Q.Mature kumquat trees
What do u do about black spots on the underside of the leaves on a mature kumquat tree?
Downtoearthdigs
Answered on June 11, 2018
This sounds like it could be Black Citrus Spot.
This link will help you.
http://www.crec.ifas.ufl.edu/extension/black_spot/citrus_black_spot.shtml
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