Parous Rates in Wisconsin Mosquito Populations1

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Abstract
Populations of Psorophora ferox and Aedes species, with the exception of A. triseriatus, were found to have low parous ratios when their populations were increasing or at their peak and generally high parous ratios when populations were declining or stable. This information is of value in determining when to initiate sampling of natural populations of mosquitoes for arbovirus surveillance and in evaluating vector potential of a species from the standpoint of its longevity and refeeding habits. In general, for arbovirus surveillance, sampling of Aedes communis group, A. vexans, A. stimulans, P. ferox and Culex species would be most efficient if begun 1 week after a peak in abundance; for A. trivittatus and A. cinereus 2 weeks after peaks; and for A. canadensis 3 weeks after peaks. For A. triseriatus and Mansonia perturbans efficient sampling can be done during peaks of abundance. On a seasonal basis, at least 1/3 of the CO2-trappable parts of populations of P. ferox, A. trivittatus, A. cinereus, A. triseriatus and A. stimulans became parous and sought a second bloodmeal while only 1/5 of populations of A. vexans, A. communis group and A. canadensis became parous and sought a second bloodmeal. Parity was determined on 22,000 specimens.

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