Studies were conducted on the biology, and on temperature and humidity responses, of Agathis unicolor (Schrottky), and exotic species. Results were compared with similar studies on the native species, A. glbbosa (Say), and their common host, the potato tuberworm, Phthorimaea operculella (Zeller). The two species of parasites were reared at several constant temperatures and humidities, and life-table data were obtained in each test environment. These data were used to calculate the intrinsic rate of natural increase, which was used as a bioclimatic index for each of the two species. The influence of several different constant temperatures and humidities on the parasites, and on host-parasite relationships, was evaluated on the basis of relative changes in the intrinsic rate of increase, developmental time, and the mean generation time.
