Onions - Powdery Mildew
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Powdery
mildew
(fungus - Leveillula taurica): Powdery mildew occurs rarely in the Lower
Rio Grande Valley of Texas. The earliest symptom is a pale discoloration
of the leaf [Picture]. Circular spots with white,
powdery growth eventually occur [Picture]. There are
no control recommendations, since the disease is not a serious problem.