人工饲料对黑点切叶野螟生长发育和繁殖的影响

Effects of Different Artificial Diets on Development and Reproduction of Herpetogramma basalis

为了解决黑点切叶野螟(Herpetogramma basalis)自然饲料季节性短缺问题,设计了3种人工饲料配方,以自然寄主空心莲子草(Alternanthera philoxeroides)为对照,在室内研究了人工饲料对生防昆虫黑点切叶野螟生长发育和繁殖的影响。结果表明,黑点切叶野螟在人工饲料饲养下可以完成生活史,但大多数生长发育指标和繁殖指标受到影响。其中,3种配方的人工饲料饲养的幼虫历期均有所延长、羽化率降低、成虫寿命缩短、单雌产卵量降低;配方Ⅰ和Ⅱ饲养的幼虫存活率明显降低,蛹期延长;配方Ⅰ饲养的昆虫蛹重和下一代卵孵化率明显低于对照;化蛹率和雌雄性比未受影响。3种饲料配方中,配方Ⅲ在本试验中表现最优,应在此基础上继续优化配方,以保证在冬季自然饲料短缺时作替代饲料。

To solve the seasonal shortage of natural diet of biocontrol insect,the development and reproduction of Herpetogramma basalis on artificial diets were studied under laboratory conditions,compared with the natural diet Alternanthera philoxeroides,the most important host plant of biocontrol insect H.basalis.The results indicated that H.basalis could be successfully reared on all three artificial diets.But most developmental and reproductive index showed significant differences among artificial diets and natural diets.Under the three artificial diets,the larval duration was prolonged,the emergence rate decreased,the adult life shortened,and the female fecundity decreased.Under artificial dietsⅠandⅡ,the survival rate of larvae decreased and the pupal stage prolonged obviously.The pupal weight and hatching rate were significantly decreased under dietⅠ.The pupation rate and sex ratio had no significant difference compared with the control.In summary,artificial dietⅢwas the best one in this study and it should be optimized in subsequent studies to ensure that more suitable artificial diet could be provided during the natural feed shortage period of the biocontrol insect.