White Substance on Branches of Lilac Bush

What is the white substance (looks like a white power) on the bottom going toward the to of the branch. Will it kill the lilac? What, if anything, can be done? Thanks for any help.
Olga West

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1 Comment To "White Substance on Branches of Lilac Bush"

#1 Comment By Nikki On 03/04/2011 @ 7:06 am

It has powdery mildew. These articles will help:
https://www.gardeningknowhow.com/problems/get-the-cure-for-powdery-mildew.htm ^[1]
https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm ^[2]

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[2] 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

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