Post category: Raspberry beetle
Raspberry beetle is a fairly common pest of raspberries, blackberries and loganberries, being the white grubs often found in wild blackberries. The grub enters through the stem end, which will be brown instead of white on an affected berry. It is most common in rural areas.
If the pest has attacked in the past, spray after flowering finishes, with a general garden insecticide. This spray is timed to prevent the grubs entering the fruit.