Azalea Plants

Azalea Disease

Anonymous added on April 24, 2014 | Answered

We have recently noticed a growth on the tips of our azaleas. Lawn maintenance tells us it is gall, but your description of gall does not match the stone colored growth we are experiencing. The azaleas are about 5 feet tall and mature. We are planning to trim them back in the next few weeks, as we do each year. Will trimming take care of the problem, or do we need to take more action?

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Certified GKH Gardening Expert
Answered on April 24, 2014

It is most likely azalea gall, which will commonly produce stone-like growths that may be pale yellow, light green or brownish in color. At any rate, the leaves will need to be removed and destroyed (including any foliage on the ground around the shrubs), as this is caused by a fungus and will spread. You can also treat the shrubs with neem oil to help control the fungus. It will also help with any pest issues that may arise as well.

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