棉铃虫雌成虫对16种植物的产卵偏好性及幼虫取食后的生存表现

为研究棉铃虫成虫寄主偏好性和幼虫取食后生存表现之间的关系,明确两者在决定寄主过程中的作用,我们测定了交配后的棉铃虫雌成虫对16种植物(棉花、玉米、大豆、花生、番茄、辣椒、茄子、烟草、黄瓜、胡萝卜、西芹、杨树、月季、菠菜、包菜、大葱)的产卵偏好性和幼虫取食这些植物嫩叶后的存活和发育情况。棉铃虫雌成虫选择在烟草、茄子、棉花、胡萝卜、番茄、辣椒、玉米、西芹、大豆和花生等10种植物上产卵,但只有取食西芹、烟草、番茄、大豆、棉花和胡萝卜等6种植物叶片的初孵幼虫能够完成幼虫阶段的生长发育、化蛹并羽化,且取食植物嫩叶的幼虫的存活率、发育历期、蛹期和蛹重均差于取食人工饲料的幼虫。以上结果表明,棉铃虫雌成虫产卵寄主与其幼虫取食寄主之间存在并非一一对应的关系,幼虫的生存表现限定了棉铃虫的寄主范围。

Oviposition preference of female adults of Helicoverpa armigera to 16 host plants and larval performance

To investigate the relationships between adult host preference and larval performance in Helicoverpa armigera and compare their roles in determining host plant range, we measured the oviposition preference of mated female adults of H. armigera to 16 plants (cotton, corn, soybean, peanut, tomato, pepper, eggplant, tobacco, cucumber, carrot, celery, poplar, Chinese rose, spinach, cabbage, and green onion) and the survival and development of H. armigera larvae fed with young leaves of the 16 plants. The female adults of H. armigera significantly selected tobacco, eggplant, cotton, carrot, tomato, pepper, corn, celery, soybean and peanut for laying eggs, whereas only neonates of H. armigera fed with young leaves of celery, tobacco, tomato, soybean, cotton, or carrot could complete larval development, pupate and emerge into adults. Moreover, the larvae fed with young leaves were inferior to those fed with artificial diets in survivorship, duration of larval stage, duration of pupal stage, and pupal weight. These results indicate an inclusive, rather than one-to-one relationship between adult oviposition and larval feeding, and larval performance ultimately determines the host range of H. armigera.