Eggs are laid from approximately late May to mid July. Females lay between 39 and 202 eggs. The following photograph shows several blackberry psyllid eggs deposited in the folds of a tightly curled blackberry leaf. The nymphs are present from early June to late October, and adults began emerging in early October. Nymphs are also responsible for some leaf distortion and may be found inside curled leaves.
Nymphs secrete several types of waxy structures.
Fruit spurs may be fed upon by blackberry psyllid so that normal fruit fails to develop. In fall, males and females are present in equal numbers but by March, the males have disappeared. The winter relationship with conifers is apparently obligatory. If blackberries are one mile or more from conifers no psyllid damage will be found. I have collected overwintering adults from various locations in Virginia, West Virginia and Pennsylvania.