Farmers along Yangtze go green - and orange

To protect the ecosystem, farmers living on the banks of the Yangtze River have begun to dramatically reduce the use of chemicals and adopt biological pest control methods.

Orange farmer Ran Xiaoli's orchard of navel oranges on the south bank of the river is a good example.

In addition to insect-trapping balls, solar-powered lamps and sticky cards, a special type of mite has been introduced to kill pests. One of the predatory mites, the size of a sesame seed, can eat an insect, such as a red spider, that's two or three times its size. A bag of 1,500 mites can kill all the pests on a citrus tree.