Why does your Rhododendron tomentosum have sticky leaves? Diagnose the cause and fix it with our step-by-step guide.
Aphids are sap-sucking insects that pierce the tender leaves of Rhododendron tomentosum to feed, excreting a sugary substance known as honeydew. This sticky residue is highly characteristic of aphid activity on Ericaceous plants.
Scale insects attach themselves to the stems and leaf petioles of Labrador Tea, extracting nutrients and secreting honeydew. The residue often accumulates on the leaf surfaces below the insect colonies.
While not the primary cause of stickiness, Sooty Mold is a fungus that grows directly on the honeydew left by insects. This creates a black, velvety coating over the sticky residue on the leaves.
Some members of the Ericaceae family possess glands that secrete nectar to attract predatory insects. While less common as a primary symptom in this species, it can manifest as localized sticky patches.
Your plant might also be experiencing one of these issues:
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