None Most varieties are somewhat resistant. Maintain soil pH at 6.0 to 6.5. Maintain high soil levels of phosphorus and potassium. Irregular yellow areas appear between veins and on margins of oldest leaves first. Centers of yellowed areas may turn brown.
Defoliation is slow.
Plants are usually stunted and vascular discoloration occurs. Bolls may open prematurely. None Plant tolerant varieties, maintain soil pH 6.0 to 6.5 and use recommended rates of nitrogen and potash. Lance nematode Hoplolaimus spp. Plant may defoliate following drought.