White Mottled Azalea Leaves - Knowledgebase Question

Rockville, MD
Question by warren_lehre
September 24, 1998
The leaves on several of my azaleas have developed a white, mottled appearance. Typically this discolored area occurs along the middle of the leaves, while the margins of the leaves retain a healthy green color. I haven't seen galls or anything powdery.

Is this a fungus problem? If so, is it appropriate to treat now, in the early Fall?

Answer from NGA
September 24, 1998


It sounds like your azaleas may have suffered an infestation of lace bugs this summer. If the damage is still occurring they can be controlled with repeated applications of insecticidal soap or Sevin according to the label instructions. Keep an eye out for them next year, too, beginning in late spring. To be sure that's the problem, you might wish to take a sample to your County Extension agent to verify the cause of the damage and suggested controls. Their telephone number is 590-9638.

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