甜菜夜蛾生殖能力与蛹重、饲料之间的关系

THE EFFECTS OF DIET QUALITIES ON PUPAL WEIGHTS AND FECUNDITIES OF BEET ARMYWORM

以大豆、小麦、酵母粉为主要原料配成的人工饲料饲养甜菜夜蛾,平均单头蛹重为97.97±1.76mg,范围为48～141mg;天然饲料饲养的为88.15±2.49mg,范围为34～133mg。将蛹重分为单头130mg以上、120～129、110～119、100～109、90～99、80～89和80mg以下等7个级别。人工饲料的主要分布在90～110mg之间,占48.44％;天然饲料的主要分布在80～100mg之间,占51.62％。各雌蛹重量级别(人工饲料,第3代)怀卵量分别为:1050±358、876±280、876±192、971±110、921±117、764±156和613±133粒,天然饲料的为496±179粒。结果表明,卵量与雌蛹重基本呈正相关,其生殖能力最强的雌蛹重在80～110mg之间。

The average and range of pupal weight of beet armyworm Spodoptera exigua (Hubner) fed on artificial diet mainly consisted of soybean,wheat and yeast were 97. 67 ±1. 76 and 48-141 mg,while those on natural diet,the amaranth plant,were 88. 15± 2. 49 and 34 - 133 mg. As the pupal weights were divided into seven levels, namely, > 130,120-129,110-119,100-109,90-99,80-89 and <80 mg/pupa,the weights of 48. 44% of the pupae from artificial diet ranged from 90 - 110 mg, and those of 51. 62% of the pupae from natural diet ranged from 80 - 100 mg. The egg numbers in female moths of 3rd generation on artificial diet from these pupal weight levels were 1050 ± 358, 876 ± 280, 876±192, 971 ± 110, 921 ± 117, 764 ± 156 and 613±133, respectively, while that on natural diet was 496 ± 179. It was indicated that there was positive correlation between egg number and pupal weight of female pupa,and the range of female pupal weight possessed highest fecundity potential was from 80 to 110 mg.