Host: burley tobacco (Nicotiana tabacum (burley type)
Description: 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.
Image type: Field
Image location: United States
Name: R.J. Reynolds Tobacco Company Slide Set
Organization: R.J. Reynolds Tobacco Company
Country: United States