This morning we found 1.67% of our pecan clusters with pecan nut casebearer damage (photo at right). You can identify casebearer damage by the pile of brown frass at the base of the nut and the appearance of fine webbing between nut and peduncle.
It usually takes 2-3 nuts to satisfy the hunger of just one insect. Damage levels will peak in 7 to 10 days after first entry. If you plan on controlling this pest, you will need to spray before damage levels hit 5% cluster infestation.