Patterns of release of the secondary conidia of Claviceps africana, the sorghum ergot pathogen in Australia

Article


Ryley, M. J. and Chakraborty, S.. 2008. "Patterns of release of the secondary conidia of Claviceps africana, the sorghum ergot pathogen in Australia." Plant Pathology. 57 (3), pp. 473-483. https://doi.org/10.1111/j.1365-3059.2007.01819.x
Article Title

Patterns of release of the secondary conidia of Claviceps africana, the sorghum ergot pathogen in Australia

ERA Journal ID2652
Article CategoryArticle
AuthorsRyley, M. J. (Author) and Chakraborty, S. (Author)
Journal TitlePlant Pathology
Journal Citation57 (3), pp. 473-483
Number of Pages11
Year2008
PublisherJohn Wiley & Sons
Place of PublicationChichester, West Sussex. United Kingdom
ISSN0032-0862
1365-3059
Digital Object Identifier (DOI)https://doi.org/10.1111/j.1365-3059.2007.01819.x
Web Address (URL)http://onlinelibrary.wiley.com/doi/10.1111/j.1365-3059.2007.01819.x/pdf
Abstract

Trials were conducted in southern Queensland, Australia between March and May 2003, 2004 and 2005 to study patterns of hourly and daily release of the secondary conidia of Claviceps africana and their relationships with weather parameters. Conidia were trapped for at least one hour on most (> 90%) days in 2003 and 2004, but only on 55% of days in 2005. Both the highest daily concentration of conidia, and the highest number of hours per day when conidia were trapped, were recorded 1-3 days after rainfall events. Although the pattern of conidial release was different every day, the highest hourly conidial concentrations occurred between 10.00 hours and 17.00 hours on 73% of all days in the three trials. Hours when conidia were trapped were characterized by higher median values of temperature, windspeed and vapour pressure deficit, lower relative humidity, and leaf wetness values of 0%, than hours when no conidia were recorded. The results indicate that fungicides need to be applied to the highly ergot-susceptible male sterile (A-) lines of sorghum in hybrid seed production blocks and breeders' nurseries as soon as possible after rainfall events to minimize ergot severity.

Keywordshybrid sorghum production; sorghum bicolor; spore-trapping; weather-related spore release
ANZSRC Field of Research 2020310407. Host-parasite interactions
310705. Mycology
300409. Crop and pasture protection (incl. pests, diseases and weeds)
Public Notes

© 2008 Department of Primary Industries and Fisheries. Published version deposited in accordance with the copyright policy of the publisher.

Byline AffiliationsDepartment of Primary Industries and Fisheries, Queensland
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia
Institution of OriginUniversity of Southern Queensland
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