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In the spring of every year my holly bushes attract flies an abundance of flies. How can I stop this? Also my leafs on the holly are getting some kind of soot on them every year, what could this be? And how can I solve this?
Your holly bush has a fungus, called Sooty Mold. Spray the leaves with horticultural oil - try to coat as much of the leaves and stem as possible and you'll get rid of the insects causing the problem.