Saskatoon sawfly

Identification
- adults are a 6 mm long sawfly with yellow with brown markings
- mature larvae are 6 mm long with yellow-brown head
Life cycle
- appears in May, just prior to maximum flowering (25% bloom)
- lay eggs in the nectaries of flower blossoms, the position is marked externally by a dark scar along the calyx of the flower
- one egg is laid in each flower
- eggs hatch after petal drop
- the larvae feed on the top of developing fruit
- on average, one larva will ruin 2 fruit per cluster
- the last fruit attacked is completely hollow
- mature larva drop out of the fruit at the end of June
- overwinters in the soil
- pupates in the spring