In 1998, the City of Brookfield, WI, proposed controlling nuisance mosquitoes with the first biological larvicide, a bacterium (B. sphaericus), to be registered for use in North America. In order to approve the annual use of B. sphaericus in Brookfield, the Wisconsin Department of Natural Resources (DNR) required a study lasting 3 years to answer the question as to whether B. sphaericus could reduce the local mosquito population without affecting the nontarget invertebrate community. I was part of a team that planned and conducted this 3-year ecological impact study.


Work contracted by the Wisconsin Department of Natural Resources | Milwaukee, WI


logistical preparation, habitat surveying, population sampling, data processing, application of experimental biological control methods, and manuscript preparation


R.W. Merritt, J.L. Lessard, K.J. Wessell, O. Hernandez, M.B. Berg, J.R. Wallace, J.A. Novak, J. Ryan, & B.W. Merritt. (2005). “Lack of effects of Bacillus sphaericus (Vectolex®) on nontarget organisms in a mosquito control program in southeastern Wisconsin: A 3-year study.” J. Amer. Mosq. Contr. Assoc., 21(2), pp. 201-212.