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Gardening Know How Questions & Answers - https://questions.gardeningknowhow.comMy 10 yr old Japanese hollies have a white powdery substance on the stems and branches. The leaves are unaffected. One of the hollies is especially bad looking where the leaves and branches are brown and dead. I did not notice the fungus type stuff as you have to look directly into the bush and spread the branches to see it. I never would have noticed anything until the one plant began to turn brown in sections.
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[1] https://www.gardeningknowhow.com/nonorganic/get-the-cure-for-powdery-mildew.htm: https://www.gardeningknowhow.com/nonorganic/get-the-cure-for-powdery-mildew.htm
[2] https://www.gardeningknowhow.com/problems/powdery-mildew-homemade-and-organic-remedies.htm: https://www.gardeningknowhow.com/problems/powdery-mildew-homemade-and-organic-remedies.htm
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1 Comment To "Japanese Hollies have a white powdery substance"
#1 Comment By Downtoearthdigs On 07/25/2016 @ 9:37 pm
Powdery mildew is caused by fungus that attack Holly leaves, sometimes covering them entirely with a thin white powdery coating. For more information, here is an article that you may find helpful: https://www.gardeningknowhow.com/nonorganic/get-the-cure-for-powdery-mildew.htm [1]
https://www.gardeningknowhow.com/problems/powdery-mildew-homemade-and-organic-remedies.htm [2]