This section is from the book "Commercial Gardening Vol3", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
A small beetle, from 1/6 to 1/7 in. long, of a pitchy-brown colour, clothed with golden-brown pubescence, which is found flying about as soon as the Raspberry blossom buds show. The beetles then eat the buds, cutting some off; as the flowers open they get into them, and on from that period they lay their ova in the blossoms. The beetles also eat the various parts of the blossoms and ruin them.
On dull days the beetles shelter in the opened and just-opening blossoms, and are difficult to move, but on warm days they fly about and are active. They also feed and lay their eggs in Loganberry and Brambles,, and do much harm to the former fruit.
The larva - the so-called Raspberry Maggot - lives in the core or receptacle of the berries, where it forms dark tunnels, and later escapes from the fruit, and, if mature, either falls to the ground or gets into any crevice in the canes or stakes. The maggot is dull yellowish or grey, with brown markings in the middle of all the segments, six jointed legs in front, and the anal segment with a more or less pronounced rudimentary leg and two pointed curved spines; length, 1/3 in.
All canes cut back should be burnt. Land around the stools may be treated in early spring, before the canes burst into full bud, with vaporite or soot and lime. Jarring, or shaking of the beetles by women, is one certain means of preventing the enormous damage the larvae may do.