Abstract
Does forest land subject to intensive outbreaks of gypsy moth (Lymantria dispar L.) become less susceptible to defoliation? A model for estimating the likelihood of gypsy moth defoliation has been developed and validated. It was applied to forest-inventory plot data to quantify trends in the susceptibility of forest land in south-central Pennsylvania during a period of intensive infestation. Results show that even though susceptibility of the region's forest apparently has deciined, the potential for future infestations remains relatively high.
Keywords
Forest health,
defoliation,
susceptibility,
hazard classification,
Lymantria dispar L.
Citation
Gansner, David A.; Quimby, John W.; King, Susan L.; Arner, Stanford L.; Drake, David A. 1994. Tracking changes in the susceptibility of forest land infested with gypsy moth. Res. Pap. NE-690. Radnor, PA: US. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 4 p.