Fusarium Head Blight Inoculum: Species Prevalence and Gibberella zeae Spore Type

• DOI: 10.1094/pdis.2003.87.7.814
• Publication Date: 2007-05-11T10:21:28Z
• Authors: S. G. Markell; L. J. Francl
• Keywords: Gibberella zeae; Gibberella

The objectives of this study were to examine the relative abundance Gibberella zeae ascospores and conidia other Fusarium species on wheat spikes in a field environment, relate inoculum counts G. airborne spore counts, evaluate an bioassay technique. levels spores measured North Dakota during 1999, 2000, 2001 growing seasons. Spores collected from 24-h potted-plant fallowed spring plot bioassay. Inoculum assessed by placing solution recovered bioassays selective medium; meanwhile, enumerated microscopically. A Burkard cyclonic sampler field. Wheat inoculated with known concentrations or ascospores, rinsate was put medium at different intervals compare recovery rates. Known both types also applied directly spikes. graminearum most prevalent spikes, although F. moniliforme poae highest some days. Approximately twice as many conidia. Significantly more colonies after conidial inoculation than ascospore identical concentration regardless time collection. Colony numbers did not differ significantly following application medium. Results confirm predominance America but indicate play important role primary disease cycle.