The Iowa Soybean Pod Test for Predicting Phomopsis Seed Decay in Kansas

Abstract

The Iowa pod test for predicting the need for foliar fungicide applications to control Phomopsis seed decay of soybeans (Glycine max) was evaluated under Kansas growing conditions. The mean incidence of pod infection by Phomopsis longicolla was 50, 15, and 50% in 1987, 1988, and 1989, respectively. No correlation was found between the incidence of P. longicolla on pods at soybean growth stage R6 and either the incidence of the fungus on seeds or the germination of seeds at harvest. For seeds from plants treated with benomyl, the percentage of pathogens detected was not significantly different from that of seeds from unsprayed plants in 1987 and 1988 (.)