A farmer presents a corn leaf nibbled by an armyworm in Siping County, northeast China's Jilin Province, Aug. 14, 2012. Armyworm plague broke out in some of China's northern areas in early August and has affected more than 2 million hectares (or 20,000 square kilometers) of corn, millet and paddy crops. Due to prevention and controlling efforts, the plague's impact has been limited so far. (Xinhua