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Weathering and the field efficacy of pelletized rodenticide baits in orchards |
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| Authors: | Mark H Merson Ross E Byers |
| Institution: | Winchester Fruit Research Laboratory, Virginia Polytechnic Institute and State University, Winchester, Virginia 22601, USA |
| Abstract: | Commercially available US rodenticide bait formulations were tested in the field and laboratory to examine their weather resistance and the influence of moisture on efficacy and acceptability to voles (Microtus spp.). Baits containing one of several anticoagulant compounds or zinc phosphide (Zn3P2) were mechanically broadcast in orchard plots. Precipitation (7·62 mm) fell within 48 hours after application. There was not a marked difference in control between the multiple-feeding anticoagulants and the single-feeding anticoagulants or zinc phosphide. Laboratory tests showed that moist pellets of three rodenticide formulations were as effective and acceptable to pine voles (M. pinetorum) as dry pellets. No direct relationship was found to show that wet weather or moisture resistance of the given rodenticide formulations tested affected field control or laboratory mortality. Toxicity and concentration of the active ingredient in formulations used were important to efficacy. |
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