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

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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.

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Article Link: http://dx.doi.org/10.1111/j.1365-3059.2007.01819.x

Publisher URL: http://www3.interscience.wiley.com/cgi-bin/home


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.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science , Plant Science
Business groups:Crop and Food Science
Additional Information:© Department of Primary Industries and Fisheries. © British Society for Plant Pathology.
Keywords:Hybrid sorghum production; Sorghum bicolor; spore trapping; weather related spore release.
Subjects:Agriculture > Agriculture (General) > Agricultural meteorology. Crops and climate
Plant pests and diseases > Individual or types of plants or trees > Sorghum
Plant pests and diseases > Plant pathology
Live Archive:03 Feb 2009 06:07
Last Modified:03 Sep 2021 16:43

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