Abstract
Increasing plant diversity within crops can be beneficial for pest control. In this field study, the effects of two wheat and pea associations (mixed cropping and strip cropping) on aphid populations were compared with pure stands of both crops by observations on tillers and plants. Pea was more susceptible to infestations than wheat. As expected, the density of aphid colonies was significantly higher in pure stands during the main occurrence periods, compared with associations. Additionally, flying beneficials, such as not only aphidophagous adult ladybirds but also parasitoid, hoverfly and lacewing species that feed on aphids at the larval stage, were monitored using yellow pan traps. At specific times of the sampling season, ladybirds and hoverflies were significantly more abundant in the pure stand of pea and wheat, respectively, compared with associations. Few parasitoids and lacewings were trapped. This study showed that increasing plant diversity within crops by associating cultivated species can reduce aphid infestations, since host plants are more difficult to locate. However, additional methods are needed to attract more efficiently adult beneficials into wheat and pea associations.
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Acknowledgments
The authors thank the technicians from the Crop Management Unit of Gembloux Agro-Bio-Tech (University of Liège, Belgium) for the installation and management of experimental fields, Dr. Y. Brostaux for help with statistical analyses, Axel Vandereycken for help with graphics and the Belgian National Fund for Scientific Research (FNRS) for providing PhD fellowship.
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Edited by Wesley AC Godoy—ESALQ/USP
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Lopes, T., Bodson, B. & Francis, F. Associations of Wheat with Pea Can Reduce Aphid Infestations. Neotrop Entomol 44, 286–293 (2015). https://doi.org/10.1007/s13744-015-0282-9
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DOI: https://doi.org/10.1007/s13744-015-0282-9