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White powder on the surface of leaves.
Larvae of the Synanthedon tipuliformis moth tunnel their way through the canes, feeding on the pith. They can cause serious damage to the currant bush if left unchecked. If you notice any dieback or unhealthy appearance of the canes, cut open a stem to investigate. If it has a tunnel bored into the middle, it's caused by Currant Clearwing moth larvae.
Cut weak or unhealthy looking canes off as close to the ground as possible. Burn the offcuts to destroy the larvae.