Ireland

Raspberry beetle

Byturus tomentosus

The adult is approximately 4mm long, covered with yellowish-brown hairs which later fade to greyish brown. The larva are 6-8mm long, creamy white, with brown markings on their upper surface. They can often be seen crawling around the punnet after the fruits have been picked.The beetles lay eggs on the flowers which hatch into pale brown larvae. The larvae feed on the developing fruit and cause the fruit to appear smaller and shriveled.
The pest damages both wild and cultivated raspberries and also blackberries. The beetles eat portions of the flowers and young leaflets and lay their eggs between the stamens and pistils. The larvae tunnel in the developing fruit which remain small, become pale in colour, fade or rot. The larvae then drop to the soil and pupate underground.