Abstract
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.
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Acknowledgments
We thank two anonymous reviewers for their valuable comments on the manuscript. We also thank Kohji Yamamura for statistical advice and Yoshito Suzuki for his helpful comments on an earlier version of the manuscript. This study was supported by a Matching Fund Subsidy for Private Universities as an “Academic Frontier” Project from the Japanese Ministry of Education, Culture, Sports, Science and Technology to the Tokyo University of Agriculture.
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Adati, T., Susila, W., Sumiartha, K. et al. Effects of mixed cropping on population densities and parasitism rates of the diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae). Appl Entomol Zool 46, 247–253 (2011). https://doi.org/10.1007/s13355-011-0036-z
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DOI: https://doi.org/10.1007/s13355-011-0036-z