Document Detail

Spatial and Temporal Analyses of Bacterial Blight of Onion Caused by Xanthomonas axonopodis pv. allii.
MedLine Citation:
PMID:  18943536     Owner:  NLM     Status:  In-Data-Review    
ABSTRACT Bacterial blight of onion is a severe disease, which emerged over the past decade in several onion-producing areas. This disease currently is observed in both the Old and New Worlds. Although the causative agent, Xanthomonas axonopodis pv. allii, is potentially seedborne, seed transmission and significance of seedborne initial inoculum for the development of bacterial blight of onion previously has not been assessed. This article describes experimental work designed to evaluate the biological importance of seedborne X. axonopodis pv. allii as an initial inoculum source, and examine the temporal and spatial dynamics of the disease. Over 3 years, outbreaks of bacterial blight of onion always were induced in experimental plots sown with naturally contaminated seed lots, with a contamination rate determined as 0.04%. Analyses of disease patterns indicated a likely seedborne origin for the inoculum associated with the early stages of epidemics. Spatial analyses performed with several statistical methods indicated aggregated patterns of disease incidence data. Primary foci enlarged over time, and a few distinct secondary foci sometimes were established after occurrence of wind-driven rains (with gusts up to 15 m s(-1)). Distances between primary and secondary foci ranged from less than 1 m (satellite foci) to 25 m. It remains possible that longdistance dispersal of inoculum was at least partly involved in the later stages of epidemics.
P Roumagnac; O Pruvost; F Chiroleu; G Hughes
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Phytopathology     Volume:  94     ISSN:  0031-949X     ISO Abbreviation:  Phytopathology     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2008-10-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9427222     Medline TA:  Phytopathology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  138-46     Citation Subset:  -    
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