One azelea has black stems and occasional white balls indicating a fungus. What can I do?
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Azelea Diseases
Downtoearthdigs
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on April 9, 2017
This is Bark Scale and you should treat your plants with an insecticidal soap.
Here are some links with more information.
https://www.gardeningknowhow.com/ornamental/shrubs/azalea/azalea-bark-scale.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/homemade-soap-spray.htm
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