One method of determing field tolerance of soybeans to Phytophthora mega-sperma f. sp. glycinea (Hildeb.) Kaun & Erwin (Pmg) is to determine the percent of plant loss from emergence to maturity for cultivars grown in an infested field under conditions favorable for the disease (Buzzell and Anderson, 1982). Drawing upon the field results and the results of two unpublished greenhouse experiments (given below), a greenhouse technique similar to the field test was developed. 1962 Experiment : Cores of soil were obtained from a field known to be in-fested with Pmg race 1, the field having been used in a previous study (Ful-ton et al., 1961).