What is causing black spots and yellow leaves on my holly tree?
Sounds like the holly has an infestation of aphids. The black is from the aphids-they suck the sap from the leaves and have a waste product called "honey dew" and a black mold grows on this honey dew. If you control the aphids you will control the "black". Spray the leaves (top and underside)with a systemic insecticide for aphids-check with a local garden type store for the correct insecticde for your area. good luck.
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I have a beautiful 10 foot tall American Holly tree that has been extremely healthy until the beginning of April. The holly is at least 20 years old. Now it has lots of yellow leaves some with black spots. I am afraid it is dying. What can I do to save it?
Hardiness Zone: 7a
Hilda C. from Alexandria, VA