Already, a third of the country’s wheat production lies outside the government’s control, according to officials from the U.N. Food and Agriculture Organization. (Syrians who work in the agriculture sector believe that the number is probably higher.) The Islamic State holds the biggest chunk, including much of the country’s breadbasket, the prime wheat-producing lands that Syrians call the Jazira. It practices the same strategy in Iraq, where the FAO estimated last year that it controlled some 40 percent of all wheat production.
bth: this is an excellent article on wheat and Syria. Wheat like diesel is used to control the local populations.