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On the Cover: Backlit image of the commercial soybean cultivar Asgrow 3905 [Glycine max (L.) Merr.] taken 14 days post inoculation with soybean rust (Phakopsora pachyrhizi Syd. & P. Syd.). Soybean rust lesions were at the sporulation stage 14 days after inoculation. Disease severity was measured as the proportion of the leaf area with chlorotic or necrotic lesions. As the impact of disease severity increased, there was a small linear decline in leaf absorptance and a negative exponential decline in leaf carbon exchange rate. Yield losses attributable to soybean rust were found to be caused by a number of factors, including accelerated leaf drop and lesions on the remaining leaf area. See the companion papers Kumudini et al., p. 2334 and p. 2342. Photo by Joe Omielan.