Biotic Diseases. Fungal diseases (cont.). Downy Mildew. A disease caused by a group of fungi belonging to the family Peronosporaceae class oomycetes. Infect a wide range of plants including grain crops, vegetables, field crops, ornamentals, shrubs and vines.
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Fungal diseases (cont.)
White to grayish powdery mildewy growth as patches or spots turns to yellow brown and finally black cleistothecia. Symptoms appear first on upper side of leaf then lower side. It also affects all plant organs.