Abstract

IANNACONE, José  and  ALVARINO, Lorena. Selectivity of the cartap insecticide employing bioassays with non target organisms. Ecol. apl. [online]. 2005, vol.4, n.1-2, pp.91-104. ISSN 1726-2216.

The aim of the current research was to evaluate cartap ( Bala® 50 SP ) ecotoxicity on eight non target animal organisms: 1) Melanoides tuberculata ( Müller, 1774 ) ( Mollusca ) , 2) Emerita analoga ( Stimpson, 1857 ) ( Crustacea ) , 3) Chironomus calligraphus Goeldi, 1805 ( Diptera ) , 4) Cyprinus carpio ( Linné, 1758 ) ( Osteichthyies ) , 5) Eisenia foetida ( Savigny, 1826 ) ( Annelida ) , 6) Podisus nigrispinus ( Dallas, 1851 ) (Hemiptera ) , 7) Trichogramma fuentesi Torre, 1980 ( Hymenoptera ) and 8) Trichogrammatoidea bactrae Nagaraja. 1979 ( Hymenoptera ) , and to evaluate selectivity of this insecticide. Acute toxicity parameters were mean lethal concentration ( LC50 ) ( mg o μg L-1 ) , mean lethal dose (LD50) ( mg o μg kg-1 ) and mean lethal time ( TL50 ) ( h ) . The sequence of sensibility to cartap in the aquatic environment in terms of LC50 at 24 h exposure was: E. analoga > C. carpio > Ch. calligraphus > M. tuberculata. For E. foetida, with higher cartap soil doses mortality was increased, and from 257 mg AI of cartap kg-1 onwards, diminishing wet weights were observed. In P. nigrispinus nymphs II, contact effects produced higher mortality than immersion effects. T. bactrae showed higher egg emergence sensibility than T. fuentesi. Cartap showed selectivity on seven of the eight species analyzed. Only E. analoga showed risks at the aquatic environmental level.

Keywords : ecotoxicology; bioassays; Cyprinus; Chironomus; Eisenia; Emerita; Melanoides; Podisus; Trichogramma; Trichogrammatoidea.

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