Sawflies superficially resemble caterpillars but are taxonomically very different. Sawflies are the larval stages of a group of wasps. Unlike caterpillars, which have only two to four pairs of prolegs, sawflies have prolegs on every abdominal segment. It's important to distinguish sawflies from caterpillars because sawflies are not susceptible to Bacillus thuringiensis (B.t. or Dipel), a widely used microbial insecticide for caterpillars. Adult sawflies are small (8 to 25 mm), dark, flylike wasps. Most larvae are either leaf-chewing and caterpillarlike, or maggotlike leaf miners that cause leaf blisters or leaf blotches.
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