Spatiotemporal development of Ascochyta blight in chickpea from primary infection foci: insights from plant, pathogen and the environment interactions to inform an epidemic risk

Article


Khaliq, Ihsanul. 2021. "Spatiotemporal development of Ascochyta blight in chickpea from primary infection foci: insights from plant, pathogen and the environment interactions to inform an epidemic risk." European Journal of Plant Pathology. 161 (2), pp. 331-342. https://doi.org/10.1007/s10658-021-02324-6
Article Title

Spatiotemporal development of Ascochyta blight in chickpea from primary infection foci: insights from plant, pathogen and the environment interactions to inform an epidemic risk

ERA Journal ID2587
Article CategoryArticle
Authors
AnimatorKhaliq, Ihsanul
Journal TitleEuropean Journal of Plant Pathology
Journal Citation161 (2), pp. 331-342
Number of Pages12
Year2021
PublisherSpringer
Place of PublicationNetherlands
ISSN0929-1873
1573-8469
Digital Object Identifier (DOI)https://doi.org/10.1007/s10658-021-02324-6
Web Address (URL)https://link.springer.com/article/10.1007%2Fs10658-021-02324-6
Abstract

Ascochyta blight epidemics have been observed in many countries since the early 1900s but studies on an interaction between the amount of inoculum, environmental factors and the spatiotemporal development of Ascochyta blight are rare due to the historic emphasis on developing resistant cultivars and chemical control of the disease. I used generalised linear mixed models to investigate key environmental factors affecting the spatiotemporal development of Ascochyta blight from primary infection foci. Briefly, four replicate plots (20 m x 20 m) of a susceptible chickpea cultivar were planted at two different locations (Billa Billa and Tosari) in Queensland, Australia. Four naturally infested stubble pieces were placed at the centre of each newly emerged chickpea plot 14 days after sowing. The number of infected plants was counted in 1 m(2) observation quadrats at the distances of 3, 6 and 9 m in a concentric arrangement. The number of infected plants increased with each assessment date, approaching 100% plant infections at the time of final assessment. The rate of disease progress was significantly faster at Tosari. The rate of disease progress significantly decreased as the distance from the primary infection foci increased. There was a significant positive effect of an optimum temperature, increasing rainfall and omni-directional wind. The influence of wind speed was not significant. The finding that single infection foci were enough to spread disease across whole plots indicate that limited inoculum is not a barrier in the development of an epiphytotic under conducive conditions.

KeywordsAscochyta rabiei; Comparative epidemiology; Spatiotemporal development; Ecological processes; Disease ecology; Quantitative epidemiology
ANZSRC Field of Research 2020300409. Crop and pasture protection (incl. pests, diseases and weeds)
Byline AffiliationsCentre for Crop Health
Institution of OriginUniversity of Southern Queensland
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https://research.usq.edu.au/item/q6y7w/spatiotemporal-development-of-ascochyta-blight-in-chickpea-from-primary-infection-foci-insights-from-plant-pathogen-and-the-environment-interactions-to-inform-an-epidemic-risk

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