Shanghai City Agricultural Technology Extension Service Center responsible person, they use "four induced a net and biological pesticide in the pilot field (first pesticide extraction made from plants and microorganisms) to control the pest, the insecticidal methods do not work under the condition that the only appropriate use of chemical pesticides. Two out of 15 acres of vegetable cooperatives were completely without the use of chemical pesticides. According to farmers, price and non pilot pilot vegetable dish vegetable feather is basically the same, the current market price in the 3-4 yuan a pound.