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Powdery mildew is the disease which causes powder-white dust to appear on leaves and lower leaves and stems to turn grey. The disease in question reflects the work of fungi within the Erysiphales order. Its control and prevention generally require concerted efforts with fungicides, resistant varieties, sanitation, and ventilation.

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Q: What disease causes white powdery dust to appear on leaves and the lower leaves and stem to turn grayish?
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