They key identifier is that downy mildew has the white powder on the under side of the leaves only whereas powdery mildew has a white powder on both the underside and top of the leaves. To prevent powdery mildew from forming in the first place, avoid low-temperature, high-humidity environments. Powdery mildew hates water; the only caveat with this method is to do it early in the day so the foliage completely dries before cooler evening temperatures arrive. Powdery mildew is far more common compared to downy mildew but it is important to recognise the difference between the two if you plan to treat either of them. You can tell if your pumpkins are infected with downy mildew, because there will be yellowish spots on the upper surface of the leaves and purple to gray spots on the bottom of the leaves. If the powdery mildew has covered the plants’ leaves, the photosynthesis depleted and the infected leaves may fall. One of the most common fungal diseases of strawberries is powdery mildew. Interestingly, an effective means of preventing and treating powdery mildew is to spray the foliage of your plants daily with water from the hose. Using Fungicidal Sprays Fungicides that work on downy mildew are ineffective on powdery mildew, and vice versa. Preventing the spread and/or severity of powdery mildew is the most cost-effective way of dealing with the fungus. A pilot project in Kings County has shown promising results in the use of UV light to help control a damaging mildew and mites on strawberry plants. Remove infected tissue by mowing strawberry beds. Then, treat with fungicides like JMS Stylet oil, Nova 40W, and Rally 40 W, once flowering begins. Treat powdery mildew by applying fungicide. This powdery mildew can kill the plants. The best defense against powdery mildew is to plant resistant varieties of strawberries. Using a mixture of 40% milk and 60% water is a great way of treating powdery mildew. Milk and Whey. 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