Effect of flower traits and hosts on the abundance of parasitoids in perennial multiple species wildflower strips sown within oilseed rape (Brassica napus) crops
[en] Reducing the use of insecticides is an important issue for agriculture today. Sowing wildflower strips along field margins or within crops represents a promising tool to support natural enemy populations in agricultural landscapes and, thus, enhance conservation biological control. However, it is important to sow appropriate flower species that attract natural enemies efficiently. The presence of prey and hosts may also guide natural enemies to wildflower strips, potentially preventing them from migrating into adjacent crops. Here, we assessed how seven flower traits, along with the abundance of pollen beetles (Meligethes spp., Coleoptera: Nitidulidae) and true weevils (Ceutorhynchus spp., Coleoptera: Curculionidae), affect the density of parasitoids of these two coleopterans in wildflower strips sown in an oilseed rape field in Gembloux (Belgium). Only flower traits, not host (i.e. pollen beetles and true weevils) abundance, significantly affected the density of parasitoids. Flower colour, ultraviolet reflectance and nectar availability were the main drivers affecting parasitoids. These results demonstrate how parasitoids of oilseed rape pests react to flower cues under field conditions. Similar analyses on the pests and natural enemies of other crops are expected to help to develop perennial flower mixtures able to enhance biological control throughout a rotation system.
Research Center/Unit :
TERRA Teaching and Research Centre - TERRA
Disciplines :
Environmental sciences & ecology Agriculture & agronomy Entomology & pest control
Author, co-author :
Hatt, Séverin ; Université de Liège - ULiège > R&D Direction : Chercheurs ULiège en mobilité
Uyttenbroeck, Roel ; Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Biodiversité et Paysage
Chevalier Mendes Lopes, Thomas; Gembloux Agro‑Bio Tech, University of Liège, Gembloux, Belgium > Department of Agronomy, Biology and Chemistry > Functional and Evolutionary Entomology
Chen, Julian; Chinese Academy of Agricultural Sciences > Institute of Plant Protection > State Key Laboratory for Biology of Plant Diseases and Insect Pests
Piqueray, Julien; Natagriwal Asbl
Monty, Arnaud ; Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Biodiversité et Paysage
Francis, Frédéric ; Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Gestion durable des bio-agresseurs
Language :
English
Title :
Effect of flower traits and hosts on the abundance of parasitoids in perennial multiple species wildflower strips sown within oilseed rape (Brassica napus) crops
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