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But as the two countries work on a trade deal, experts say Washington now wants to push "big-ticket" farm exports - wheat, cotton, corn and maize - to narrow its $45bn trade deficit with India.

“There’s a disturbing level of contamination of native maize with genetically modified traits,” said Timothy Wise, a researcher at the Global Development and Environment Institute at Tufts University.

He is bringing with him desperately needed food - maize meal, peanuts and beans - for his family who are already at a makeshift camp set up in the town's football stadium.

"Beavers can flood and waterlog fields, feed on agricultural crops like maize, as well as damage and fell trees such as cricket bat willow."

Dozens of cranes have in recent years been found dead after they were poisoned by rice and maize farmers in Lwengo district, in south-central Uganda.