Tricolored knot-horn moth

Systematic position: Acrobasis tricolorella belongs to the order Lepidoptera, family Pyralidae. It is a well-known pest within agricultural entomology, specifically targeting various fruit-bearing woody plants, often causing economic losses in orchards.

Host plants: The species primarily infests plants in the Rosaceae family. It is most commonly found on apple, pear, and plum trees. The larvae are specialists that thrive by feeding on the buds, foliage, and developing blossoms of these specific fruit trees.

Biology and life cycle: The life cycle includes egg, larval, pupal, and adult stages. The larvae overwinter in silk hibernacula situated in bark crevices or near bud scales. As spring temperatures rise and sap begins to flow, the larvae emerge to feed on the swelling buds, completing their development before pupating in protected areas.

Nature of damage: Damage is most evident during the early spring when larvae tunnel into buds, effectively killing them before they can leaf out or bloom. Later in the season, larvae may roll leaves together with silk and feed within these nests, significantly reducing the tree's photosynthetic capacity and causing fruit set failure.

Protection measures: Effective management requires a combination of cultural and chemical strategies. Early spring dormant oil applications or targeted insecticide sprays are crucial for controlling the overwintered larval population. Recommended practices include:

• Scraping and removing rough, infested bark.
• Sanitary pruning of infested shoots and webbed leaf clusters.
• Encouraging natural predators such as parasitic wasps and birds.
• Monitoring adult flight with pheromone traps for precise spray timing.