Image Number: 1440048

Plants affected by root-knot nematodes are characteristically stunted and yellow and appear in irregular patches within a field. Root knot is most easily identified by the knots or galls which develop on the roots of infected plants. These galls vary from pinhead size to many times thicker than the normal root. They are irregular in shape but are usually either spindle-shaped or spherical. Affected plants wilt rapidly during dry weather and may even wilt in the presence of adequate soil moisture. Plants infected with root knot often exhibit symptoms of drought or nutritional stress. Severely affected plants may die. Other soil-borne diseases such as Fusarium wilt or black shank are often more severe when root knot nematodes are present. In northern burley tobacco areas the disease is seldom found unless tobacco is planted in old garden site, sandy river bottoms, or following vegetables.
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Image location:
United States


Kingdom: Animalia
Phylum: Nematoda
Class: Chromodorea
Order: Tylenchida
Family: Heteroderidae
Genus: Meloidogyne
Subject: Meloidogyne spp.


Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Solanales
Family: Solanaceae
Genus: Nicotiana
Subject: Nicotiana tabacum (burley type) L.
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Image uploaded:
Monday, January 1, 1990
Image last updated:
Wednesday, May 18, 2011