Wheat prices fell thanks to timely rains in the southern U.S. Great Plains, which will aid winter wheat growth as it nears dormancy in key wheat growing regions like Oklahoma, Texas and Kansas. Analysts said lackluster demand for U.S. supplies of the grain also weighed on prices, with traders looking ahead to increased competition from Russia, another major wheat producer, where the ruble is falling against the U.S. dollar, making it more competitive on the global market.