"When we kicked things off, practically all of the clubs seemed to think it was the best thing out for the district's young talent to play against their own age group but some of them have obviously had a change of heart, and that's very disappointing," Dahlberg said.
"They don't seem to worry that a lot of these guys are not yet physically ready to play in adult competition, they are putting their own interests ahead of that of the players, and Wairarapa-Bush rugby in general."
Dahlberg is hopeful that by making Ruamahanga's plight public, the clubs involved will have another change of heart and encourage them to return to the fold.
"Right now there are no guarantees we will have enough numbers to front up on Saturday, or further down the track either," he said.
For any prospective players, Ruamahanga trains at the Marist No 2 grounds at Memorial Park on Monday and Wednesday evenings.
On the local club front, the clash between two of the unbeaten sides, Carterton and Pioneer, promises to be the highlight of premier division action on Saturday.
Carterton will have home advantage in what could well be a battle of contrasting tactics - Carterton looking to keep the ball close to their forwards and Pioneer wanting to play a more expansive style.