Why does your Rhododendron tomentosum have fine webbing? Diagnose the cause and fix it with our step-by-step guide.
The presence of fine webbing is a classic indicator of spider mite infestation, which thrives in the warm, dry conditions that Labrador Tea may experience if its bog-like humidity drops. These mites pierce the leaf cells to feed, causing stippling and eventually silk webs to protect their colonies.
Certain small hemipteran insects can produce silken structures or communal webbing while feeding on the underside of Rhododendron foliage. This leads to chlorotic spotting and a messy appearance on the leaf surface.
If the microclimate around the Northern Labrador Tea becomes excessively dry, decaying leaf edges or broken fungal hyphae can sometimes be mistaken for fine webbing. This is usually accompanied by significant browning of the leathery leaves.
Your plant might also be experiencing one of these issues:
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