Viburnum aphid

Systematic position: The species Ceruraphis eriophori belongs to the order Hemiptera, family Aphididae. It is a migratory aphid species known for its specific host alternation between woody shrubs and herbaceous plants, making it a persistent pest in both garden and natural habitats.

Crops damaged: The primary host is the Viburnum shrub (Viburnum spp.). During the spring and autumn, the aphids thrive on these shrubs. In the summer, the population migrates to intermediate hosts, specifically sedges (Cyperaceae), such as the cotton-grass (Eriophorum), which serves as a refuge until the return flight in the fall.

Biology and life cycle: The winter is spent in the egg stage, with eggs laid near the buds on Viburnum twigs. In early spring, the fundatrices hatch and start rapid asexual reproduction. By summer, winged forms emerge to migrate to sedges. In autumn, a return migration to Viburnum occurs, where sexual reproduction takes place and overwintering eggs are deposited.

Nature of damage and harmfulness: The aphids feed by sucking sap from the undersides of young leaves and shoot tips. This feeding causes the leaves to curl tightly into distorted, reddish, or brownish clusters. Heavily infested shoots exhibit stunted, twisted growth, which significantly reduces the aesthetic value of the shrub and weakens its vitality.

Protection measures: Effective control requires timely intervention, ideally before the leaves begin to curl. Once the leaves are distorted, contact insecticides are less effective, making systemic pesticides a preferred choice. Additionally, maintaining a healthy garden environment and encouraging predatory insects like ladybirds and lacewings can help keep aphid populations in check.

• Early spring application of dormant oils or insecticides.
• Removal and destruction of heavily infested shoot tips.
• Biological control using natural aphid predators.
• Systemic insecticide treatments during the active growth phase.