By offering food , other help to encourage Afghan farmers to grow wheat . By trying to wean Afghan ##s from poppy production . Poppy is used to produce opium and heroin . Historically , heroin has been a major source of revenue for the Taliban .
USAID offering seeds , other help to encourage Afghan farmers to grow wheat . Agency trying to wean Afghan farmers from poppy production . Poppy plants used to produce opium and heroin . Opium , heroin has been a major source of revenue for the Taliban .