首页 | 本学科首页   官方微博 | 高级检索  
   检索      


A multi-site experiment to test biocontrol effects of wildflower strips in different French climate zones
Institution:1. Mediterranean Institute of Biodiversity and Ecology (IMBE), CNRS, IRD, Avignon University, Aix-Marseille University, IUT, Agroparc, BP 61207, Avignon 84911 , France;2. Institute of Genetics, Environment and Plant Protection (IGEPP), INRAE, Institute Agro, Univ. Rennes, 2 Rue André le Nôtre, Angers 49000 , France;3. Institute of Genetics, Environment and Plant Protection (IGEPP), INRAE, Institute Agro, Univ. Rennes, 65 Rue de Saint-Brieuc, 35000 Rennes, France;4. Agroecology, INRAE, Institute Agro, Univ. Bourgogne, Univ. Bourgogne-Franche-Comt;5. INRAE, UR1115 Plantes et Système de cultures Horticoles, Agroparc CS 40509, Avignon 84914-CEDEX-9, France;6. Agronomie, INRAE, AgroParisTech, Université Paris-Saclay, Thiverval-Grignon 78850 , France
Abstract:Sowing of wildflower strips has been integrated in agri-environment schemes of several European countries. Their beneficial effects on natural enemies of pest insects are well documented but (1) the desired spill-over into crop fields has not always been demonstrated, and (2) the need to adapt sown mixtures to regional climatic differences has been rarely addressed.We set up a multi-site experiment in different French climatic regions to compare effects of a wildflower strip with a grass mixture and spontaneous vegetation. The design included five regions, three to five fields per region and the three strip treatments being repeated in each field. We tested strip treatment effects on vegetation (plant species richness, plant and flower cover) and on natural enemies (hoverflies, ladybirds, aphid predation). In a subset, we further analysed the spill-over into winter wheat fields including natural enemies and pest insects (cereal aphids, leaf beetles).The wildflower strip mixture developed well in all regions and increased plant species richness and flower cover compared with grass strips and spontaneous vegetation. We found a corresponding higher hoverfly abundance and aphid predation in wildflower strips that were consistent in all regions, whereas ladybird abundance was not affected. A significantly higher hoverfly abundance, aphid predation and aphid parasitism in wheat fields close to wildflower strips indicated a spill-over. No corresponding margin treatment effects were observed for aphid and leaf beetle abundance in the field. A multivariate analysis comparing the influence of climate and vegetation parameters showed that floral cover better explained variation in natural enemy abundance and predation than climate. Our results demonstrated that similar mixtures of native plants can be used over large climatic gradients to improve biocontrol. Further research is needed to improve spill-over into crop fields and to obtain consistently strong effects in different climate zones.
Keywords:
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号