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Methodology utilized to evaluate the efficacy of the experimental rodenticide bromethalin is described. Test site selection and determination of appropriate census techniques for use in different situations were important to the success of the field trial program. The testing program was divided into the following phases: (1) familiarization period, (2) pretreatment census, (3) pretreatment lag phase, (4) treatment period, (5) posttreatment lag phase, (6) posttreatment census, and (7) snap-trapping. The computerized data handling system used for storage and retrieval of data generated in the field trial program is described. A combination of two or three of the following census techniques was used to evaluate rodent activity before and after toxicant treatment: (1) census feed consumption, (2) tracking activity, (3) burrow activity, (4) dropping counts, (5) live trapping, and (6) water consumption. Overall, percentage reductions in activity values were comparable among census techniques. Tracking activity values were lower than those of other techniques in several house mouse trials, indicating the sensitivity of this method for monitoring mouse activity. A representative Norway rat field trial is presented to illustrate data generated through utilization of the previously described methodology and testing program.
methodology, rodenticide, efficacy, commensal rodent, census technique, field trials, bromethalin, vertebrate pest control
Biologist, Lilly Research Laboratories, Greenfield, Ind.
Director, Center for Environemntal Research and Services, Bowling Green State University, Bowling Green, Ohio