Abstract
The effects of Pythium paroecandrum and P. ‘spherical’ on seed yield of white bean ( Phaseolus vulgaris L.) were determined under field conditions. Fenaminosulf (Lesan) applied as a soil drench selectively suppressed Pythium populations in soil and increased seed yields by 47% in 1976 and by 33% in 1977. Fumigation of soil with DD-MIT (Vorlex), a commercial mixture of methyl isothiocyanate, dichloropropenes and dichloropropanes, reduced populations of Pythium and Fusarium in soil and increased seed yields by 79% in 1976 and by 29% in 1977. The combination of fenaminosulf and DD-MIT produced the greatest reductions in soil populations of Pythium and Fusarium and increased seed yields by 65%. Pythium paroecandrum and P. ‘spherical’ were associated with feeder-root necrosis and were the only bean-root pathogens detected at the experimental site. In this study, losses in seed yield of white bean due to Pythium root rot were estimated to be 44% in 1976 and 39% in 1977.
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