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Powdery Mildew Potato disease

Thursday, September 10th, 2009
Powdery mildew, a Biotrophic Fungus
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(Erysiphe cichoracearum)

Powdery mildew is widely distributed on many host plants and developsĀ  also on potato under arid conditions with high humidity.

Symptoms of Powdery Mildew

Old infections superficially resemble late blight as leaves turn black, die, and drop from the plant. Stems may also be infected. Initially, infected potato leaves are covered with whitish spore masses resembling soil residues, dust, or spray deposits.
The disease requires high humidity, but seldom develops where water falls on the leaves as rain or sprinkler irrigation.

Management

Where the disease is severe, biweekly applications of liquid sulfur formulations may be necessary.


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