Taliban leaders, seeking international acceptance after seizing power in Afghanistan, have told farmers to stop cultivating opium poppies, residents of some major poppy-growing areas say. This has caused raw opium prices to soar across the country.

In recent days, Taliban representatives began telling gatherings of villagers in the southern province of Kandahar, one of the country’s main opium-producing regions, that the crop—a crucial part of the local economy—would now be banned.