Abstract
Assessment of six types of toxic bait in replicated field trials demonstrated that baits containing 0.15% 1080 were the most costeffective for initial control of possum populations. Possums surviving an initial exposure to either 1080, cyanide, or cholecalciferol baits would not eat lethal amounts of bait containing another fast-acting toxicant during the following 2.5 months. However, ‘shyness’ to 1080 or cholecalciferol baits in possums surviving initial control was overcome by using a slowacting anticoagulant poison during maintenance control. Sustained control of possums is currently most cost-effective if baits containing 0.15% 1080 are followed at least 2 months later by baits containing 0.002% brodifacoum. Unlicenced operators can similarly achieve sustained control of possums at very low densities by using brodifacoum baits 2 months after initial control is undertaken with baits containing cholecalciferol.
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