The impact of compounds allowed in organic farming on the above-ground arthropods of the olive ecosystem.
Le résumé fourni par la source
The aim of this research was to evaluate the impact of compounds utilised against Bactrocera oleae (Rossi) on epigeic arthropod fauna. Rotenone, azadirachtin and copper oxychloride were the tested compounds. Occurrence and abundance of arthropods known for their sensitivity to habitat alterations and environmental perturbations were registered. Results showed that rotenone caused the largest reduction of arthropod abundance in comparison with azadirachtin and copper oxychloride. The impact on nontarget arthropods was low for copper oxychloride and high for rotenone. Among surveyed taxa, Isopoda and other Coleoptera were the most reduced by rotenone and azadirachtin spraying. The lowest impact was showed by copper oxychloride which strongly reduces only Coleoptera, while no impact was detected for Araneae and Formicidae. The impact of tested active ingredients was higher on the above-ground arthropods than on canopy ones showed in previous studies. This could be due to the low dispersal ability of above-ground arthropods, mainly walkers, in comparison to canopy ones, mainly fliers. Our findings suggest to promote the use of preventive control strategies in order to reduce the use of any kind of pesticides in organic olive groves enhancing the ecological sustainability of agricultural systems.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.