Dark leaf spot (Alternaria brassicicola) on Chinese cabbage: spatial patterns
L. Y. Chen A C , T. V. Price A and M. J. Silvapulle BA School of Agriculture, La Trobe University, Bundoora, Vic. 3083, Australia.
B Department of Statistics, La Trobe University, Bundoora, Vic. 3083, Australia.
C Corresponding author; current address: Grasslands Research Centre, AgResearch, Private Bag 11008, Palmerston North, New Zealand. Email: li-yuan.chen@agresearch.co.nz
Australian Journal of Agricultural Research 56(7) 699-714 https://doi.org/10.1071/AR04170
Submitted: 19 July 2004 Accepted: 12 May 2005 Published: 22 July 2005
Abstract
The spatial spread of dark leaf spot caused by Alternaria brassicicola on Chinese cabbage was characterised over 2 years. The study was conducted in 2 field trials using ordinary runs, mapping, spatial autocorrelation, and 2-dimensional distance class analyses. Diseased plants were generally clustered and cluster orientation coincided with the line of inoculation. Disease spread was greater within than across rows. The maximum number of spatial lags with significantly positive autocorrelations occurred when disease incidence levels reached 20–80% in summer 1993–94. Core cluster size generally increased with disease incidence. Two-dimensional distance class analysis was the best analytical method among those used in describing spatial spread of the disease as it did not only provide maximum information but also considered missing data.
Additional key word: s: disease spread, epidemiology, spatial analysis.
Acknowledgments
This project was partly funded by a La Trobe University Postgraduate Research Scholarship, La Trobe University, and an Overseas Postgraduate Research Scholarship, Department of Employment, Education and Training, Australia. AgResearch New Zealand facilitated the publication of this paper.
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