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Effect of climate variability on event frequency of sorghum ergot in Australia

Wang, E. and Ryley, M. and Meinke, H. (2003) Effect of climate variability on event frequency of sorghum ergot in Australia. Australian Journal of Agricultural Research, 54 (6). pp. 599-611.

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Article Link(s): http://dx.doi.org/10.1071/AR02198

Publisher URL: http://www.publish.csiro.au

Abstract

The significant effect of ergot, caused by Claviceps africana, on the Australian sorghum industry, has led to considerable research on the identification of resistant genotypes and on the climatic conditions that are conducive to ergot outbreaks. Here we show that the potential number of monthly ergot events differs strongly from year to year in accordance with ENSO (El Niño–Southern Oscillation)-related climate variability. The analysis is based on long-term weather records from 50 locations throughout the sorghum-growing areas of Australia and predicts the potential number of monthly ergot events based on phases of the Southern Oscillation Index (SOI). For a given location, we found a significant difference in the number of potential ergot events based on SOI phases in the preceding month, with a consistently positive SOI phase providing the greatest risk for the occurrence of ergot for most months and locations. This analysis provides a relative risk assessment for ergot outbreaks based on location and prevailing climatic conditions, thereby assisting in responsive decision-making to reduce the negative effect of sorghum ergot.

Item Type:Article
Business groups:Agri-Science, Crop and Food Science
Additional Information:Reproduced with permission from © CSIRO Publishing. Access to published version may be available via Publisher’s website.
Keywords:El Niño–Southern Oscillation (ENSO); Southern Oscillation Index (SOI); Claviceps africana; ergot.
Subjects:Science > Botany > Cryptogams
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
Deposited On:26 Mar 2004
Last Modified:26 Oct 2011 05:03

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