Pale Prominent

Systematic position. The Pale Prominent (Pterostoma palpina) is a moth belonging to the order Lepidoptera and the family Notodontidae. It is a common species found throughout forests and suburban areas, occasionally reaching population densities that impact tree health.

Host plants. This pest is an oligophagous insect that primarily feeds on deciduous trees. Its preferred hosts are species of poplar (Populus) and willow (Salix). In some regions, it can also be found on aspen, alder, and linden trees, particularly causing economic damage in forest nurseries and young plantations.

Biology and life cycle. The insect typically has one or two generations per year, depending on the climate. It overwinter as a pupa within the soil or in the leaf litter. Adult moths emerge in the spring. Females lay eggs in small clusters on the underside of the leaves. The larvae go through five instars, feeding actively throughout the summer months.

Damage patterns. Larvae of the Pale Prominent are cryptic and often rest along the veins of the leaves, making them difficult to spot. Early instars create small holes in the foliage, while later instars consume entire leaves, leaving only the midribs and large veins. In cases of severe infestation, the pest can cause significant defoliation of trees, reducing their vigor.

Control measures. Integrated pest management includes cultural practices such as cultivating the soil around trees in autumn to expose and destroy overwintering pupae. Encouraging insectivorous birds in the garden is also recommended as a biological control strategy. If chemical intervention is necessary, insecticides targeting early larval instars should be applied to the canopy during the peak emergence period.