caa a22 4500 388035773 CHVBK 20180307125004.0 cr unu---uuuuu 161130e199802 xx s 000 0 eng 10.1017/S0007485300041523 doi S0007485300041523 pii (NATIONALLICENCE)cambridge-10.1017/S0007485300041523 Floate K.D. Agriculture and Agri-Food Canada, Lethbridge Research Centre, PO Box 3000, Lethbridge, Alberta, Canada, T1J 4B1 Off-target effects of ivermectin on insects and on dung degradation in southern Alberta, Canada [Elektronische Daten] [K.D. Floate] Insect activity was significantly reduced in dung from cattle treated with a recommended topical dose (500 μg/kg) of the endectocide, ivermectin. Reductions affected an ecologically and taxonomically diverse group of insects including coprophagous flies, parasitic wasps, and both predacious and coprophagous beetles. Whereas some species appeared unaffected by faecal residues, the emergence of other species was reduced in dung voided ≤ 12 weeks post-application. The species most affected were the flies, Sepsis sp. and Coproica mitchelli (Malloch). eucoilid wasps. and the beetles, Cercyon quisquilius (Linnaeus) and C. pygmaeus (Illiger). Results were consistent within and between years. Similar reductions have been reported previously, but typically for a much shorter post-application period. The greater duration of effect observed in the current study is attributed to a more accurate bioassay, species-level identifications, and the use of sample sizes generally larger than those used in previous studies. Reduced insect activity was associated with slower dung pat degradation. When ivermectin was added directly to dung, at levels previously reported to occur in dung from treated cattle, the treated dung had not appreciably degraded after 340 days in the field. In contrast, untreated dung pats deposited at the same time and place had largely degraded after 80 days in the field. The effect of ivermectin use on pasture quality is probably ‘moot' in southern Alberta because of the current pattern of use. Should this pattern change, however, results of the present study validate the need for future studies to assess the off-target effects of ivermectin use on pasture quality. Copyright © Cambridge University Press 1998 Bulletin of Entomological Research Cambridge University Press 88/1(1998-02), 25-35 0007-4853 88:1<25 1998 88 BER https://doi.org/10.1017/S0007485300041523 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0007485300041523 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Floate K.D. Agriculture and Agri-Food Canada, Lethbridge Research Centre, PO Box 3000, Lethbridge, Alberta, Canada, T1J 4B1 NATIONALLICENCE 773 0- Bulletin of Entomological Research Cambridge University Press 88/1(1998-02), 25-35 0007-4853 88:1<25 1998 88 BER CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge