棉铃虫营养生态学的研究:食物中糖含量的影响

用人工饲料研究了食物中不同含糖量对棉铃虫Heliothis armigera(Hfibner)生长、发育和繁殖的影响.基础饲料含粗蛋白质9.7%.饲料含糖12.5%对棉铃虫有最佳的营养效应.糖对蛋白质的比率在1.0—2.0对棉铃虫种群生长比较适宜.含糖量低于10%导致蛹的脂肪含量下降、成虫寿命缩短、产卵量显著减少.饲料含糖量超过28%使幼虫取食速率降低、代谢负担加重、发育历期延长、成虫繁殖力下降.因此,棉铃虫正常发育和繁殖所需的饲料碳水化合物含量应高于其蛋白质含量.这些结果与棉铃虫的食性特点是一致的.

NUTRITIONAL ECOLOGY OF THE COTTON BOLLWORM, HELIOTHIS ARMJGERA (HUBNER): EFFECTS OF DIETARY SUGAR CONCENTRATION ON DEVELOPMENT AND REPRODUCTION

Performances of development and reproduction of the cotton bollworm, Heliothis armi-gera (Hubner), reared on artificial diets with sugar concentration ranging between 8.6% and 35.8% were examined. The basic diet contained 9.7% gross protein. Higher indices of develop-menrreprocluction of the insert were obtained when the carbohydrate: protein ratio in the diet varied from 1.0 to 2.0, with the best effect at about 1.3. Less than 10% sugar in the diet resulted in lower lipid content in the pupae, shorter life-span of the female moths, and therefore, significantly poorer fecundity, with no marked influence on larval development. On the other hand, above 28% dietary sugar concentration would cause metabolic stress manifested in prolonged developmental period and decrease in fecundity. The results of the experiments imply that H. armigera requires a diet containing more carbohydrate than protein for better performance and this is in agreement with the feeding behaviour of this species observed in the field.