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The role of seedling infection in epiphytotics of ascochyta blight on chickpea
Year:
2007
Authors :
Shtienberg, Dan
;
.
Volume :
117
Co-Authors:
Kimber, R.B.E., School of Agriculture, Food and Wine, University of Adelaide, Waite Campus, Glen Osmond, SA 5064, Australia, South Australian Research and Development Institute (SARDI), GPO Box 397, Adelaide, SA 5001, Australia
Shtienberg, D., Department of Plant Pathology, Agricultural Research Organisation, Volcani Center, P.O. Box 6, Bet-Dagan 50250, Israel
Ramsey, M.D., Animal and Plant Control Commission, GPO Box 2834, Adelaide, SA 5001, Australia
Scott, E.S., School of Agriculture, Food and Wine, University of Adelaide, Waite Campus, Glen Osmond, SA 5064, Australia
Facilitators :
From page:
141
To page:
152
(
Total pages:
12
)
Abstract:
Didymella rabiei, the causal agent of ascochyta blight, survives on infected seeds and seedlings. Diseased seedlings originating from infected seeds occasionally serve as the source for primary infection in chickpea crops. Experiments carried out independently in Australia and in Israel provided quantitative information on the temporal and spatial distribution of ascochyta blight from initial infections and on the relationship between the amount of initial infection and the intensity of subsequent epiphytotics for cultivars differing in susceptibility to the pathogen. Disease spread over short distances (<10 m) from individual primary infections, was governed by rain and wind, and was up to five times greater down-wind than up-wind. Cultivar response to D. rabiei significantly affected the distance and area over which disease spread and the intensity of the disease on infected plants. At onset of the epiphytotic, the relationship between disease spread and time was exponential (P < 0.05; R 2 > 0.95) and the area of the resulting foci was over 10 times greater in susceptible cultivars than in resistant cultivars. Regression equations showed the relationship between disease severity and the distance from the focus-plants was inverse-linear for all cultivars tested (P < 0.05). A simulation model based on the experimental data revealed that even if primary infection is infrequent (less than 1% of plants), the consequences are potentially devastating when susceptible cultivars are used. The epidemiological information and simulation model generated by this study provide an increased understanding of the development of an epiphytotic in which the primary foci of disease originate from infected chickpea seedlings. © 2006 Springer Science + Business Media B.V.
Note:
Related Files :
Ascochyta
Ascochyta rabiei
Australia
Cicer arietinum
crop plant
Gram blight
Israel
Quantitative epidemiology
regression analysis
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Related Content
More details
DOI :
10.1007/s10658-006-9080-x
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
28732
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:41
Scientific Publication
The role of seedling infection in epiphytotics of ascochyta blight on chickpea
117
Kimber, R.B.E., School of Agriculture, Food and Wine, University of Adelaide, Waite Campus, Glen Osmond, SA 5064, Australia, South Australian Research and Development Institute (SARDI), GPO Box 397, Adelaide, SA 5001, Australia
Shtienberg, D., Department of Plant Pathology, Agricultural Research Organisation, Volcani Center, P.O. Box 6, Bet-Dagan 50250, Israel
Ramsey, M.D., Animal and Plant Control Commission, GPO Box 2834, Adelaide, SA 5001, Australia
Scott, E.S., School of Agriculture, Food and Wine, University of Adelaide, Waite Campus, Glen Osmond, SA 5064, Australia
The role of seedling infection in epiphytotics of ascochyta blight on chickpea
Didymella rabiei, the causal agent of ascochyta blight, survives on infected seeds and seedlings. Diseased seedlings originating from infected seeds occasionally serve as the source for primary infection in chickpea crops. Experiments carried out independently in Australia and in Israel provided quantitative information on the temporal and spatial distribution of ascochyta blight from initial infections and on the relationship between the amount of initial infection and the intensity of subsequent epiphytotics for cultivars differing in susceptibility to the pathogen. Disease spread over short distances (<10 m) from individual primary infections, was governed by rain and wind, and was up to five times greater down-wind than up-wind. Cultivar response to D. rabiei significantly affected the distance and area over which disease spread and the intensity of the disease on infected plants. At onset of the epiphytotic, the relationship between disease spread and time was exponential (P < 0.05; R 2 > 0.95) and the area of the resulting foci was over 10 times greater in susceptible cultivars than in resistant cultivars. Regression equations showed the relationship between disease severity and the distance from the focus-plants was inverse-linear for all cultivars tested (P < 0.05). A simulation model based on the experimental data revealed that even if primary infection is infrequent (less than 1% of plants), the consequences are potentially devastating when susceptible cultivars are used. The epidemiological information and simulation model generated by this study provide an increased understanding of the development of an epiphytotic in which the primary foci of disease originate from infected chickpea seedlings. © 2006 Springer Science + Business Media B.V.
Scientific Publication
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