Effects of mixed cropping on population densities and parasitism rates of the diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae)
Effects of mixed cropping on population densities and parasitism rates of the diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae)
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DOI：
10.1007/s13355-011-0036-z
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发表时间：
2011-05-01
影响因子：
1.3
通讯作者：
Koji, Shinsaku
中科院分区：
文献类型：
--
作者：
Adati, Taro;Susila, Wayan;Koji, Shinsaku
混作和屏障作物对小菜蛾种群密度和寄生的影响(鳞翅目：小菜科)，在印度尼西亚巴厘岛种植的卷心菜的田间小区中进行了评估。甘蓝/香菜混作小区的小菜蛾在幼虫期和幼虫期的密度以及幼虫期和蛹期的总密度均显著低于甘蓝单作小区。单作和混作对小菜蛾幼虫的寄生作用无显著差异。这些结果不支持所谓的天敌假说，但表明在香菜混作系统中观察到的联合抗性背后的机制是邻近非寄主植物对雌蛾寻找寄主行为的破坏。在混作和单一栽培小区之间设置纳皮尔草屏障并不影响混作对幼虫和幼虫密度的影响。因此，在当地被用作围栏以防止牲畜入侵田地的纳皮草，不会阻碍香菜/卷心菜混种的减虫效果。
Effects of mixed cropping and barrier crops on the population density and parasitism of the diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae), were evaluated in field plots of cabbage grown in Bali, Indonesia. The densities of P. xylostella at larval and pupal stages, as well as the overall density at larval plus pupal stages, were significantly lower in cabbage/coriander mixed cropping subplots than in cabbage monoculture subplots. Parasitism of P. xylostella by the larval parasitoid Diadegma semiclausum (Hellen) (Hymenoptera: Ichneumonidae) was not significantly different between the mixed and monocultural cropping systems. These results do not support the so-called enemies hypothesis, but suggest that disruption of the host searching behavior of female moths by neighboring non-host plants is the mechanism behind the associational resistance observed in the coriander mixed cropping system. The inclusion of a Napier grass barrier between mixed crop and monoculture subplots did not affect the influence of mixed cropping on larval and pupal densities. Therefore, Napier grass, which is used locally as a fence for preventing livestock invasion of fields, would not obstruct the pest-reducing effect of coriander/cabbage mixed cropping.