The takeoff behavior of Laodelphax striatellus and its relation to the ovarian development
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Key Words：Laodelphax striatellus, takeoff behavior, ovarian development
Abstract：The takeoff behavior of Laodelphax striatellus（Fallén） and its ralation to factors like the density of macropterous form, wheather, intensity of light and ovarian development were studied by means of field observation, cage experiment and ovary dissection in Hanjiang borough of Yangzhou city from the early July to the late september on 2005. The results show that Laodelphax striatellus（Fallén）are mostly take off after the sunset, and there are a certain threshold density and a optimum lux range for the takeoff. It also shows the oogenesis-flight syndrome to a certain extent.