Grower Leaderbrand, which supplies the big supermarkets, saw significant crop losses and is warning of a supply shortage.
Chair of the Pharmacy Council has apologised to the family of a Hawke's Bay baby who was given the wrong medication and became very sick, but added, "unfortunately human error does happen".
In a statement police say: "Residents can expect to see a continued police presence in the Karamu Road and Pattison Road area tonight".
The incident, that was caught on camera, took place in the lunch room of a Turners and Growers pack house in Whakatu, near Hastings, in July 2015.
The public letter released by Ngati Kahungunu iwi comes as Craggy Range released options to fix the Hawke's Bay track.