A logistic regression equation that may prove capable of predicting the susceptibility of Illinois forest stands to defoliation by the gypsy moth is discussed and demonstrated. This equation incorporates easily measured variables for which values can be found in existing forest inventories. The equation is then applied to a set of sample data available through the Illinois Forest Inventory Data Processing System. Susceptibility predictions for a given area within the state can be obtained from the Illinois Natural Resources Information System at the Illinois Natural History Survey via modem and a local phone line (217-244-1361) or a toll-free number (1-800-247-4647). Survey, Natural Resources Building, 607 Fast Peabody Drive, Champaign, Illinois!) 1820 Before a man use ript is accepted for publication in the Bulletin or in Biological Notes, two or more outside referees must recommend it.
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