Why does your Abies lasiocarpa have fine webbing? Diagnose the cause and fix it with our step-by-step guide.
The presence of fine webbing on the needles of Abies lasiocarpa is a classic sign of spider mite infestation. These tiny arachnids pierce the needle cells to feed on sap, causing the needles to discolor and eventually drop.
Certain mite species create silk structures to protect themselves while feeding on the coniferous foliage of subalpine fir. This results in a fine, silken mesh that can coat entire needle clusters.
Prolonged lack of moisture in subalpine environments weakens the Abies lasiocarpa's natural defenses, making it highly susceptible to mite populations that produce webbing. The webbing is often a secondary symptom of an ecosystem under hydrologic stress.
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