Sanitation will help reduce foliage infection. Light green or yellow, irregular rings occur in leaves. Plants tend to be smaller and low in vigor. Destroy diseased plants. Propagate from healthy plants.
Foliage becomes light green and finally a greenish yellow.
The veins tend to remain green. Foliar applications of iron sulfate or copperas are usually effective if several applications are made when leaves are forming. See Root Knot Nematode . Spray at 7-10 day intervals during wet or humid weather with a recommended fungicide. Expanded, brown and often zoned spots on the leaves.