Byturus Tomentosus

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Byturus Tomentosus

 

a raspberry fruitworm beetle of the family Byturidae; a dangerous pest of raspberries. Body length, 3.8-4.3 mm. Byturus tomentosus is gray-black and covered with dense, rusty yellow hairs. Distributed in Europe and Asia, it is found in the USSR in the Caucasus and Western Siberia. The beetle gnaws on the buds and young leaves of raspberry, blackberry, stone bramble, and cloudberry plants, while its larvae develop in the ovaries and aggregate fruits. The damaged berries rot. One or two beetles can damage 4-6 percent of the berries on a bush. The insect winters in the soil in the imago and larval phases. Control measures include tilling the soil under the bushes, removing and destroying wormy berries during routine gathering, and spraying the bushes with insecticides at the first appearance of flower buds (seven to ten days before flowering).

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Immediately after flowering, the same treatment is applied to raspberries to protect against raspberry beetle, while a sulphur spray also applied after flowering holds back botrytis on strawberries.
Raspberry problems IF your early summer varieties aren't doing well, it may be that raspberry beetle is to blame.
Pippa says: This sounds like the raspberry beetle and it's everywhere this year.
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Examine forming raspberry fruits late in the month for greyish depressed druplets and the presence of tiny white grubs - signs of infestation by the raspberry beetle.