iffusion of Bemisia tabaci in early spring in Beijing and Hebei regions
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Key Words： Bemisia tabaci， population dynamics，diffusion of early spring
Abstract： In order to minimize crop damage it is important to control Bemisia tabaci(Gennadius) before its dispersal from greenhouses in early spring. The spring abundance and dispersal of B. tabaci from greenhouse tomato crops in the Beijing and Hebei regions was studied using systematic surveys and inspection. Numbers of this insect in greenhouses first decreased gradually then increased. The results show that the hosts of B. tabaci in greenhouses are tomatoes, melons, cucumbers, beans and wax gourds, and that the peak of dispersal from greenhouses to fields occurred in early and mid-May. The highest numbers of individuals were observed within one meter of greenhouses and density in fields was negatively correlated with the distance to the nearest greenhouse. Therefore, we suggest that the best way to prevent the dispersion of B. tabaci to fields is to control this pest intensively near greenhouses in early and mid-May.