Up to 300 bee hives are thought to have been poisoned in the Far North as soaring numbers of beekeepers chasing "liquid gold" - manuka honey - ratchet up tensions in the industry.
Owner David Yanke is convinced deliberate poisoning caused the death of millions of bees but is waiting for test results from the Ministry of Primary Industries for confirmation.
Mr Yanke said he discovered hundreds of hives half full of dead bees during Easter. The surviving bees were "boiling out of the hives" and falling to the ground, unable to fly.
The suspected poisoning occurred during Easter in Paranui Valley, inland from Taipa in Doubtless Bay, where Mr Yanke has been breeding queen bees for the past 30 years. He runs Daykel Apiaries with his partner Rachel Kearney.
He alerted the Ministry of Primary Industries (MPI) immediately, in case the deaths were caused by a new pest, but the scale and suddenness - and the way the affected hives radiated from a central point - meant poisoning was the only plausible explanation.