Mike Cron wants rugby to follow the league system of putting players on report for indiscretions rather than sending them to the sin bin for 10 minutes.

All Blacks assistant coach Mike Cron is concerned the trial of six-point tries in rugby will lead to an increase in yellow cards which "bugger the game".

New Zealand Rugby announced the national provincial championship would join a series of competitions world-wide in trialling the new scoring system, along with new rules around the breakdown, late last year.

Under the new scoring system, tries will be worth six points and penalties two points, but dropped goals will remain three points.

Speaking at the New Zealand Rugby-run rugby development officer conference at the Sport and Rugby Institute in Palmerston North, Cron was not convinced the more valuable tries will have the attacking benefits they were hoped to.

READ MORE: Blackadder blindsided by bonus

"The six-point try, I am iffy on that," he said. "Because then you are going to get a lot more penalties to stop a try. The next thing is there is going to be more yellow cards."

He believed rugby needs to consider taking a leaf out of league's book by putting players on report rather than sending them from the field for their indiscretions.

"Yellow cards piss me off, I think it should be like league," he said. "[Yellow cards] bugger a game."

But he said they were heading along the right lines with the new breakdown laws.

Under the new trial laws, rucks will be referred to as breakdowns and will be considered formed as soon as the first attacking player is over the ball.

Once the breakdown is formed, no one can play the ball with their hands. Players are also able to enter the ruck from any angle as long as they are onside.

The rights of the tackler have also been reduced.

It is hoped defences will be more inclined to counter-ruck in numbers.

Cron said the jury was still out on the breakdown rules.

"It will be interesting if it brings more forwards into the pot," he said. "In which case, there is going to be more forwards congregating around which gives more space out wide."

"But any action has a reaction, so it is just going to be interesting over this next period to see how it ends up.

"It won't be the finished product, I don't think. But at least we are trying."

While the new rules will not be introduced to the international arena yet, Cron was confident the All Blacks would be ready if it happened.

"We never stand still. We are are always looking for what is next and we try and stay ahead of our opposition.

"We have managed to just keep our noses in front of identifying how the game is going. I think that we have re-acted a lot quicker than some other teams."