Buckthorn aphid

Systematic position. The buckthorn aphid (Aphis frangulae) is a member of the order Hemiptera and the family Aphididae. It is recognized as a significant agricultural pest that exhibits host-alternating behavior, moving between its woody primary host and various herbaceous secondary hosts throughout the growing season.

Host plants. As its common name suggests, the primary host for overwintering is the alder buckthorn (Frangula alnus). During the summer, the aphid migrates to a wide range of economically important crops, including potatoes, cucumbers, zucchinis, pumpkins, and various other vegetables, often causing severe infestations.

Biology and life cycle. The species overwinters as eggs on the twigs of buckthorn plants. In spring, wingless stem mothers hatch and produce several generations. Eventually, winged migrants are produced, which fly to secondary hosts to establish large colonies. By autumn, winged sexual forms return to the primary host, where they mate and deposit eggs that survive the winter.

Damage and economic significance. These aphids feed by piercing plant tissues and extracting sap, which leads to leaf curling, stunted plant growth, and general physiological stress. Beyond the direct damage caused by nutrient loss, the species is a major vector for numerous plant viruses, which often cause more economic damage than the physical feeding of the insects themselves.

Control measures. Integrated pest management (IPM) is crucial for controlling this species effectively.

• Removal of primary host plants (buckthorn) near crop fields.
• Application of selective systemic insecticides during peak infestation periods.
• Conservation of natural predators like ladybirds and lacewings.
• Use of reflective mulches to deter aphid colonization.