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Mean number of psyllids (B. trigonica + B. nigricornis) collected per sweep in 2016 (grey circles and solid line) and 2017 (black triangles and dashed line). Samples were collected in carrot fields, (a) Gomezserracín, (b) Íscar, (c) Villena or in potato fields, (d) Aldearrubia and (e) Gomezserracín. Y-axis values represent the mean number of insects per sweep and X-axis represents collecting dates.
