不同食料植物对棉铃虫生长发育和繁殖的影响

报道了棉花、烟草、番茄和辣椒4种植物对棉铃虫Helicoverpa armigera生长发育和繁殖的影响。棉铃虫成虫喜欢在番茄上产卵，在辣椒上的着卵量最少。初孵幼虫喜选食嫩棉叶，选食辣椒嫩叶的虫数最少。4组幼虫取食嫩叶时的平均相对生长速率都有显著差异，顺序为棉叶组>烟叶组>番茄叶组>辣椒叶组。幼虫存活率以取食棉花时最高，取食番茄时最低。棉花组成虫的产卵量最高，烟草组的产卵量最低。取食棉花的棉铃虫种群增长的速度约为取食番茄时的14倍。6龄幼虫能有效利用和转化棉铃、烟草蒴果、辣椒果实，而对番茄果实的利用和转化效率较低。棉铃虫可分别以这4种植物的不同器官为食完成世代循环。其中，棉花是最适宜的寄主，辣椒和番茄是较不适宜的寄主。

Performances of the cotton bollworm, Helicoverpa armigera on different food plants

Development，survival and reproduction of the cotton bollworm, Helicoverpa armigera (Hübner), reared on cotton，tobacco，tomato and hot pepper plants were monitored at (27.0±1.0)℃ with a 14L∶10D photoperiod in the laboratory. It was showed in the choice trials that the adults preferred ovipositing on the potted tomato plants while the newly hatched larvae liked staying and feeding on young cotton leaves which supported their growth better than the counterparts of the three other plants. The early sixth-instar larvae could utilize cotton boll and the reproductive organs of tobacco and hot pepper more effectively than tomato fruits.The larval survival rate was up to 83.6% on cotton as compared with only 7.3% on tomato. However, the durations of the larvae on cotton and tomato were almost the same and those on the two other plants significantly prolongated. The female moths from the larvae on cotton had the greatest egg production while fecundity of the moths from those on tobacco was very poor. The population trend index of this species on cotton was around 14 times that on tomato, the poorest food plant. Since H. armigera completed their life cycle when reared on the four food plants, all of them should be its host plants although tomato and hot pepper are less suitable.