>>5008355 (lb)
Gypsy moths, Fall Cankerworms are invasive species. Somehow they correlate with humans, pathogens and the white-nose syndrome of bats.
"The town successfully completed an aerial spray application of the biological treatment Bacillus thuringiensis Kurstaki (BtK) in the spring of 2018 to control gypsy moth and cankerworm infestation in town woodlands."
https://www.oakville.ca/residents/invasivespecies.html