May 29 (Bloomberg) -- Cotton futures fell, extending the longest slump since June, on speculation that slowing growth in China will curb demand.

The International Monetary Fund lowered its forecasts for growth in China, the worldΆs biggest user of the fiber, to about 7.75 percent this year and next. In April, the IMF projected growth of 8 percent this year and 8.2 percent in 2014. Through May 26, 59 percent of the U.S. cotton crop was planted, up from 39 percent a week earlier, the government said in a report yesterday. Sowing is about 17 percentage points behind last year.

“People are thinking weΆre going to get this crop off to a reasonably decent start, after this horrible start we got off to earlier in the year,” Jack Scoville, a vice president at Price Futures Group in Chicago, said in a telephone interview. “WeΆve got some demand questions,” he said, citing China.

Cotton for July delivery fell 0.9 percent to settle at 80.7 cents a pound at 2:30 p.m. on ICE Futures U.S. in New York. The price declined for the seventh consecutive session, marking the longest slump since June 5.