Notes on Raspberry Insects - Raspberry sawfly

Identification

Raspberry sawfly adults are tiny (6 mm), stout black wasps. They lay eggs in raspberry leaves. Larvae are bristly and green and eventually reach 12 mm in length. Larvae are very similar in colour to the leaf and generally feed on the underside. Larvae feed mostly between the veins, which causes long holes and shredding. In severe infestations, leaves are skeletonized; however, in most cases vigorous raspberry plantings can easily tolerate obvious feeding from sawfly larvae. They feed for approximately two weeks, then drop to the ground where they overwinter in cocoons.

Raspberry sawfly larvae

Raspberry sawfly larvae

Period of Activity

Adult sawflies are present in June and sporadically through the summer. Larvae feed for approximately two weeks. There is one generation per year.

Monitoring

Watch new growth on primocanes for sawfly feeding. Damage to leaves from sawfly larvae feeding is easily confused with feeding from raspberry fruitworm. Raspberry fruitworm beetles tend to be active earlier in the season and feed on laterals that develop on fruiting canes. Raspberry sawfly larvae tend to feed on new primocane growth.

Management notes

The pest is easily controlled with insecticides.

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Author: OMAFRA Staff
Creation Date: 17 May 2006
Last Reviewed: 17 May 2006