The pear psylla, Cacopsylla pyricola (Foerster), is an economically important pest of pears. The sex attraction of the multivoltine C. pyricola was tested in the field during the summer of 2006 (summerforms) and late winter of 2007 (winterforms). Traps were baited with live female psylla, live males, or no psylla and monitored for 4-7 days. Trapping results demonstrated a clear preference by males to traps baited with live females over unbaited traps or traps baited with live males, in both summer and winter tests. Female C. pyricola did not demonstrate a preference among the three types of traps in either experiment. In the summer of 2007, the diel periodicity of male preference was monitored every two hours from 6:45 am to 8:45 pm for three consecutive days. The traps were either baited with live females or left unbaited. Male C. pyricola preferred the female-baited traps at all time intervals, with catches peaking between the 2:45 and 4:45 pm time periods.