The pear psyllid hibernates as an adult. Early in the year this small pest becomes active. As soon as the average temperature is over 10° C for two successive days, mating takes place and the pear psyllid begins to lay its eggs. This usually takes place in March. In April, the first larval stages are present in the crop. There are 5 larval stages and each year 3 to 4 generations of the pear psyllid develop. Climate (especially temperature) plays an important role in the development rate. At an average temperature of 10° C, the pear psyllid takes almost 100 days to complete its life cycle. At an average temperature of 23° C, development takes only a month. Eggs are 0.3 mm long and change from white to yellow to orange. Larvae are orange-red to brown-black. As they age, larvae become less mobile and secrete more honeydew. After the 5th larval stage the pear psyllid sheds its skin and the 3mm, brown-black, winged imago is formed.