Why does your Rhododendron polycladum have fine webbing? Diagnose the cause and fix it with our step-by-step guide.
The presence of fine, silk-like webbing on the undersides of leaves is a hallmark sign of spider mite infestation. These pests thrive in hot, dry conditions and pierce plant cells to suck out chlorophyll, leading to stippling and eventual leaf drop in Rhododendrons.
A specific species highly common in container-grown Rhododendron polycladum, characterized by rapid webbing production when humidity levels drop too low. This leads to a dusty appearance on the foliage and premature senescence of older leaves.
While thrips primarily cause silvery scarring and distorted growth, heavy infestations can sometimes be associated with secondary silk production or movement within fine debris. They are particularly destructive to the tender new growth of Rhododendron species.
Your plant might also be experiencing one of these issues:
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