The council refused permission on the grounds that the track at Penlon, Anglesey, had not been in constant use for ten years.

Nearby residents had had formed a committee called The White Lodge Group and complained that the motorbikes were too noisy.

A White Lodge spokesman said: "The 50+ local residents whom were opposed to the track are very happy to learn that after a lengthy campaign that we have done our part in safeguarding this outstanding AONB area and its surroundings for future generations," he said, adding, "Perhaps now a more suitable site can be found for this activity".

But Gerry Davies who runs the track had already restricted the opening times to ten hours a week spread out over two days.

He and landowner Iolo Owen blasted the campaigners for misleading planning officials, including the claim that the site has SSSI status.

"It's unfortunate but I hope that they can think of something for these young people to do and can channel their thoughts into something more constructive,"said Mr Owen.

Henry Williams, whose 15-year-old son Dyfed used the track regularly, said he was concerned teenagers would be forced to ride illegally.

Former Welsh and British off-road champion Wyn Hughes was at the track last weekend and says he has recommended the Penlon track for new riders for over ten years.

He teaches young riders and disagreed with residents' claims that the track had not been used.

"I was one of the first people to ride on this track and that was fifteen years ago," said Mr Hughes, who lives in Llanidloes.

A spokesman for Anglesey planning department said: "We have dealt with an application for a certificate for lawful use of a practice area for the off-road riding of motorbikes for a maximum of 10 motorbikes for two five-hour sessions per week, and for parking of vehicles in connection with that use.

"Based on information and evidence provided, on the balance of probability, the use specified has not been proven to be lawful and therefore the Local Planning Authority considered that use as unlawful.

"It is open to the Authority to enforce against a breach of planning control if it transpires that the use of the land still persists following the council's decision.