Patterns of release of the secondary conidia of Claviceps africana, the sorghum ergot pathogen in Australia
Article
Article Title | Patterns of release of the secondary conidia of Claviceps africana, the sorghum ergot pathogen in Australia |
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ERA Journal ID | 2652 |
Article Category | Article |
Authors | Ryley, M. J. (Author) and Chakraborty, S. (Author) |
Journal Title | Plant Pathology |
Journal Citation | 57 (3), pp. 473-483 |
Number of Pages | 11 |
Year | 2008 |
Publisher | John Wiley & Sons |
Place of Publication | Chichester, West Sussex. United Kingdom |
ISSN | 0032-0862 |
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. |
Keywords | hybrid sorghum production; sorghum bicolor; spore-trapping; weather-related spore release |
ANZSRC Field of Research 2020 | 310407. 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 Affiliations | Department of Primary Industries and Fisheries, Queensland |
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q26ww/patterns-of-release-of-the-secondary-conidia-of-claviceps-africana-the-sorghum-ergot-pathogen-in-australia
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