The limited set of photographs shown below was chosen to depict a range of plant ages and a range of reactions but they do not portray all possible combinations of symptoms. Chlorotic spots due to HPV always occur in a pattern associated with veins and are never sunken or watersoaked. Maize screening trial all planted the same time. Row on left is a very susceptible commercial hybrid. Plants are severely stunted and chlorotic but no red or purple pigment develops on this genotype.
Many plants are dead, others are dying, symptoms are on all leaves from the top to the bottom.
The middle row is moderately susceptible. Plants show some stunting, purple leaf tips and margins and numerous chlorotic spots. Symptoms are most severe on lower leaves and progressively milder up the plant, top leaves look relatively healthy. The right row is a resistant hybrid with few or no symptoms on any leaves. Closeup view of a young plant showing characteristic chlorotic spots.