Identification and Characterization of Russet on Snap Beans Caused by Plectosporium tabacinum

Russet symptoms of unknown etiology are sporadically observed on snap bean (Phaseolus vulgaris) pods in New York and Maryland. Symptoms can render the whole crop unmarketable, and seem to appear when heavy rainfall occurs around harvest time. In 2000 and 2004, a microorganism not previously encounte...

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Veröffentlicht in:Plant disease. - 1997. - 89(2005), 7 vom: 02. Juli, Seite 700-704
1. Verfasser: Dillard, H R (VerfasserIn)
Weitere Verfasser: Cobb, A C, Shah, D A, Straight, K E
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2005
Zugriff auf das übergeordnete Werk:Plant disease
Schlagworte:Journal Article
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520 |a Russet symptoms of unknown etiology are sporadically observed on snap bean (Phaseolus vulgaris) pods in New York and Maryland. Symptoms can render the whole crop unmarketable, and seem to appear when heavy rainfall occurs around harvest time. In 2000 and 2004, a microorganism not previously encountered was isolated from russet lesions on snap bean pods from commercial fields in Maryland and New York. Typical russet symptoms were produced on snap bean pods of cv. Brio after inoculation with spores of the isolates. Koch's postulates were also fulfilled. The organism was identified as Plectosporium tabacinum (Van Beyma) M.E. Palm, W. Gams & Nirenberg. A continuous 48-h leaf wetness duration at 23 to 27°C was essential for rapid symptom development. Large (11 cm long on average) snap bean pods were more susceptible to disease than smaller (pin) pods in cvs. Brio and Gold Mine. Light mechanical damage to the pods did not enhance infection. Four isolates of P. tabacinum (three from snap bean pods, one from zucchini) were inoculated onto large pods of the snap bean cvs. Brio, Gold Mine, and Hercules. All four isolates induced a russet on the pods, but the severity was significantly lower with the zucchini isolate 
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700 1 |a Shah, D A  |e verfasserin  |4 aut 
700 1 |a Straight, K E  |e verfasserin  |4 aut 
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