Journal of Economic Entomology (1998) 91, 464-472

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Andrew M. Liebhold, Eugene Luzader, Richard Reardon, Andrew Roberts, F. William Ravlin, Alexei Sharov and Guofa Zhou (1998)
Forecasting gypsy moth (Lepidoptera: Lymantriidae) defoliation with a geographical information system
Journal of Economic Entomology 91 (2), 464-472
Abstract: Maps of defoliation caused by the gypsy moth, Lymantria dispar (L.), as well as point estimates of egg mass density and counts of male moths captured in pheromone-baited traps collected from the Shenandoah National Park and George Washington National Forest from 1989-1992 were assembled in a geographic information system. A maximum likelihood estimation procedure was used to fit 15 logistic regression models that predicted the probability of noticeable defoliation in 1-ha grid cells from various combinations of egg mass densities, counts of males in pheromone traps, presence of defoliation in the previous year, and distance to the expanding gypsy moth population front. Models that incorporated egg mass density estimates and distance to the infested front provided the most reliable predictions of defoliation probability. The performance of these models was comparable with decision errors encountered using various egg mass density thresholds alone. The errors associated with application of egg mass density thresholds and the various models were high and highlighted the need for improved methods for predicting defoliation.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Andrew M. Liebhold, Alexei A. Sharov

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
population dynamics/ epidemiology


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Lymantria dispar U.S.A. (NE)