National has moved its campaign into rural New Zealand as it goes for the regional vote.
It's gunning for Labour over its policy to bring farmers into the Emissions Trading Scheme and says proposed new taxes will hit the regions hard.
Party leader Bill English was speaking to farmers at a meeting in Ashburton on Tuesday, telling them Labour's proposed water tax was punitive and Canterbury was the part of the country that would be most affected by it.
"It's just another big uncertainty and it's aiming at the wrong target - it apparently won't be paid in places where there's no irrigation but where there are still water quality issues," he said.
"There's a good deal of resentment that Labour and the Greens have suddenly discovered water quality.