Ozone may be produced during electrical storms or may be brought down from the upper atmosphere by strong down drafts. A scorced appearance occurs primarily on the upper leaf surface. Damage is usually evident in 4-5 days, and scorced leaves soon drop. Spanish varities are much more susceptible thatn Runner varieties. Incompatible mixtures of chemicals may also produce such burns.
Veins remain green, and the yellow color develops between veins.
Severe deficiency may cause leaves to be almost white. Deficiencies of other micronutrients such as zinc and copper may produce a similar condition in peanuts. Chemical analysis of the plant tissue is the only sure way to differentiate among minor element deficiencies. This insect feeds along the mid rib producing yellow leaf tips. Heavy feeding damage gives a yellow appearance to the field.