Temporal inoculum dynamics for Fusarium head blight of wheat and barley in South Dakota

Fusarium head blight (FHB), caused by Fusarium graminearum (teleomorph: Gibberella zeae), is a major disease of wheat and barley in the Northern Great Plains. Recent studies on the temporal dynamics of FHB inoculum have reported that ascospore levels were found to vary in the atmosphere on a diurnal...

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Bibliographic Details
Published in:Phytopathology 2006-06, Vol.96 (6), p.S88-S88
Main Authors: Osborne, LE, Stein, J M
Format: Article
Language:English
Subjects:
Fusarium graminearum
Gibberella zeae
Hordeum vulgare
Triticum aestivum
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Summary:Fusarium head blight (FHB), caused by Fusarium graminearum (teleomorph: Gibberella zeae), is a major disease of wheat and barley in the Northern Great Plains. Recent studies on the temporal dynamics of FHB inoculum have reported that ascospore levels were found to vary in the atmosphere on a diurnal cycle (either overnight or during midday). Preliminary observations in South Dakota indicated that conidia and ascospores were present throughout the day, occasionally in abundance for up to several days at a time. Spore samplers were placed at three locations in South Dakota during the 2003 and 2004 seasons. Air was continuously sampled for up to three weeks at each location. The first objective was to determine the relative abundance of ascospores and conidia over time. The second objective was to evaluate the inoculum load over time in relation to temperature, relative humidity, vapor pressure, and precipitation. On average, 2.7 ascospores/hr and 1.7 conidia/hr were observed over all locations, although both types were found to have very similar temporal distribution. On average, peaks occurred every three days, although peaks varied in duration and magnitude. It was also observed that when 24 hr moving-average data were considered, inoculum curves tended to lag vapor pressure curves across location-years by about 12-24 hours. Correlation analysis showed that inoculum data lagged several other weather parameters by varying times.
ISSN:0031-949X