| Whitefly( Bemicia tabaci) is an important pest. Because of different host plant range, reproductive ability and invasive ability, this species would be separated many different biological-types. Among these biological-types, the impact of B-type is most serious. By the end of 1980s, Whitefly had already expended to every agricultural area in the world. Nowadays, Bemicia tabaci has became one of the most harmful insect entirely. Researcher presented some reports about whitefly after 1980s. We have to face the serious condition that made by whitefly in many province of China mainland now. The impact of whitefly has brought us deep risks for nearly billions RMB.To control this harmful species in our country, people has facilitated control tools in many ways, such as chemical pestcide and Fungi. With the development of "Green Agriculture" in our country, biological control agents hasplayed an important role. Whatever native nature enemy or nature enemy imported from oversea, they were very useful to whitefly. O.sauteri, E.formosa and C.pallens are common nature enemy of B. tabaci in green house. The influence of these three species in guild is significant.This article is about the study of the functional response and behavior observational analysis of prey or parasitizing in these three biological control agent: Orius sauteri, Intarsia Formosa and Chrisom pollens to whitefly Bemicia tabaci. Secondly, compare different stages of prey or parasitizing in above three species to whitefly, and find out discrepancy.The results of the experiments:The functional model of predation in O. sauteri to different stages of B. tabaci as below: ①To eggs of whitefly, the formula of Holling model is Na=0.8292N / (1+0.00647N), and sudden attack rate "a"' is 0.8292, threatment time range "Th" is 0.00647, daily max quantity of prey "maxNa" is 128.1; ②To nymph of whitefly, the formula of Holling model is Na=0.5203N / (1+0.006389N), and sudden attack rate "a'" is 0.5203, threatment time range "Th" is 0.006389, daily max quantity of prey "Namax" is 81.4; ③To pupae of whitefly, the formula of Holling model is Na=0.5176N / (1+0.010545N), and sudden attack rate "a'" is 0.5176, threatment time range "Th" is 0.010545, daily max quantity of prey "Na(max)" is 49.1.The functional model of predation in C. pollens to different stages of B. tabaci as below: ①To eggs of whitefly, the formula of Holling model is Na=0.5173N / (1+0.002608N), and sudden attack rate "a'" is 0.5173, threatment time range "Th" is 0.002608, daily max quantity of prey "Namax" is 198.4; ②To nymph of whitefly, the formula of Holling model is Na=0.1911N / (1+0.002156N), and sudden attack rate "a'" is 0.1911, threatment time range "Th" is 0.002156, daily max quantity of prey "Namax" is 88.6; ③ To pupae of whitefly, the formula of Holling model is Na=0.3702N / (1+0.00337N), and sudden attack rate "a'" is 0.3702, threatment time range "Th" is 0.00337, daily max quantity of prey "Namax" is 109.9;E.formosa did not like to hunt or parasitize eggs of whitefly. During the observation of behavior of E. Formosa, search time ratio is 52%, and next is rest, account for 22%。 The time of hunt for nymph and pupae in this species is longer than the time of...
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