Why does your Espostoa melanostele have fine webbing? Diagnose the cause and fix it with our step-by-step guide.
The fine webbing is a classic sign of spider mites, which thrive in the warm, dry environments often experienced by Espostoa. These arachnids pierce the cactus skin to suck out fluids, leading to stippling and eventual desiccation of the cactus ribs.
Specific strains of red spider mites are highly prevalent in greenhouse-grown cacti like Espostoa. They create dense silk webs to protect their eggs and move between the characteristic long, white hairs of the Peruvian Old Man Cactus.
While not a biological web, very low humidity can cause certain fungal hyphae or dust particles to become trapped in the cactus's dense hair, appearing as a fine, matted web-like structure. This often occurs when the plant is kept in overly dry indoor environments.
Your plant might also be experiencing one of these issues:
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