Pecan nut casebearer

Systematic position: Acrobasis demotella belongs to the order Lepidoptera, family Pyralidae (snout moths). It is recognized as a significant pest in commercial pecan orchards, where it can severely impact the quantity and quality of the nut harvest if not managed correctly during the early growth stages.

Host plants: The primary host for this species is the pecan tree (Carya illinoinensis). The larvae are capable of feeding on various parts of the host plant, demonstrating a preference for succulent tissues like young buds, emerging shoots, and developing nutlets, which makes them highly destructive in managed orchards.

Biology and life cycle: The insect typically overwinters as a larva in a protected hibernaculum on the tree branches. As the tree breaks dormancy in spring, the larvae emerge to feed on developing buds. They undergo several larval instars, causing visible damage to the canopy before pupating and completing their life cycle as adult moths.

Damage patterns and economic importance: The primary injury occurs when larvae bore into the tips of tender shoots or into the developing nuts. Shoot damage leads to dieback and reduced terminal growth. Nut damage is particularly serious, as the entry of the larvae into the young nuts leads to premature fruit drop and direct yield loss.

Protection measures: Integrated Pest Management (IPM) for this pest relies on monitoring with pheromone traps to time insecticide applications accurately. Spraying during the initial larval emergence is critical.

• Regular field scouting.
• Timely application of selective insecticides.
• Removal of damaged terminal growth.
• Maintaining healthy tree vigor to withstand minor infestations.