas where crop rotation is not practiced.

The attack results in the formation of root knots or galls that range in diameter from a pin-head to a full inch or more. Soon the whole outer area of the root is discolored, and may rot.

The results are not apparent above ground except that plant growth and yield are retarded. Infected plants wilt very easily on a hot day, and they may be stunted in appearance and somewhat yellowish. Some are nearly killed.

The best control for nematodes is the planting of marigolds along with tomatoes, or, even better, put tomatoes in parts of the garden where marigolds grew during previous years. The root exudate from marigolds has a powerful inhibiting effect on nematodes, and remains effective in the soil for 3 years. Interplanting of marigolds and tomatoes is effective the same year.

To control root knot, examine the roots of tomato plants, and discard any with root knots or rotten roots. Never use soil known to have had a nematode infestation the previous season. Plant marigolds instead. Burn infected plants.

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