G.D.G. Aviation Inc. is a Quebec firm specializing in the control of biting insects using Bacillus thuringiensis serotype israelensis (BTI) which is a naturally occurring larvicide which is toxic to mosquitos and black fly larvae. G.D.G. uses ground crews, fixed-wing aircraft and helicopters to drop BTI in wetlands. In April 2016, GDG had two Bells and two Cessna 188s at Mascouche Airport (CSK3) working north of Montreal. C-GZBN was imported by Estevan Air Svcs in SK in 1979 and later flew with Western Ag-Air in SK and Valley Ag Air in MB before sold to G.D.G. Aviation in Quebec in Aug. 2003.