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Total number of psyllids (B. trigonica + B. nigricornis) collected by horizontal green water tile traps 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,d) Villena or in potato fields, (e) Aldearrubia and (f) Gomezserracín.
