group of insects other than both insect pests and natural enemies,such as dominantmosquito(adult and larva)and collembola in paddy field,was defined as the neutral insects inthis paper.The regulation effects of the neutral insects on the community food web in paddyfields,as well as direct and indirect relationships among the neutral insects,predators andpests,were studied by using the press and the pulse experiment designs and some selectivecontrol methods with buprofezin to control plant hoppers and with B...