Lesser Swallow Prominent

The Lesser Swallow Prominent (Pheosia tremula) belongs to the order Lepidoptera, family Notodontidae. It is a moth species distributed across the temperate zone of Eurasia, which in its larval stage can cause significant damage to various deciduous tree species.

The primary food sources for this pest are members of the Salicaceae family, particularly aspen, poplar, and various willow species. During periods of population outbreaks, the caterpillars may infest other broad-leaved trees, significantly reducing their aesthetic value and overall physiological health.

The biology of the species involves development in one or two generations per season, depending on the climatic conditions of the region. It overwinters as a pupa in the soil or leaf litter. In spring, the moths emerge and lay eggs on the undersides of the leaves of host plants. Larval development occurs throughout the summer, after which the caterpillars burrow into the soil for pupation.

The damage pattern involves skeletonizing or completely consuming leaf blades. When population density is high, the pest can cause significant defoliation of trees, which leads to reduced photosynthesis, lower annual wood increment, and makes the tree more susceptible to secondary pests and various plant diseases.

Control measures include both biological and chemical approaches. Recommended practices include:

• Encouraging natural predators and insectivorous birds in forest areas.
• Application of systemic or contact insecticides during the early larval stage.
• Monitoring population density using light traps to determine the optimal timing for protective measures.
• Maintaining good forest sanitation and timely management of affected leaf litter.