Oak aphid

Systematic position: This pest belongs to the order Hemiptera and the family Thelaxidae. It is a highly specialized species that has co-evolved with oak trees, making it a significant biotic factor in the development of young shoots and foliage within the Quercus genus.

Host plants: The primary hosts are various species of oak, particularly the cork oak and common oak. The pest is predominantly found in areas with temperate and Mediterranean climates, often colonizing ornamental and forest trees alike.

Biology and life cycle: Thelaxes suberi typically undergoes several generations per year. The insects cluster on young stems and the underside of leaves to feed. The lifecycle is synchronized with the phenology of the host plant, with overwintering occurring in the egg stage, secured within the crevices of the tree bark.

Damage and severity: The primary damage is caused by the aphid's feeding activity, which drains sap and induces chlorosis, leaf curling, and stunted growth. The honeydew excreted by the aphids provides a medium for sooty mold growth, which inhibits photosynthesis and negatively affects the tree's overall vigor.

Control measures: Management strategies rely on early detection and integrated pest management (IPM) practices. Maintaining tree vitality through proper fertilization and watering is the first line of defense. When necessary, chemical control using systemic or contact insecticides is implemented during the critical phases of aphid population growth.

• Conducting routine surveys during the spring budding period.
• Encouraging natural predators such as ladybirds and lacewings in the ecosystem.
• Applying targeted insecticidal treatments to prevent significant foliage loss.