India, the world’s second largest producer of wheat, has banned all exports with immediate effect after a heatwave affected the crop. A notice in the government gazette by the directorate of foreign trade, dated Friday, said a rise in global prices for wheat was threatening the food security of India and neighboring and vulnerable countries. A key aim is to control rising domestic prices. Global wheat prices have increased by more than 40% since the beginning of the year. Before the war, Ukraine and Russia accounted for a third of global wheat and barley exports. Since Russia’s 24 February invasion,...