Contents of carbohydrates, protein, and lipids in tissues of insect prey constitute the required energy reserve utilized by their predators. Their amounts define the preference of the predator to certain prey on which its biological performance is the optimum. Feeding preferences and longevity of the 3 coccinellid beetles; Coccinella septempunctata L., C. undecimpunctata L., and Scymnus interruptus L. were studied in relation to energy reserve in tissues of the cabbage aphid, Brevicoryne brassicae (Lin.). The level of energy reserve increased with increasing of aphid nymphal instars showing the highest in 4th instar (0.10844 cal/mg). Lipids and carbohydrates represented the highest energy reserve average rate in B. brassicae adults (0.29139 and 0.07404 cal/mg), respectively. C. septempunctata larval stage recorded the highest efficiency in daily predation (89.42 prey), when fed on 1st instar nymphs of the aphid. It required 21 days when fed on the 3rd nymphal instar of B. brassicae. S. interruptus larval stage reflected the lowest consumption and longevity in predation where it consumed less than 69.25 prey/day and lasted a period less than 17.5 days. Generation time for C. undecimpunctata lasted the longest (20.89 days) when fed on B. brassicae 1st nymphal instar. It was decreased in S. interruptus recording (12.22 days) when fed on B. brassicae 3rd nymphal instar. Only C. septempunctata was efficient in predation and its biological performance was the best compared to the other tested coccinellid species. Use of C. septempunctata can be recommended when applying biological control programs in the field against the cabbage aphid.

中文翻译：

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在实验室条件下，Brevicoryne brasicaica（Lin。）（Homooptera：Aphididae）幼虫的能量储备及其对三种球虫物种的捕食和寿命的影响

昆虫猎物组织中碳水化合物，蛋白质和脂质的含量构成其捕食者利用的所需能量储备。它们的数量决定了捕食者偏爱某些生物性能最佳的猎物。3种球虫的摄食偏好和寿命；研究了球果七星瓢虫，十一角瓢虫和间断镰刀L.与卷心菜蚜虫Brevicoryne Brassicae（Lin。）的组织中的能量储备有关。能量储备水平随蚜虫若虫幼虫的增加而增加，在第四龄幼虫中最高（0.10844 cal / mg）。血脂和碳水化合物分别代表了芸苔芽孢杆菌成虫的最高能量储备平均率（0.29139和0.07404 cal / mg）。C。当以蚜虫的第一龄若虫为食时，septempunctata幼虫期在日常捕食中的效率最高（捕食率为89.42）。以芸苔芽孢杆菌的三龄若虫取食需要21天。中断链球菌幼虫期在捕食中的消耗和寿命最低，每天消耗少于69.25猎物，持续时间少于17.5天。当以芸苔小球藻（B. brasicae）第一只若虫龄为食时，十一倍体C. undecimpunctata的世代时间最长（20.89天）。以芸苔芽孢杆菌第三龄若虫龄为食，在中断链球菌记录（12.22天）中减少了。与其他测试的球虫种类相比，只有七叶锦葵（C. septempunctata）的捕食能力高，其生物学性能最佳。使用C。