Evaluation of the fungicide manganese-zinc ethylene bis(dithiocarbamate) (mancozeb) for sublethal and acute toxicity to Eisenia fetida (Oligochaeta)

Vermeulen L.A. ; Reinecke A.J. ; Reinecke S.A. (2001)


This article describes the outcome of laboratory experiments to determine the acute and sublethal effects of the fungicide mancozeb on the earthworm Eisenia fetida. Apart from a standardized acute test, young worms, 25 days old, were exposed to mancozeb mixed into a urine-free cattle manure substrate. Five groups of 10 worms each were used per concentration level (0, 8, 44 mg/kg substrate). The following life-history parameters were measured: growth in consecutive weeks over a 6-week period, survival rate, maturation time, cocoon production, hatching success of cocoons, number of hatchlings per cocoon, and incubation time of cocoons over another 4 weeks. The results indicated that mancozeb had no significant detrimental effect on either growth or reproduction of E. fetida at the recommended dose (8 mg/kg) or at an estimated environmental concentration (44 mg/kg). The findings do not support the hypothesis that avoidance response to mancozeb could serve as an indication of toxicity. © 2001 Academic Press.

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