Rat numbers have exploded across New Zealand and it is no different in Rotorua with some saying numbers are at a 48-year high.

Pest controllers' phones are ringing off the hook due to an outbreak caused by a mega mast Forest and Bird say.

A mega mast is an over-abundance of plants that have a high seed production, in turn providing food for pests.

The problem began close to four months ago and there are ways to avoid a problem like this in future said Alpeco managing director Heiko Kaiser.

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"There are more rats and bigger rats because their stomachs

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