Occurrence of Soybean Stem Canker (Diaporthe phaseolorum var. meridionalis) in Wisconsin

Plant Disease
S LiG L Hartman

Abstract

Soybean (Glycine max) developed symptoms characteristic of stem canker during the 2000 to 2003 growing seasons in Wisconsin. Symptoms were widespread in 2003 and were associated with yield losses of ≈1% statewide and as much as 25% in individual fields. Affected plants expressed dieback of foliage beginning at growth stage R3 and progressed until the R6 growth stage. Dark brown lesions were frequently observed at a single node on the lower portion of stems of plants expressing foliage dieback. Fungi were isolated from symptomatic plants collected from seven growers' fields in Rock, Sauk, Veron, and Walworth counties and the Arlington and Marshfield Agricultural Research Stations. Stems with lesions were cut into ≈5-mm pieces, surface disinfested with a 0.5% NaOCl solution for 3 min, rinsed three times in sterile distilled water, and placed on water agar (WA) or potato dextrose agar (PDA) at pH 4.5. Hy-phal tips from colonies of interest were excised and placed on acidified PDA at 25°C under continuous light for 25 to 30 days. In addition to Diaporthe phaseolorum var. caulivora (the cause of northern stem canker), four isolates of D. phaseolorum var. meridionalis (the cause of southern stem canker) were isolated. Colonies of D. ...Continue Reading

Citations

Feb 1, 2010·Plant Disease·X LuF W Nutter

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