Additional pressure stemmed from risk aversion after top US Republican lawmaker John Boehner said there had been no substantive progress in the last two weeks in talks to reach a budget deal that would avert a possible recession next year.

As of 12:02 p.m. CST (1802 GMT), CBOT December wheat was down 8 cents at $8.68 per bushel, on track for its first daily loss after rising for seven straight sessions. March corn fell 5 cents to $7.59 a bushel and January soybeans were down 3/4 cent at $14.45-1/2 per bushel.