Crop dusting airplanes began flying over Honey Creek Park in the early morning hours of May 21, spraying 220 acres of city property with Bacillus thuringiensis var. kurstaki (Btk) to kill caterpillars of the invasive gypsy moth species.

The chemical Btk, which is dropped from a crop dusting plane, is not toxic to humans, pets, animals or bees.

The project is a part of the Wisconsin Department of Agriculture, Trade and Consumer Protection to rid the area of invasive insects.