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Eprinomectin from a sustained release formulation adversely affected dung breeding insects

Nieman, C.C., Floate, K.D., Düring, R.A., Heinrich, A.P., Young, D.K., Schaefer, D.M. (2018). Eprinomectin from a sustained release formulation adversely affected dung breeding insects, 13(8), http://dx.doi.org/10.1371/journal.pone.0201074

Abstract

© 2018 Nieman et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. The insecticidal activity of parasiticide residues in dung of cattle treated with a sustained release eprinomectin formulation was examined, and an improved eprinomectin dung residue extraction method is presented. Emergent insect abundance and richness were significantly reduced in all post-treatment intervals (7, 14, 28, 56, 84, 112, and 140 d), relative to pre-treatment. Emergent insect diversity was reduced for between 84 and 112 d post-treatment. Collembola were not affected by residues. Chemical analyses subsequently documented residues of eprinomectin in dung of each collection period post-treatment at levels expected based on previously reported excretion profiles for this product. Cattle subcutaneously injected with this product excreted residues that reduced dung-breeding insect emergence for 5 mo post-treatment. The consequences of these long-term non-target effects to pasture ecosystems are not known.

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