ABSTRACT

The rose aphid, Macrosiphum rosivorum (Zhang), is a serious pest of roses in China. Currently, M. rosivorum is managed using almost exclusively with insecticides; therefore, effective, alternative strategies are needed to reduce this dependence on pesticides and the risk of the development of resistance in rose aphids. This study was conducted to evaluate the potential of the seven-spot ladybird, Coccinella septempunctata (L.), as a biological control agent of M. rosivorum in rose production fields.

We determined the prey preference of C. septempunctata at constant densities of M. rosivorum for 1st – 4^th instar nymphs and for adults. The results showed that Coccinella septempunctata adults had its highest rate of consumption on 4^th instars and its lowest rate of consumption on adults among prey life stages. Furthermore, we defined the functional response of predator adults. C. septempunctata adults displayed a type II functional response on all prey stages. The highest attack rate and shortest handling time were for predators fed 1st instar aphids. The proportion of prey consumed by C. septempunctata was higher at lower densities for all stages of rose aphid, implying that C. septempunctata should be released early in an aphid infestation. Our study indicated that C. septempunctata has the potential to be used for control of rose aphids in rose-production fields.

摘要

玫瑰蚜虫( Macrosivorum (Zhang))是一种严重的玫瑰害虫。目前，M. rosivorum几乎完全使用杀虫剂进行管理。因此，需要有效的替代策略来减少对杀虫剂的依赖以及玫瑰蚜虫产生抗药性的风险。本研究旨在评估七斑瓢虫Coccinella septempunctata (L.)在玫瑰生产领域中作为M. rosivorum生物防治剂的潜力。

我们确定了C. septempunctata在M. rosivorum的恒定密度下对 1-4^龄若虫和成虫的猎物偏好。结果表明，七龄球蚧成虫的4龄消费率最高^，成虫在猎物生命阶段的消费率最低。此外，我们定义了捕食者成年人的功能反应。C. septempunctata成虫在所有猎物阶段都表现出 II 型功能反应。以一龄蚜虫为食的捕食者攻击率最高，处理时间最短。C. septempunctata消耗的猎物比例在玫瑰蚜虫所有阶段的较低密度下较高，这意味着C. septempunctata应该在蚜虫侵染的早期释放。我们的研究表明C. septempunctata有潜力用于控制玫瑰生产领域的玫瑰蚜虫。