Impact of aerial 1080 baiting with deer-repellent and standard bait on white-tailed deer on Rakiura /Stewart Island
The Bioeconomy Science Institute (BSI) was commissioned by Zero Invasive Predators Ltd to assess the non-target impact of aerial 1080 baiting on white-tailed deer (Odocoileus virginianus) on Rakiura / Stewart Island. The work was undertaken between March and December 2025. Objective To determine and compare the non-target impacts on white-tailed deer of (i) standard Pronature™ Dry Forest 1080 cereal bait and (ii) Prodeer® Possum + Rat deer-repellent 1080 cereal bait when used for pest control on Rakiura / Stewart Island. Methods Two adjacent areas on Rakiura / Stewart Island were aerially treated with toxic bait; one with deer-repellent 1080 bait (8,441 ha) and one with standard 1080 bait (32,089 ha) in August 2025. We also used an adjacent untreated area as an experimental control.
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