This map depicts the range of infestation and defoliation due to Forest Tent Caterpillar [Malacosoma disstria (Hubner) Lepidoptera: Lasiocampidae] in Minnesota over time.  Data are from Minnesota Department of Natural Resources.  (Maps translated from Eppl7 format to Arc/Info coverages by Brad Conway,  animation by Thor Sawin, MSU Department of Forestry.)