Fig. S1. Spatial autocorrelation in male Lymantria dispar trap catch data from 2005, 2006, and 2007, using data from the area in Wisconsin where gypsy moth was considered to be established and along the leading edge of gypsy moth spread where the majority of our sites were located.

Fig. S2. Historical records of Entomophaga maimaiga releases and known recoveries in Wisconsin, locations of Gypchek® (Lymantria dispar nucleopolyhedrovirus) treatment blocks deployed under the Gypsy Moth Slow-the-Spread program, and 2005–2007 study sites.

Fig. S3. Population thresholds used to estimate Lymantria dispar spread rate and the rate at which populations transition from a 10- to a 100-moth threshold.

Table S1. Study sites sampled in southern and central Wisconsin, 2005–2007.

Table S2. Tachinid parasitoid species richness and frequency of occurrence in 182 parasitized Lymantria dispar larvae collected from the leading edge of L.  dispar spread.

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