Population Dynamic of Myzus persicae and Diffusion on Tobacco Plants in Longxian County

To be clear about the population of tobacco aphid in Longxian county,search the best method of field management.Through the survey and the data processing,we can conclude that: ① The tobacco aphid in Longxian county in all tobacco growing period.Winged aphid persists in the lower state,that showed that Myzus persicae in the field of infection and multi-lateral sources.② Myzus persicae is under the control of district characteristics in the complex tobacco field in addition to the distribution of a species.it also affected by the natural environment of tobacco fields,in particular a greater impact on wind direction;field management level and timeliness of management of change can affect the tobacco aphid,too.③ The result that the dynamic which same habitat and different habits have the same gathered diffusion pattern and the aphid number of per plant changed with growing of the tobacco shows that the internal mechanism of the preservation of aphid population is affection among the individual,that shows the environment vulnerable survivors survival development and expansion of ecological measures.④The aphid number of the top two leaves of significant positive correlate with the whole plant aphid can be in practice aphid its total volume of the whole plant as a basis for aphid control volume indicators.⑤ The aphid numbers of five species tobacco indicate that 9717 has the most effective anti-aphid,Qinyan 96 as the second,both of the two can be used with the choice of plant match.