Powdery mildew is an infectious fungal disease caused by different species from the Erysiphales order. It causes characteristic powdery spots on the leaves, stems, fruits, and other parts of the plant.
The first sign of powdery mildew is pale yellow leaf spots. White powdery spots can form on both upper and lower leaf surfaces, and quickly expand into large blotches. The large blotches can cover entire leaf, petiole and stem surfaces. When powdery mildew infects the majority of the foliage, the plant weakens and the fruit ripens prematurely.
How to prevent:
Control is possible with triadimefon and propiconazole. It is also possible with hexaconazole, myclobutanil, and penconazole.
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