Rewrites throughout with U.S. session trading, adds quote, updates prices, changes byline, changes dateline from SINGAPORE/PARIS

By Karl Plume

CHICAGO, June 1 (Reuters) - U.S. corn futures fell to fresh multi-week lows on Monday as favourable U.S. crop weather and rising global supplies, along with technical pressure, sparked fund selling.

Soybeans also eased on strong U.S. crop prospects and good world supplies, and as demand from top importer China remained elusive. Wheat futures slipped to near one-month lows on big global supplies.

Grains were generally weak despite rallying crude oil prices amid renewed fighting in the Middle East that raised doubts over U.S. peace talks with Iran. O/R

Grain markets have mirrored fluctuations in crude oil during the three-month-old U.S.-Israeli conflict with Iran, partly reflecting the use of crops in biofuels. But favorable crop weather and tepid demand in the United States, and strong harvest prospects in South America, have increasingly weighed on corn and soy.

"The weather is the dominant issue, and the fact that the (U.S.) producer has large old-crop stocks that you have to move before new-crop," said Don Roose, president of U.S. Commodities.

The U.S. Department of Agriculture is due to release its first weekly crop condition ratings for corn and soybeans later on Monday. Analysts expect the agency to rate up to 70% of the crops in good-to-excellent condition.

Drier weather in the U.S. Midwest has eased concern about planting delays, while rain in the U.S. Plains has tempered drought fears.

A rally in wheat supported by drought damage to U.S. winter crops has faded because of favourable harvest prospects elsewhere in the Northern Hemisphere and uncompetitive U.S. export prices.

Chicago Board of Trade July corn CN26 was down 5-3/4 cents at $4.41 a bushel at 11:53 a.m. CDT (1653 GMT) after hitting overhead technical resistance at its 100-day moving average and touching the lowest point since April 13 on a continuous Cv1 chart. July soybeans SN26 were down 8-3/4 cents at $11.78 a bushel and CBOT July wheat was down 2-1/2 cents at $6.08 a bushel.