This is the most serious insect pest of currants and gooseberries, with the latter being the favored host. Foliage is consumed by several small, spotted, caterpillar-like larvae. The adults are sawflies about the size of a house fly. There are two generations per year, with damage occurring in spring and again in late summer.
Malathion and rotenone will control this insect. Start looking for damage shortly after the leaves have fully expanded. Usually the second generation is less severe than the first and does not require treatment.
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