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Gypsy Moth Development


The gypsy moth phenology information accessed through the calculator below is generated with the GMPHEN model authored by Katherine A. Sheehan with the U.S. Dept. of Agriculture, Forest Service, using weather data gathered by the WI-MN Cooperative Extension.

GMPHEN is a computer model that uses daily temperature and previously published data to predict the timing for gypsy moth and host development. This model simulates gypsy moth (Lymantria dispar) egg hatch, larval and pupal development, and budbreak and leaf expansion for six eastern hardwoods. GMPHEN reports the percentage of gypsy moths in each life stage, mean life stage, mean percent leaf expansion, and for each host species, percent budbreak and leaf expansion.

To use this model, select the county of interest and enter the approximate percentage of each of the six tree species in the area. After the model runs, you can choose to view the data as a color or black and white plot, or in a numerical table.

More information about GMPHEN and gypsy moth phenology.

Gypsy Moth Phenology Calculator

Select county:
Tree Species Composition:
White Oak: %
Red Oak: %
Black Oak: %
Red Maple: %
Sugar Maple: %
American Beech: %
Access expanded input list for GMPHEN model

If you have questions regarding the use of this
gypsy moth prediction model, please contact