This pest is controlled in mid- to late August. For best results, thoroughly cover the trunk with insecticide. Major Pecan Pests Pecans are extremely vulnerable to insect pests. Major pecan pests can be divided into two groups-those that feed on foliage and those that feed on nuts. The timing of pesticide applications is extremely important if pecans are to be protected from these pests.
Obscure scale can cause severe damage to pecans.
It is a small pest which attaches itself to small limbs and sucks juice from the tree. Phylloxera are small, aphid-like pests that cause galls to develop on leaves and petioles early in the growing season. They are a common problem on pecan trees. Pecan Nut Casebearers. The pecan nut casebearer is the larva of a small moth.