Horned treehopper

The horned treehopper (Centrotus cornutus) is a member of the Membracidae family within the order Hemiptera. It is easily identified by the unique, horn-like projection on its pronotum, which provides excellent camouflage against thorns or twigs, helping it evade detection by predators.

This species is a known polyphagous pest, meaning it feeds on a wide range of host plants. It is particularly problematic in orchards, where it affects various fruit trees such as apple, pear, and plum, as well as several deciduous forest trees including oaks and willows.

The life cycle of the horned treehopper involves incomplete metamorphosis. The insect typically overwinters as larvae, hiding in bark crevices or under leaf litter. As spring temperatures rise, the larvae emerge to feed, eventually molting into adults by early summer. Adults then mate and lay eggs directly into the bark of young shoots.

The damage caused by these pests primarily stems from their feeding behavior. Using piercing-sucking mouthparts, they extract sap from young twigs, which can lead to stunted shoot growth, tissue necrosis, and bark cracking. While individual damage might seem minor, heavy infestations can significantly weaken younger trees.

Effective management strategies require a combination of preventative and corrective measures. These include maintaining tree vigor through proper pruning, manually removing eggs located in the bark during the dormant season, and applying systemic insecticides when larval activity is at its peak to ensure the protection of the growing season's crop.