View source for Podosphaera xanthii (powdery mildew of cucurbits)

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=Overview=
Powdery mildew, caused by the fungus Podosphaeria xanthii, is much more widespread on cucurbits than downy mildew, especially during dry hot periods. 

=Symptoms and Signs=
This disease is characterized by a white or brownish, mealy growth found on the upper and lower sides of the leaves and young stems. If plants are severely attacked, the leaves and young stems may wither and die. In less severe cases, the plant may be weakened or stunted. Early defoliation resulting from the disease may cause premature ripening or sun scald. 

=Management=
The use of preventive fungicide applications is the most effective means of suppressing powdery mildew. However, some varieties may demonstrate tolerance to this disease. Fungicides used in conjunction with tolerant varieties offers the most complete disease management program for powdery mildew on cucurbits. 



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