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Gardening Know How Questions & Answers - https://questions.gardeningknowhow.comHave a crimson maple tree with leaves covered in a white residue top and bottom. Is it possible that this is white powdery mildew? If so, how do you treat an entire tree? If not, what else could it be? The tree is approximately 50 years old and is in full sun.
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[1] https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm: https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm
[2] https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
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1 Comment To "Crimson Maple Tree Problem"
#1 Comment By Nikki On 07/06/2011 @ 8:59 am
Yes, this sounds like powdery mildew. Neem oil is oftentimes effective. Here is more information: https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm [1]
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm [2]