中文摘要：

在昆虫中，雄虫先于雌虫羽化，称为雄虫先熟现象，而雌虫先于雄虫羽化，称为雌虫先熟现象。前者最为普遍，后者报道较少。本试验在20、22和25℃下对棉铃虫Helicoverpa armigera（Hilbner）的生长发育进行了详细的研究。结果显示发育历期随温度的升高而缩短，雌雄间发育历期有着显著的差异，各个温度下雌虫均比雄虫先羽化，表明棉铃虫属于雌性先熟种类，而这种差异主要是由于雌虫的蛹期较短所致。幼虫发育历期与蛹重呈显著的正相关性。

英文摘要：

Insects in which males emerge before females are protandrous whereas those in which females emerge before males are protogynous. The former are common but the latter are rare. The growth and development of the cotton bollworm, Helicoverpa aimigera（Htibner） , was systematically investigated at 20, 22 and 25~C. The results indicate that development time gradually shortened with increasing temperature and differed significantly between females and males. Females were protogynous; emerging before males at all three temperatures. Their earlier emergence was due to a shorter pupal duration. Pupal weight was positively correlated with the duration of larval development.