Q.lilac bushes with black spots
One of the three lilac bushes I just planted is showing black spots that go through the leaves. There is no sign of aphid infestation or any bug that would be causing the spots. What would it be? Thanks.
Downtoearthdigs
Answered on May 7, 2015
I believe your lilac may have a bacterial blight, which can be treated with a copper fungicide.
Read the links below to identify it specifically.
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/common-lilac-problems.htm
http://extension.oregonstate.edu/gardening/how-recognize-treat-and-avoid-lilac-bacterial-blight
http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/management-of-leaf-spot-diseases/
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