Mass releases of Aphidius rhopalosiphi (Hymenoptera: Aphidiinae), and strip management to control of wheat aphids |
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| Institution: | 1. Unité d’Ecologie et de Biogéographie, Centre de Recherche sur la Biodiversité, Université catholique de Louvain, Croix du Sud n°4,5, 1348 Louvain-la-Neuve, Belgium;2. Unité de génétique, Centre de Recherche sur la Biodiversité, Université catholique de Louvain, Croix-du-Sud 2 box 14, 1348 Louvain-la-Neuve, Belgium;1. DipSA (Department of Agricultural Science), Alma Mater Studiorum, University of Bologna, Viale G. Fanin 42, 40127, Bologna, Italy;2. Department of Crop Protection, Agrotecnio, University of Lleida, Av. Alcalde Rovira Roure 191, 25198, Lleida, Spain;3. Department of Sustainable Plant Protection, IRTA, Av. Alcalde Rovira Roure 191, 25198, Lleida, Spain;1. Key Laboratory of Environmental Exposure and Health of Guangzhou City, School of Environment, Jinan University, Guangzhou 510632, Guangdong, China;2. Joint Genome Institute, Lawrence Berkeley National Laboratory, Walnut Creek 94598, CA, USA;1. Faculty of Mathematics and Sciences, Department of Biology and Ecology, University of Niš, Višegradska 33, 18000, Niš, Serbia;2. Faculty of Biology, Institute of Zoology, University of Belgrade, Studentski trg 16, 11000, Belgrade, Serbia |
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| Abstract: | Biological control of cereal aphids was attempted during two years, using two approaches: (1) mass-release of Aphidius rhopalosiphi (21,000 individuals/ha) in May and (2) use of a clover-ryegrass strip as a parasitoid reservoir. Two aphid species (Metopolophium festucae and Acyrtosiphon pisum) considered as alternative hosts for cereal aphid parasitoids occurred in the grassy strips. Three fields for each of the mass release or strip management were compared in 2000 with two control fields where no aphid control was done. Aphid population growth was significantly reduced under both mass release and management compared to controls. There was no significant difference between the two treatments. Yet, the parasitism rates were significantly higher under mass release and strip management than in the controls. In 2001, three fields per treatment were compared with three controls. Aphid numbers were very low in all fields, strip management being the only treatment to slow down aphid population growth. |
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