Poplar Grey

The Poplar Grey (Acronicta populi) is a moth belonging to the Noctuidae family. It is recognized as a significant pest of various deciduous trees, particularly those within the Salicaceae family, and can cause localized outbreaks that impact forest health and urban landscaping.

Biologically, the insect follows a complete metamorphosis life cycle, consisting of egg, larva, pupa, and adult stages. The adult moths are nocturnal, appearing in late spring. The larvae, which are the destructive stage, possess specialized mouthparts for consuming large volumes of foliage throughout the summer months.

Host plants commonly include various species of poplar (Populus), aspen, and willow. The caterpillar feeds actively on the leaves, leading to severe defoliation if the population density remains unchecked, which in turn stresses the host plant and reduces its overall growth rate.

The damage caused by Acronicta populi is primarily categorized as leaf consumption. While early instars may cause minor spotting, older caterpillars can strip entire branches, leaving only the primary veins. Such defoliation reduces the tree's vigor and can lead to secondary infestations by wood-boring insects due to the tree's weakened defense system.

Control measures for the Poplar Grey require an integrated pest management (IPM) strategy. Important actions include monitoring during the peak egg-laying season and encouraging natural predators such as birds and parasitic wasps. If necessary, horticultural oils or biological insecticides (like those containing Bacillus thuringiensis) are highly recommended to minimize environmental impact while controlling larvae populations.