In 1984—1988,the population dynamics of main natural enemies in citrus orchards in Hunan Province,namely,Amblyseius nicholsi,Stetho- rus punctillum,Scolothrips takahashi,Chrysopa sinica,and Propylaeo japoni- ca were investigated,and their functional responses to citrus red mite Panonychus citri were tested.In these predators,A.nicholsi was the dominant species with maximum density,and was closely related to the number of mite host.All the tracks of their functional responses be- longed to Holling′sⅡ equation.The feeding amount of C.sinica wa...