Colour preferences of the two most abundant Cacopsylla species in the apricot orchard, C. pruni (A) and C. melanoneura (B). Graphs show the mean numbers of catches by each coloured sticky trap (Y-axis) during the whole observation period. X-axis lists the trap colours. Horizontal bars represent the medians, vertical bars represent the standard error of means. Statistical means are represented by triangles and interquartile ranges are indicated by boxes and outliers (if present) by black dots. Different letters represent significant differences between colours.