Downy Mildew
(fungus - Peronospora manshurica): First symptoms appear as indefinite
yellowish-green areas on the upper leaf surface. Later, these areas become light
to dark brown spots with yellow-green margins. Grayish downy tufts of mold growth
appear on the lower surface. Severely infected leaves may defoliate prematurely.
The fungus grows within pods covering the seed with a white crust of spores. The
disease is spread with infected seed and is carried over on plant debris. Practice
crop rotation, use disease-free seed, and plow under plant residue.
