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Characterizaton of the spatiotemporal attributes of sclerotinia flower blight epidemics in a perennial pyrethrum pathosystem
Citation
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
Abstract
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 â-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 and Veterinary Sciences |
| Research Group: | Crop and Pasture Production |
| Research Field: | Crop and Pasture Protection (Pests, Diseases and Weeds) |
| Objective Division: | Plant Production and Plant Primary Products |
| Objective Group: | Industrial Crops |
| Objective Field: | Plant Extract Crops (e.g. Pyrethrum, Jojoba) |
| 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: | 12 |
| Deposited By: | Agricultural Science |
| Deposited On: | 2011-01-28 |
| Last Modified: | 2012-08-03 |
| Downloads: | 0 |
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