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Definition of willow sawfly
: 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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