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Selectivity of the insecticide metamidophos on eight not-target terrestial organisms The organophosphorus methamidophos is one of the most employed pesticides in Peruvian agriculture. This research aimed to evaluate the ecotoxicological effect of two formulations of methamidophos belonging to different toxicological classes [Monofos®, class Ia (extremely dangerous), and Tamaron®, class Ib (highly dangerous)] on eight non-target terrestial organisms: Eisenia foetida (Savigny, 1826) (Oligochaeta: Lumbricidae), Porcellio laevis (Latreille, 1804) (Isopoda: Porcellionidae), Chrysoperla externa (Hagen, 1861) (Neuroptera: Chrysopidae), Orius insidiosus (Say, 1832) (Hemiptera: Anthocoridae), Podisus nigrispinus (Dallas, 1851) (Heteroptera: Pentatomidae), Cryptolaemus montrouzieri (Mulzant, 1853) (Coleoptera: Coccinellidae), Copidosoma koehleri (Blanchard, 1940) (Hymenoptera: Encyrtidae) and Leptomastidea abnormis (Girault, 1915) (Hymenoptera: Encyrtidae). The sequence of higher to low risk quotients (RQ) to methamidophos Ia was: L. abnormis > C. koehleri > O. insidiosus > P. laevis > C. externa > C. montrouzieri. However, to methamidophos Ib was: L. abnormis > E. foetida > O. insidiosus > C. koehleri > P. laevis > C. externa > P. nigrispinus. Both formulations of methamidophos produced high risk of effect to L. abnormis and low risk to C. externa, C. montrouzieri and P. nigrispinus at doses recommended for pest control. RQ indicated that use of methamidophos is highly risky to terrestial environment. |
