Diseased and Healthy Immigrating Insects

This chapter builds on the models developed in Chapter 26 by distinguishing two cohorts of a population infected with a disease. The two populations modeled here are insects that suffer from a disease that increases mortality for the infected nymphs and adults, and also decreases their egg-laying rate. Unlike the previous chapters we assume here two populations of insects, living in two fields. One of the fields has generally better living conditions than the other, although the current year’s carrying capacities are randomly generated, and there is some overlap in the ranges within which the carrying capacity fluctuates. Carrying capacity has a direct effect on birth rates.