Pyranha Insecticide Aerosol - 15 oz. Can. Pyranha Insecticide Aerosol: Is an equine aerosol that has been on the market for over 15 years. This product is citronella scented. Brushing the animal after an application will bring out a bright, lustrous sheen. Pyranha Aerosol has been used by champions all over the country for maximum fly control just before entering the show ring.