willow sawfly

noun

Definition of willow sawfly

  1. :  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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