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Reference Report for SoyBase12402949
Title:First report of soybean stem canker caused by Diaporthe phaseolorum var. caulivora in Argentina
Authors:Pioli, R.N., Morandi, E.N., Bisaro, V.
Source:Plant Dis. 2001, 85(1):95-95
Abstract:In 1997, a soyabean stem canker (SSC) outbreak caused by Diaporthe phaseolorum var. meridionalis was reported in Sante Fe, Argentina. In 1999, an isolate morphologically distinct from D. phaseolorum var. meridionalis was isolated from stems of soyabean plants in Santa Fe exhibiting SSC symptoms. This isolate was identified as D. phaseolorum var. caulivora. A principal component analysis was conducted to compare morphological characters of D. phaseolorum var. caulivora with previously identified isolates (D. phaseolorum var. meridionalis, D. phaseolorum var. sojae and Phomopsis longicolla). The development of perithecia and low frequency stromata in SSC-producing isolates (D. phaseolorum var. caulivora and D. phaseolorum var. meridionalis) were the principal characters that distinguished them from non-SSC-producing isolates (D. phaseolorum var. sojae and P. longicolla). D. phaseolorum var. caulivora had more compact and tufted mycelia and shorter asci length than D. phasolorum var. meridionalis. Pathogenicity trials were conducted by inoculating D. phaseolorum var. caulivora in hypocotyls of soyabean seedlings. SSC symptoms were evident in susceptible plants. This is the first report of D. phaseolorum var. caulivora in Argentina, and possibly the first report in all South America.






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