Sawflies don’t sting but their appearance in your yard can create problems and once they lay their eggs (larvae) which resemble caterpillars, devour large amounts of leaves in a short time. They're a group of insects named after the saw-like ovipositor, the tube-like organ with which the female sawflies cut holes in plant tissue to deposit their eggs. The damage from sawflies depends on two factors: the number of larvae feeding on the plant, and the size and age of the host. One effective treatment on sawfly larva is by applying insecticides only when the larvae are still on the plant.

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Source: The Spruce