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Azalea Plants

Q.Diseased Tree Azalea

Anonymous added on April 29, 2011 | Answered

We have tree azaleas that the branches are turning black color with a black powder residue that falls to the ground. There are also white looking (I think) powdery spots on the branches. Is this treatable?

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Certified GKH Gardening Expert
Answered on April 30, 2011

This is sooty mold, usually caused by pests--in this case probably azalea bark scale. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/shrubs/azalea/azalea-bark-scale.htm

I would treat the shrubs with neem oil, which should take care of the sooty mold as well as the pest. Here is more info: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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