The Pecan Nut Casebearer is one of the most important nut infesting insect pests for pecans. The Pecan Nut Casebearer completes two to four generations per year with the first generation having the greatest potential for damage. Adults of the overwintering generation emerge in April and lay eggs on the nutlets soon after pollination.
The best way to determine when or if to spray for the casebearer is to scout for eggs. Most casebearer eggs are found at the tip of the nutlet, either on top of or just under the tiny leaves called sepals. A good hand lens is necessary to identify casebearer eggs and determine their development. The eggs are white when laid and turn pink as they near hatching. Also look just below the nut cluster to detect the presence of newly hatched larvae.
Scouting for casebearer eggs should be taking place right now. Depending on the pecan nut load, usually around 5% nut entry warrants an application of insecticide. However, if trees are really loaded, spraying may not be necessary for light casebearer infestations.
