From June to July this year, corn and wheat prices each rose by 25% while soybean prices increased by 17%, the World Bank said. Only rice prices decreased - by 4%.
In the United States, the most severe, widespread drought in half a century has wreaked havoc on the corn and soybean crops while in Russia, Ukraine and Kazakhstan, wheat crops have been badly damaged.
The World Bank said that the use of corn to produce ethanol biofuel - which represents 40% of US corn production - was also a key factor in the sharp rise in the US maize price.
Overall, the World Bank's Food Price Index - which tracks the price of internationally traded food commodities - was six percent higher than in July of last year, and one percent over its previous peak, in February 2011.