龟纹瓢虫Propylaea japonica (Thungberg)和异色瓢虫Harmonia_axyridies(Pallas)是棉田捕食棉蚜的优势天敌种类。在自然情况下,其种群密度较大,尤其是其幼虫扩散范围小,能较稳定地抑制蚜虫增长,对控制蚜害起着重要作用。为进一步明确它们与被捕食者之间的关系,更好地利用捕食潜能,我们于1983年至1984年对两种瓢虫幼虫在不同猎物密度下的捕食效应及猎物密度对其生长发育的影响作了初步研究。 Propylaea japonica (Thungberg) and Harmonia axyridies (Pallas) are the predominant predators of cotton aphid in cotton fields. In natural conditions, its population density, especially its larvae spread a small area, can more stable inhibition of aphid growth, plays an important role in the control of aphids. In order to further clarify their relationship with the prey and make better use of the predation potential, we studied the predation effect and the density of prey on the growth and development of two ladybug larvae at different prey densities from 1983 to 1984 Made a preliminary study.