Wormwood head aphid

The Pleotrichophorus glandulosus, commonly known as the wormwood head aphid, belongs to the family Aphididae within the order Hemiptera. This species is a specialized pest that primarily targets plants within the Asteraceae family, demonstrating a preference for Artemisia species and various ornamental plants like chrysanthemums.

These aphids colonize the undersides of leaves, young shoots, and flower buds. By inserting their piercing-sucking mouthparts, they drain plant sap, which leads to metabolic stress and structural damage to the host plant tissues.

The life cycle of this aphid involves overwintering as eggs on the stems or root crowns of host plants. As temperatures rise in spring, the eggs hatch into fundatrices. Throughout the growing season, multiple generations of wingless and winged individuals reproduce rapidly through parthenogenesis, leading to massive population growth.

Symptoms of infestation include severe leaf curling, stunted plant growth, and premature yellowing of foliage. The honeydew excreted by the aphids can promote the growth of sooty mold, which blocks sunlight and hinders photosynthesis, significantly reducing both the aesthetic and commercial value of the affected crops.

Control strategies for Pleotrichophorus glandulosus require an integrated approach. Sanitation is crucial: remove alternative weed hosts and infected plant debris from the garden. For severe infestations, the use of targeted systemic insecticides is effective, ensuring that applications are timed before the colonies cause irreversible damage.