CHICAGO, Aug 29 (Reuters) - Chicago Board of Trade corn futures firmed on Friday on support from strong international demand, concerns over disease in the U.S. Midwest and technical support, analysts said.
Corn has been underpinned by brisk exports, concerns over Tar Spot and Southern Rust in the U.S. corn belt and technical support.
Ethanol producer Inpasa and Brazilian grain processor and exporter Amaggi have agreed to form a joint venture to build at least three corn-based ethanol plants in Mato Grosso, Brazil's top grain producing state, the firms said on Friday.
U.S. weekly corn export sales reported on Thursday topped 2 million metric tons for the second week in a row.
Traders were adjusting positions at the end of the month and before a long weekend in the United States, where financial markets will be closed on Monday for the Labor Day holiday.
CBOT December corn futures CZ25 ended 10-1/4 cents higher at $4.20-1/4 per bushel.