The role of conidia in the dispersal of Ascochyta rabiei
Article
Article Title | The role of conidia in the dispersal of Ascochyta rabiei |
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ERA Journal ID | 2587 |
Article Category | Article |
Authors | Khaliq, Ihsanul (Author), Fanning, Joshua (Author), Melloy, Paul (Author), Galloway, Jean (Author), Moore, Kevin (Author), Burrell, Daniel (Author) and Sparks, Adam H. (Author) |
Journal Title | European Journal of Plant Pathology |
Journal Citation | 158 (4), pp. 911-924 |
Number of Pages | 14 |
Year | 2020 |
Publisher | Springer |
Place of Publication | Netherlands |
ISSN | 0929-1873 |
1573-8469 | |
Digital Object Identifier (DOI) | https://doi.org/10.1007/s10658-020-02126-2 |
Web Address (URL) | https://link.springer.com/article/10.1007%2Fs10658-020-02126-2 |
Abstract | Ascochyta rabiei asexual spores (conidia) were assumed to spread over short distances (~10 m) in a combination of rain and strong wind. The potential distance of conidial spread was investigated in three rainfall and three sprinkler irrigation events. Chickpea trap plants were distributed at the distances of 0, 10, 25, 50 and 75 m from infected chickpea plots before scheduled irrigation and forecast rainfall events. Trap plants were transferred to a controlled temperature room (20 °C) for 48 h (100% humidity) after being exposed in the field for 2–6 days for rainfall events, and for 1 day for irrigation events. After a 48 h incubation period, trap plants were transferred to a glasshouse (20 °C) to allow lesion development. Lesions on all plant parts were counted after 2 weeks, which gave an estimate of the number of conidia released and the distance travelled. Trap plants at all distances were infected in all sprinkler irrigation and rainfall events. The highest number of lesions on trap plants were recorded closest to the infected plots –the numbers decreased as the distance from the infected plots increased. There was a significant (p < 0.05) relationship between the amount of rainfall and the number of lesions recorded. A generalised additive model was developed that efficiently described spatial patterns of conidial spread. With further development, the model can be used to predict the spread of A. rabiei. This is the first systematic study to show that conidia distribute A. rabiei over longer distances than previously reported. |
Keywords | Ascochyta blight; Chickpea; Conidial spread; Epidemiology; Sprinkler irrigation; Wind-driven rain |
ANZSRC Field of Research 2020 | 300409. Crop and pasture protection (incl. pests, diseases and weeds) |
Byline Affiliations | Centre for Crop Health |
Agriculture Victoria | |
Department of Primary Industries and Regional Development, Western Australia | |
Department of Primary Industries, New South Wales | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6119/the-role-of-conidia-in-the-dispersal-of-ascochyta-rabiei
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