The US, France and Mexico are planning talks to consider whether an emergency meeting is needed to tackle the soaring price of grain.
The three will hold a conference call at the end of this month after the worst US drought in 50 years threatens to cause a sharp rise in the cost of staple crops.
The call will decide whether to convene the first meeting of the newly-formed G20 Rapid Response Forum.
It was formed to promote united action.
A French agriculture ministry official said: "If the situation requires it, a meeting of the Rapid Response Forum could be called as soon as the start of September.
"The aim is to talk about the situation and avoid measures like export embargoes which would be damaging for everyone."
On Friday, the price of benchmark Chicago corn reached an all-time high after the US Department of Agriculture cut its production estimate by
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