OTTAWA, April 23 (Reuters) - Canada's Competition Bureau

on Tuesday said it had identified major competition concerns

around the proposed merger between U.S. grains merchant Bunge

and Glencore ( GLCNF )-backed Viterra.

In a statement, the bureau said the deal was "likely to

result in substantial anti-competitive effects and a significant

loss of rivalry between Viterra and Bunge in agricultural

markets in Canada".

The report was sent to Canada's transport ministry, which

has until June 2 this year to review the deal.