Yes, they can. Fungicides - such as potassium bicarbonate, neem oil, sulfur, and copper-based products - can help permanently get rid of powdery mildew. When should I spray to prevent powdery mildew?

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During the fall and spring planting season, starter fertilizers or bone meal are often promoted for incorporating into soil.

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Hinch also suggested using Dettol Mould and Mildew spray and Mould Magic to eliminate the unsightly stains. Dettol Mould and Mildew spray costs £3.50 from Tesco and £3.75 from Sainsbury's.