Laurel psyllid

Systematic position: The laurel psyllid (Trioza brevigenae) is an insect species belonging to the order Hemiptera and the family Triozidae. These insects are commonly known as plant lice or jumping plant lice due to their ability to jump when disturbed and their sap-sucking habits.

Host plants: The primary host for this species is the bay laurel (Laurus nobilis). As a specialized pest, it focuses its life cycle exclusively on this plant, affecting both ornamental specimens in gardens and commercial bay laurel plantations in relevant climatic zones.

Biology and life cycle: The psyllid overwinters as an adult, finding shelter in the crevices of bark or among leaf debris. In the spring, when new growth appears on the laurel, the insects emerge, mate, and lay eggs on the tender foliage. The nymphs that hatch from these eggs feed on the leaves, triggering the formation of galls, which serve as their protective environment.

Damage symptoms: The presence of Trioza brevigenae is easily identified by the formation of characteristic galls on the leaves. These deformations vary in shape and color, often appearing as yellowish or reddish bumps. Severe infestations result in extensive leaf curling, hindered growth, premature leaf drop, and a significant loss in the aesthetic and commercial value of the plant.

Control measures: Integrated pest management strategies are recommended to keep the population under control:

• Manual removal and destruction of infested leaves and shoots during the early stages of gall development.
• Application of systemic insecticides when nymphs are in the early instars.
• Encouraging natural predators such as ladybirds and lacewings in the garden ecosystem.
• Pruning to maintain good air circulation and plant health, reducing favorable conditions for the pest.