| Abstract Detail
Production and Management Estrada, Rolando [1], Rivera, Viviana [1], Secor, Gary [1]. Comparative pathogenicity of Fusarium graminearum isolates to potato, sugarbeet and wheat. FUSARIUM species are among the most important plant pathogens world wide, primarily because of the wide variety of hosts affected by one or more species of this fungus, making it important in virtually every crop grown. Recently, Fusarium graminearum was isolated from potato tubers with typical dry rot symptoms from commercial storage facilities in North Dakota and Minnesota, as well as from a limited number of stored sugar beets. The objective of this study was to determine the host range and pathogenicity of F. graminearum isolates from potatoes, sugarbeet, and wheat. Twenty isolates from potato, five from sugar beets, and ten from wheat were used to test cross pathogenicity. Potatoes and sugar beets were inoculated by removing a plug from the tuber/root and replacing it with a seven day old actively growing mycelial plug of the fungus and incubated in a moist chamber at 14°C for four weeks. Wheat plants were inoculated at anthesis by spraying each head with a conidial suspension (macroconidia ~ 40,000 spores/ml), then incubated in moist chambers for 48 hours and maintaining in the greenhouse for three weeks. Potato tuber and sugarbeet infections were estimated by measuring both the width of the tuber or beet, as well as the depth of the dry rot lesions, to obtain an infection ratio. Infection in wheat was determined using a visual scale of severity for Fusarium Head Blight (FHB). Cross pathogenicity occurred with each isolate on every crop. Typical FHB symptoms were seen in wheat inoculated with potato, sugarbeet, and wheat isolates. Potatoes and sugar beets showed typical dry rot symptoms regardless of isolate origin. The mechanism of the change in host specificity is still unknown. These results have major epidemiological implications for crop rotations.
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Related Links:
First report of Fusarium graminearum causing dry rot in potato
1 - North Dakota State University, Department of Plant Pathology, 306 Walster Hall, Fargo, ND, 58105, USA
Keywords:
Pathogenicity of Fusarium graminearum
potato dry rot.
Session: PAA12-11
Location: Hall of Ideas Room E/Monona Terrace
Date: Tuesday, July 25th, 2006
Time: 11:30 AM
Abstract ID:82 |
