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Characterizaton of the spatiotemporal attributes of sclerotinia flower blight epidemics in a perennial pyrethrum pathosystem


Pethybridge, SJ and Hay, FS and Gent, DH, Characterizaton of the spatiotemporal attributes of sclerotinia flower blight epidemics in a perennial pyrethrum pathosystem, Plant Disease, 94, (11) pp. 1305-1313. ISSN 0191-2917 (2010) [Refereed Article]

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Copyright Statement

Copyright 2010 The American Phytopathological Society

DOI: doi:10.1094/PDIS-04-10-0311


Sclerotinia flower blight, caused by Sclerotinia sclerotiorum, causes substantial losses in Australian pyrethrum fields. The spatiotemporal characteristics of epidemics were characterized in five fields over 3 years. Log likelihood tests indicated that the -binomial distribution fit better than the binomial distribution for 92% of the data sets. The index of dispersion, D, was significantly greater than 1 in 97% of the data sets. The estimated parameters of the slope and intercept terms of the binary power law were 1.631 (standard error [SE] = 0.059) and 0.678 (SE = 0.099), indicating a high degree of aggregation at the individual sampling unit scale. In 69% of the data sets, the magnitude of the first-order autocorrelation coefficient , was significantly greater than 0. In 11 of the 12 epidemics, the monomolecular model provided the best fit, indicative of monocyclic processes. A significant spatial association between apothecia and incidence of Sclerotinia flower blight within the lag of one sampling unit was also quantified. This study suggests that S. sclerotiorum apothecia emergence was closely synchronized with flower development, and epidemics were dominated by localized sources of ascosporic inoculums. This research provides the basis for improved management strategies for Sclerotinia flower blight in pyrethrum

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Crop and pasture production
Research Field:Crop and pasture protection (incl. pests, diseases and weeds)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Industrial crops
Objective Field:Plant extract crops
UTAS Author:Pethybridge, SJ (Dr Sarah Pethybridge)
UTAS Author:Hay, FS (Dr Frank Hay)
UTAS Author:Gent, DH (Dr David Gent)
ID Code:66488
Year Published:2010
Funding Support:Australian Research Council (LP0211065)
Web of Science® Times Cited:15
Deposited By:Agricultural Science
Deposited On:2011-01-28
Last Modified:2012-08-03

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