Abstract
The influence of week of season, leaf position on plants, population size and population growth rate on twospotted spider mite adult and functional sex ratio was determined for wild populations found on field corn. Adult sex ratio became less female biased as the mite population per plant increased. Adult sex ratio became increasingly female biased at higher leaf positions on the plant. Population growth rate (measured as proportion eggs in the population) was positively correlated with the proportion females in the adult population. Functional sex ratio (ratio of sexually available females to males) was positively influenced by population growth rate. The other factors studied only slightly influenced this parameter. Ecological implications of these findings are briefly discussed.
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