DOI: 10.31220/agriRxiv.2022.00124

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  Abstract: Abstract Recent studies have shown the sensitivity of wild house mice to ZnP poison in Australia is significantly lower than previously assumed which may account for the reported variability in efficacy of ZnP baits used for broadacre control of house mice in grain growing regions. Under laboratory conditions ZnP-coated grains coated with a new higher dose (50 g ZnP/kg grain) were readily consumed but its efficacy under natural field has not been tested. To test if the newly derived ZnP50 (50 g ZnP/kg grain) was more effective under field conditions than the currently registered ZnP25 (25 g ZnP/kg grain) in reducing populations of house mice during a mouse population irruption. We used a Before-After-Control-Impact (BACI) design analysing population size estimate changes in a replicated field trial. We assessed mouse abundance changes after baiting in recently sown paddocks with either ZnP50 (n=3) or ZnP25 (n=3) compared to unbaited Control sites (n=3) grain. Our results showed a median of >85% reduction in mouse numbers as a result of the ZnP50 Treatment. Using simulation modelling we show that under similar circumstances, the use of the ZnP50 formulation will 29 deliver >80% reduction in population size most (>90%) of the time. In contrast, the current registered bait (ZnP25) achieved approximately 70% reduction and produced highly variable results. We would only be confident of getting an 80% reduction in population size, 20% of the time using the currently registered ZnP25 bait under similar field conditions. Consistent with laboratory studies, this study demonstrates the far higher probability of achieving a high kill rate with the new ZnP50 bait compared to the currently registered formulation (ZnP25). By using the new ZnP50 bait, farmers are far more likely to get good kill rates thereby reducing the need for repeated baiting (which is costly and generally ineffective at protecting newly sown crops) or use higher application rates (3-5 kg/ha) that exceed those permitted by labels. This will result in minimising the cost of control to farmers and reduce the number of toxic grains being spread to control mice.

  Key words: znp; znp50; control; znp25; bait; registere

  Submit time: 1 January 2022

  Copyright: The copyright holder for this preprint is the author/funder, who has granted agriXiv a license to display the preprint in perpetuity.
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