Downy mildew (Plasmoparaviticola) affects many plants and appears as yellow to white patches on the upper surfaces of older leaves.
On the undersides, these areas are covered with white to grayish, cotton-like fungi. These “downy” masses are most often noticed after rain or heavy demand disappear soon after sunny weather resumes. As the disease progresses leaves may eventually turn crisp and brown and fall off even though the plant has ample water.
Herbal fungicides for Downy mildew can be used for cotton, potato, ground nut, papaya, chili, tomato, brinjal, cumins and all other vegetables, fruits & flowers.