Last summer, my azaleas got a bleached-out appearance and the undersides of the leaves were covered with small, black tar-like spots. What causes this and how do I prevent it?
Azaleas are susceptible to an insect called Lace Bug (or Lacewing).. Damage results from the insect sucking out cell sap, resulting in mottling of leaves. The black tar spots are actually insect excrement. The tiny insect can be seen with the naked eye or a fifteen power hand lens. The wings of this pest are lacy. Azaleas should be sprayed with an appropriate insecticide such as Orthene. Note: Azaleas in full sun are more frequently attacked by this insect than azaleas in the shade.
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