| Abstract Detail
Plant Protection Meyer, Jack R. [1], Jacobson, Barry J. [1]. Varietal susceptibility and fungicide control of to black dot root rot. BLACK Dot (Colletotrichum coccodes) is becoming a more important disease concern across the United States. It is involved in the early dying disease complex with Verticillium and nematodes in some locations. Black dot also causes lesions on the tuber surface that resemble those of silver scurf and can result loss of quality. Because there is little data available on the susceptibility of potato cultivars commonly grown in the USA we evaluated thirty-five different cultivars for susceptibility to C. coccodes. Tissue culture derived plantlets from the Montana Potato Lab were planted in pasteurized soil, and in soil infested with 1 x105 cfu of C. coccodes/g soil and grown in the greenhouse at 220C day using 180C night. Over the 60 days cultivars showed stunting and reduced growth of 0% to 31% comparing pasteurized to infested soil. We will report on cfu /g of stem tissue and on the use of realtime pcr to rank cultivars. We will also report on field studies using azxoystrobin (Quadris, Syngenta) soil treatments followed by foliar sprays of chlorothalonil (Bravo, Sygenta) and mancozeb (Manzate 200, Du Pont) applied when plants were 25 cm tall.
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1 - Montana State University, Plant Science and Plant Pathology, 205 AgBioScience Building, Bozeman, Mt, 59717, USA
Keywords:
none specified
Session: PAA02a-6
Location: Hall of Ideas Room E/Monona Terrace
Date: Monday, July 24th, 2006
Time: 2:45 PM
Abstract ID:64 |
