Symptoms
Older leaves show a purple discoloration, starting at the interveinal areas and spreading all over the leaf blade. Numberous small, whitish spots are distributed irregularly over the leaf. They are separated by a reddish ring from the adjacent green tissue, Striking purple dots develop on the buds.
Reasons
Phosphorus deficiency
As cottonseed contain large reserves of P, the early growth rarely suffers from its deficiency.