BONN, West Germany (AP) _ Leaders of the anti-establishment Greens party want to disband their West Berlin branch because some members allegedly support neo-Nazi causes.

A statement issued Monday by Greens' headquarters in Bonn said a vote to expel the West Berlin branch, which has 150 members, would be taken at a national meeting Jan. 26-27 in Freiburg.

Party leaders said that, in the meantime, they were withdrawing their support from the West Berlin branch and would not support West Berlin Greens running in city elections March 10.

The statement said at least four Greens had ties to neo-Nazi groups that allegedly promote fascist ideas and the use of force. The statement did not identify the four.

Hubert Bjarsch, the Greens' leader in West Berlin, rejected the accusations. Claims that the West Berlin branch has been influenced by neo- Nazi ideas ''have no basis,'' Bjarsch told reporters in West Berlin.

Candidates campaigning in two West Berlin districts would go ahead with plans to run in the city elections, he said.

Public opinion polls indicate about 10 percent of the West German voters support the Greens. The movement advocates ideas such as West Germany's withdrawal from NATO, and banning automobiles and other polluting agents.