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Black powdery substance on my Holly

NJ, United States Us

My dwarf holly bushes have a black powdery substance that has appeared on the lower leaves and seems to be spreading. What is this? How do I treat it?

On plant Ilex



Sounds like scale insects. They attach themselves to stems and suck the sap. Their poo drops down onto lower leaves and a black fungus grows on it. Sort out the scale insects and the black stuff will go. Only problem is, they are not all that easy to get rid of. I ended up getting rid of my Pyracanthus bushes that were effected :-(

29 Apr, 2008

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