AbstractThree pesticides, dimethoate, pirimicarb and fenpropimorph, had a negative impact on the colonization of a sterilized soil by a natural population of soil protozoa. Fenpropimorph has an effect at the lowest concentration applied; 25 mg litre−1. Dimethoate reduced the soil respiration significantly for about 10 days after application. In single species cultures of soil protozoa in liquid media, a flagellateCercomonassp., was a better test organism than a ciliate,Colpodasp., or an amoeba,Acanthamoebasp., with respect to interpretation of dose‐response curves and ease of observat
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