Spatial and spatiotemporal (ST) patterns of citrus canker were examined in three nurseries and two groves in Argentina. The center plant in each plot was inoculated with Xanthomonas campestris pv. citri, and disease was allowed to progress for two growing seasons. Disease assessments were made at about 21-day intervals. Final disease incidence was >90% in all three nurseries and reached 69 and 89% for orange (Citrus sinensis) and grapefruit (C.X paradisi groves, respectively. For nursery plots, each quadrat was represented by disease counts, i.e., the number of diseased leaves, in a six-plant row segment (...)
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T. R. Gottwald (1992) studied this question.