Field experiment on the efficacy of 0.2％ curcumol baits in controlling farmland rodents
Objective To verify the field efficacy of 0.2%curcumol baits against farmland rodents and determine the optimal dose.Methods A field experiment with 0.2%curcumol baits at three doses 1500,3000,and 4500 g/hm2 was carried out in the plague foci of Lijiang,Yunnan Province,China.The changes in rodent density,uterine development status,pregnancy rate,and litter size were investigated at 30,60,and 90 days after baiting.The bait efficacy and intake level were calculated with the use of Excel 2010 software.Results The control effects of curcumol baits at 1500,3000,and 4500 g/hm2 groups were 47.06%,51.87%,and 57.65%at 30 days,respectively;50.00%,63.64%,and 60.00%at 60 days,respectively;and 54.55%,62.81%,and 50.91%at 90 days,respectively.The number of subadults decreased substantially,and the pregnancy rate and average litter size of female adult rodents also decreased.The curcumol bait intake coefficient of rodents was 0.77.No dead rodents or non-target organisms were observed during 15 consecutive days of investigation since the first day after baiting.Conclusion 3000 g/hm2 of 0.2%curcumol baits is recommended for controlling farmland rodents based on the control effects and the economic threshold.
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