Venus Liquid is an Insect growth regulator (IGR) for the prevention of blowfly strike in sheep. Control of Blowfly Strike for up to 14 weeks. Active Constituent: Cyromazine 500g/L Dose Rates & Administration Instructions: Venus Liquid is a water-soluble suspension for jetting, dipping and dressing. Quick Facts & Benefits: The active ingredient in Venus Liquid is cyromazine. Cyromazine causes retardation, malformation and death of young fly larvae. Venus Liquid has a favourable environmental profile, and is safe for producers and sheep when used according to the label. Venus Liquid does not affect wool quality. Recycle containers via drumMUSTER.