The public in Wairoa are being warned not to touch rook bait which was lost in the area.
The 10 sealed gel tubes were lost from a helicopter while Hawke's Bay Regional Council was undertaking rook control.
The bag containing the bait, along with jerry cans and some personal items, was attached to the bottom of the helicopter when it was lost.
Searches have been undertaken along the helicopter's flight path, both by air and on foot, primarily farmland, forestry and conservation land.
Landowners in the area, police, Ministry of Health, Hawke's Bay District Health Board, Department of Conservation (DoC) and the Civil Aviation Authority have been informed.