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Temporal evolution of lavender decline incidence. (A) Mean lavender decline calculated for 19 fields surveyed from spring 2008 to spring 2010. (B) Incidence of lavender decline in each surveyed field. The lavender field code is indicated below the graph, and field characteristics are given in Table 4. Lavender fields are sorted according to cultivars, and fields on the left are those added to the survey to replace fields pulled out in 2008 and 2009.
