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Prenocerus supernotatus, or the American Currant Borer, feeds upon the pith of the stalk.

There is another currant borer, an European, which is confined to young shoots; as it is not the larva of a beetle, but of a butterfly, it will be treated in its proper place.

The perfect insect resembles that of the Currant Borer, and makes its appearance near the end of summer, leaving its chrysalis skin projecting from the hole in the bark, whence it had escaped.

This is not desirable when the bushes are liable to have the stems destroyed by the currant borer.