Sofia University”St. Kliment Ohridski”, Department of Ecology and Environmental Protection, Faculty of Biology, BG - 1164 Sofia, Bulgaria
MARKOVA, E., 2010. Influence of the insecticide Fozalon on the structure of syrphid community (Diptera: Syrphidae) in an alfalfa ecosystem. Bulg. J. Agric. Sci., 16: 1-8
The goal of the study was to establish the influence of the insecticide fozalon upon main population and coenotic parameters of the syrphid flies (Diptera: Syrphidae) – a basic component in the useful entomofauna of the agro-coenoses. The effect of the insecticide on the number of species and qualitative composition of the syrphid coenosis was unessential. The influence of the insecticide fozalon on the population density of each species and the total average density of the community was negative and clearly manifested. The negative effect occurs immediately after the treatment and it was longer for some species. The dominant structure shows no significant change after treatment compared to the same area before the treatment. The used indices for the species structure of the communities in the investigation show a relatively less unfavorable ecological situation for the syrphid cenosis in the field after insecticide treatment.