Sea buckthorn aphid

Systematic position: The sea buckthorn aphid (Capitophorus hippophaes) is a member of the Hemiptera order and the Aphididae family. It is a migratory aphid species known for its complex life cycle, which involves rotating between specific primary and secondary host plants to ensure its survival throughout the year.

Host plants: The primary host is the sea buckthorn (Hippophae rhamnoides). During the summer months, the aphids migrate to secondary hosts, with tomatoes being the most economically impacted crop. Other alternative hosts include various species of Polygonaceae, such as knotweed, which act as reservoirs for the population.

Biology and life cycle: The insect overwinters in the egg stage on the bark of sea buckthorn. In the spring, fundatrices hatch and begin colonizing the host. Once the population density increases, winged forms develop and migrate to secondary hosts like tomatoes, where they reproduce rapidly during the summer. By autumn, winged migrants return to the primary host to lay overwintering eggs.

Nature of damage and harmfulness: The aphids feed on plant sap by piercing the tissues of leaves and tender shoots. This activity leads to leaf curling, stunted development, and reduced photosynthetic efficiency. More critically, Capitophorus hippophaes serves as a vector for various plant viruses, causing systemic infections that can lead to significant crop yield loss.

Control measures: Management requires a multi-faceted approach to limit the aphid's spread and impact:

• Cultural practices, including the removal of reservoir weeds like knotweed near cultivated fields.
• Chemical control using systemic insecticides applied during the peak migration periods.
• Biological control through the encouragement of natural predators like ladybirds and lacewings.
• Use of yellow sticky traps for population monitoring and early detection.