Why does your Rhododendron niveum have sticky leaves? Diagnose the cause and fix it with our step-by-step guide.
Aphids are common pests for Rhododendrons that pierce the tender new growth to suck sap, excreting a sugary substance known as honeydew. This substance creates the characteristic sticky residue on the leaf surfaces.
Scale insects attach themselves to the stems and leaves of Rhododendron niveum and feed on plant fluids, leaving behind sticky honeydew. Unlike aphids, they are often stationary and look like small bumps or shells.
While not the primary cause of stickiness, sooty mold is a black fungus that grows specifically on the honeydew left by sap-sucking insects. The presence of a black, velvety coating indicates a pre-existing pest problem.
Small, winged whiteflies can congregate on the undersides of Rhododendron leaves, feeding on sap and secreting honeydew. They are often more mobile than scale insects but produce similar sticky symptoms.
Your plant might also be experiencing one of these issues:
English
Italiano
