powdery mildew on lilac bushes - Ask Extension
Is it necessary to treat this? I'm hearing different viewpoints. Some say no need to treat. A neighbor treated them with liquid copper solution.
...
Knowledgebase
powdery mildew on lilac bushes #772534
Asked September 21, 2021, 1:00 PM EDT
Is it necessary to treat this? I'm hearing different viewpoints. Some say no need to treat. A neighbor treated them with liquid copper solution.
Thank you!
Arapahoe County Colorado
Expert Response
Hello Patrice,
Great question. Incidence of powdery mildew seems high in spite of the high temperatures and low humidity. Powdery mildew does no real damage, but makes the leaves look damaged. Hosing the leaves off with a good water stream helps, and an application of a copper or sulfur fungicide may help...
Not a major worry, but perhaps something to address.
Thank you, Ron
