Birch aphid

Systematic position: The birch aphid (Glyphina betulae) belongs to the order Hemiptera and the family Aphididae. It is a specialized insect species that has co-evolved with birch trees, developing specific mechanisms to exploit its host's sap resources.

Host plants: The pest primarily targets various species of the genus Betula (birch). It is frequently found on young shoots and the undersides of leaves, posing a particular threat to young trees in nurseries and urban landscapes where environmental stress may be present.

Biology and lifecycle: The lifecycle follows a complex pattern, starting from eggs that overwinter within bark crevices. As temperatures rise in spring, nymphs emerge to begin feeding. The species reproduces parthenogenetically during the summer months, leading to rapid population growth and the emergence of winged forms that facilitate dispersal to adjacent hosts.

Damage and pest status: Feeding by Glyphina betulae causes localized damage such as leaf curling, chlorosis, and stunted growth of shoots. Beyond direct damage, the excretion of honeydew promotes the growth of sooty mold, which blocks sunlight and hinders photosynthesis, significantly reducing the vigor of the infested tree.

Control measures: Management strategies involve a combination of biological and chemical approaches.

• Monitoring trees in early spring to detect initial colonization.
• Applying systemic insecticides when threshold levels are reached.
• Encouraging natural predators such as ladybirds, lacewings, and hoverflies.
• Maintaining tree health through proper irrigation and fertilization.