Raspberries Many insects are dislodged from raspberry foliage during the machine-harvesting process. These may include leafrollers, loopers, cutworms, small gnats, plant bugs and several different species of weevils.
Spiders are often present as well.
Many of these insects do not directly damage the plant but their mere presence in harvested fruit can pose a contamination problem. The most serious contaminants are weevils and a variety of cutworms. Most of these insects are adequately controlled with an insecticide application prior to the onset of harvest. Peak emergence is usually in late May to early June. Above ground foliar feeding from BVW does not usually cause significant damage to raspberry plants but if not controlled prior to harvest, adult weevils are a serious harvest contaminant.