Tansy aphid

Systematic position: Uroleucon tanaceti belongs to the order Hemiptera and the family Aphididae. It is a specialized insect that has adapted to feed primarily on host plants within the Asteraceae family.

Host plants and damage: This species primarily infests common tansy and related plants. The aphids congregate on tender shoots and leaf undersides, causing severe sucking damage that leads to stunted growth, leaf curling, and overall plant decline.

Biology and life cycle: The life cycle is characterized by rapid parthenogenic reproduction, allowing for large colony development within a short period. Winged forms develop during population peaks to migrate and colonize new, healthy plant hosts in the surrounding environment.

Damage symptoms include yellowing of leaves, premature wilting, and inhibited flower development. The secretion of honeydew by the aphids serves as a substrate for sooty mold, which blocks sunlight and interferes with the vital process of photosynthesis in the plant.

Control measures involve cultural practices such as removing infested plant debris and using biological controls like ladybirds or lacewings. When infestations reach economic thresholds, application of selective insecticides may be required to protect the crop effectively.