“…However, it has also been widely used to improve fruit setting, prevent premature fruit drop, increase fruit size and reduce the need for tree pruning in top fruit, mainly pears. CMQ residues may be monitored by mass spectrometry/liquid chromatography [7 -10] or liquid chromatography/tandem mass spectrometry [11], thin layer chromatography [12], conductometric detection coupled to ion chromatography [13,14], indirect UV detection coupled to electrophoresis [15,16], voltammetry [17] and potentiometry [18,19] methods.…”