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(1) The descriptive abilities of several difference equation models for density de have been examined, first by a qualitative comparison of their flexibility and se considering their ability to describe thirty sets of data on density dependent mort (2) The qualitative comparison demonstrated that two of the models have form are particularly flexible. The quantitative comparison indicated that of these due to Maynard Smith & Slatkin (1973) is better able to describe a wide range of

An introduced whitefly species, responsible for over a half billion dollars in damage to U.S. agricultural production in 1991, is morphologically indistinguishable from Bemisia tabaci (Gennadius). However, with the use of polymerase chain reaction-based DNA differentiation tests, allozymic frequency analyses, crossing experiments, and mating behavior studies, the introduced whitefly is found to be a distinct species. Recognition of this new species, the silverleaf whitefly, is critical in the search for management options.

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