Abstract
The Swaine jack-pine sawfly, Neodiprion swaine Middleton, has been reported in outbreak frequently in Canada, but only once in the Lake States. Reasons for this apparent natural control were sought in a survey of biotic enemies of the sawfly in central and southern Wisconsin. Parasites were reared from eggs, cocoons from feeding-instar collections, cocoons field recovered, cocoons from sleeve cages, and cocoons purposely exposed in cages at ground level. Parasites and predators collected are listed, and general comments on their relative importance lire included.
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