Q.How to treat Downy Mildew?
The hydrangea is between the house and driveway. Afternoon sun. Abundant blossoms. Leaves are not yellow. White puffy spots underside of lower leaves.

Downtoearthdigs
Answered on July 5, 2015
Here is a link for you with more information.
Allowing more air circulation is the most important preventative measure.
https://www.gardeningknowhow.com/plant-problems/disease/downy-mildew.htm
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