Global food prices ticked up in July to the highest in more than three years as renewed concerns over key grain export corridors compounded adverse weather across major growing regions. The United Nations’ index of food-commodity prices rose 0.6% in July from the previous month, led by grain, sugar and vegetable oils, according to a report from the Food and Agriculture Organisation Friday. ADVERTISEMENT CONTINUE READING BELOWIntensifying Russian and Ukrainian attacks are fuelling fears over supplies from the key Black Sea grain region, helping to push wheat prices to a two-year high in July. Global wheat prices jumped 5.8% in July, bringing their gains to almost 10% from a year ago. The outlook for an unusually powerful El Niño, on top of fertiliser disruptions and elevated energy costs in the wake of the Iran conflict, means global food markets are confronting a fresh wave of production and trade risks.