Chinese environmental authorities have released 600 million bees to combat a plague of American white moth has affected large areas of farmland and forests in northern China, reported the official Xinhua news agency. The bees have been released near the city of Baoding, near Beijing, after detection of a pest moth has infested 20,000 hectares of crops, said those responsible for forest control of epidemics in the province of Hebei, where the locality is .