Berberis sawfly

Berberis sawfly became established in south-east England in about 2000. It has since spread throughout most of England and into parts of Wales. It is the only insect that feeds on Berberis and Mahonia, likely to cause severe defoliation.

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Berberis sawfly larvae.

Quick facts

Common name Berberis sawfly
Latin name Arge berberidis
Plants affected Berberis, especially B. thunbergii, and Mahonia
Main symptoms Leaves are eaten by caterpillar-like larvae. Plants may be completely defoliated
Caused by Caterpillar-like larvae of a sawfly
Timing May-October

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