Downy mildew — Maize

Symptoms

Yellow or pale-green chlorotic stripes develop along the leaves, sometimes involving only part of a leaf. White, downy fungal growth may appear on the upper or lower leaf surface, especially under humid conditions and in the early morning. Plants may become stunted, with shortened internodes. Leaves may become narrow, thick, leathery and abnormally erect. Systemically infected plants may produce malformed tassels, fail to produce normal ears or form small, poorly filled ears. In crazy top, normal floral structures may develop into leaf-like structures, with excessive tillering or abnormal ear shoots. In brown stripe downy mildew, narrow yellow stripes bounded by veins may later turn reddish or purple and merge into larger blotches.