A Guide to Grapevine Abnormalities in South Africa - P.G. GOUSSARD

Rodents (mice) damage.

PHOTO 379. Ring-barking activities by rodents (mice) are associated with stripping of bark and phloem over large sections (even around trunks) – which causes cambial zones to be exposed.

PHOTO 380. Feeding activities of rodents as in Photo 379 usually take place below the soil surface, whereafter excessive callus and root formation is initiated in an attempt to keep affected grapevines going. Note that original roots have already died or are in the process of doing so.

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