Brown-winged knothorn

The brown-winged knothorn (Pammene germarana) is a moth belonging to the family Tortricidae. It is a significant pest primarily affecting pome fruit orchards, with its distribution often overlapping with major commercial apple-growing regions.

The species primarily attacks apple trees, though it can occasionally be found on other related tree species. The economic impact is substantial as the pest directly damages the fruit, rendering it unmarketable and susceptible to rot during storage and distribution.

The life cycle of Pammene germarana includes several developmental stages: egg, larva, pupa, and adult moth. Adult moths emerge in the spring to lay eggs on the fruit surface. Once hatched, the larvae bore into the apple, creating tunnels that destroy the interior tissue and reach the core.

Larval feeding causes the fruit to ripen prematurely and drop to the ground. Visible signs of infestation include small entry holes and larval frass, often found around the stem or near the calyx of the fruit. This damage pattern makes the fruit unsuitable for human consumption or processing.

• Monitoring adult flight activity using pheromone traps.
• Sanitation by removing and destroying fallen, infested fruit.
• Targeted insecticide applications during the larval emergence window.
• Promoting natural predators in the orchard ecosystem.

Effective management requires a well-timed pest control strategy. By integrating pheromone monitoring with judicious chemical applications, growers can significantly reduce the population of Pammene germarana and protect the yield from the devastating effects of larval feeding.