Why does your Rhododendron brachycarpum have sticky leaves? Diagnose the cause and fix it with our step-by-step guide.
Aphids are small, soft-bodied insects that pierce the tender new growth of Rhododendron brachycarpum to suck sap, excreting a sugary substance known as honeydew. This residue creates a sticky coating on the leaf surfaces and can lead to sooty mold.
Scale insects attach themselves to the stems and leaf petioles of the plant, feeding on phloem sap. Their excretion of honeydew results in a persistent sticky film that can eventually attract secondary fungal growth.
While not a direct cause of stickiness, sooty mold is a black fungus that grows on the honeydew left by sap-sucking insects. The presence of this dark, velvety layer often accompanies the sticky sensation on the leaves.
Mealybugs are related to scale and produce honeydew as they feed on the Rhododendron's sap. They are often covered in a white, cottony wax that can make the surrounding leaf area feel tacky.
Your plant might also be experiencing one of these issues:
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