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Relationship between greenhouse and field ratings for brown stem rot reaction in soybean glycine max

, : Relationship between greenhouse and field ratings for brown stem rot reaction in soybean glycine max. Crop Science 26(4): 665-667

To justify greenhouse selection for disease resistance, greenhouse disease reactions should be indicative of disease reactions under field conditions. Field and greenhouse tests were conducted to determine the relationship between field and greenhouse reactions of soybean [Glycine max (L.) Merr.] lines to Phialophora gregata (Allington and Chamberlain) W. Gams, the cause of brown stem rot (BSR). Twenty-five soybean lines of Maturity Group III and 20 soybean lines of Maturity Group IV were rated for BSR reaction in field and greenhouse tests. The BSR ratings included counts of nodes showing leaf and stem symptoms in both field plots and greenhouse pots. Visual estimates of leaf symptom incidence in field plots were also recorded. Greenhouse leaf symptoms were highly correlated with the reactions of soybean lines under field conditions where susceptibility standards showed obvious leaf symptoms. Selection based on greenhouse leaf symptoms identified soybean lines with field resistance to BSR. Resistance was associated with a 12 to 16% yield advantage when disease developed to the point of causing leaf symptoms in susceptible soybean lines.

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