Why does your Rubus ursinus have fine webbing? Diagnose the cause and fix it with our step-by-step guide.
These microscopic arachnids thrive in warm, dry conditions and feed on the underside of Rubus ursinus leaves, injecting toxins that cause stippling. The fine webbing is a protective silk structure created by the mite colonies as they migrate across the foliage.
Common in many Rubus species, these mites produce fine silken webs particularly visible during periods of environmental stress. They cause a characteristic bronzing or discoloration of the blackberry leaves.
While more known for dense, large silk nests, early instar larvae can produce fine silken strands around terminal buds and young leaves of Rubus species. This is often accompanied by visible caterpillar movement within the silk.
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