willow sawfly

noun

: any of numerous sawflies that infest the willow: such as

a

: a large American sawfly (Cimbex americana) whose larva is pale greenish with a black dorsal stripe

b

: a steel-blue sawfly (Dolerus arvensis) or a related smaller brownish fly (D. bicolor)

c

: a black sawfly (Nematus ventralis) whose yellow-spotted blackish larva infests also the wild cherry

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