@ARTICLE{TreeBASE2Ref22655, author = {Yupin Li and Mingpei You and Martin John Barbetti}, title = {New Species of Pythium Associated with Seedling Root and Hypocotyl Disease on Common Bean (Phaseolus vulgaris) in Australia}, year = {2013}, keywords = {Pythiun, root disease, hypocotyl disease}, doi = {}, url = {http://}, pmid = {}, journal = {Plant Disease}, volume = {}, number = {}, pages = {}, abstract = {The occurrence and distribution of Pythium spp. were determined by collecting isolates of Pythium from common bean (Phaseolus vulgaris) plants showing root and/or hypocotyl disease symptoms from different areas of Western Australia in 2012. Eight different Pythium species, viz., P. irregulare, P. conidiophorum, P. intermedium, P. lutarium, P. mamillatum, P. perplexum, P. pachycaule and P. diclinum, were isolated and identified according to molecular sequences. P. irregulare was the most widespread Pythium spp. All species, except P. perplexum, were pathogenic to common bean. We believe this is the first report of P. intermedium as a pathogen on common bean worldwide. This is also the first report of P. conidiophorum, P. intermedium, P. lutarium, P. mamillatum, P. pachycaule and P. diclinum as a pathogen on common bean in Australia and the first report of P. irregulare as a pathogen on common bean in Western Australia. P. intermedium was the most pathogenic species, causing the most severe disease on varieties Gourmet Delight [Percent Root Disease Index (%RDI) 75; Percent Hypocotyl Disease Index (%HDI) 59.2] and Pioneer (%RDI 75, %HDI 65.8).That the susceptibility or resistance of a given bean variety to one Pythium spp. was similar across the other Pythium spp. was an important finding, as this opens up opportunities to utilize a single virulent isolate of one Pythium sp. to identify general resistance to a wider spectrum of Pythium spp.} }

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