Abstract
The patterns of occurrence and importance of insects change as the prevalence of their hosts change. Prior to land clearing in Illinois and the introduction of exotic trees, pine sawflies were probably rare due to the scarcity of hosts. Only 2 pine species were a part of the original forest. Short leaf pine, Pinus echinata Mill., ranged N into the S tip of Illinois, and E white pine, Pinus strobus L., occupied a small acreage in the extreme NW part of the State. All other pine species have been introduced. Pines have been planted for landscape enhancement for many years, and within the last 40 years extensive areas have been planted for timber and Christmas tree production. These plantings now provide suitable environments for 6 sawfly species.
Published Version
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