Fig. 1. Regression lines for soybean sudden death syndrome disease index (DX) from field experiments with disease severity (DS) from four greenhouse experiments among 30 soybean lines. The greenhouse experiments were conducted at three Fusarium solani f. sp. glycines inoculum rates: (a) low (3.3 x 10³), (b) moderate inoculum rate (5 x 10³), and (c) high (10⁴). While the moderate inoculum rate explained more variation in field DX and produced predicted values that were close to those observed in the field, the low and high inoculum rates produced predicted field DX values that were higher and lower than those observed in the field in this population, respectively.