After WNS [white-nose syndrome] detection, insecticide use was about 1 kg/km2 higher in the WNS-confirmed counties compared with the non-WNS counties, relative to the year before WNS detection. After more than 5 years from initial exposure, insecticide use was, on average, more than 2 kg/km2 higher. These results reflect substantial increases, above 25%
The paper, if anyone wants to read it