Green hairstreak

The Green hairstreak (Callophrys rubi) is a butterfly species within the order Lepidoptera and the family Lycaenidae. While often viewed as a common insect of nature, its larvae can act as opportunistic pests, feeding on the reproductive structures of various garden plants and fruit-bearing shrubs.

This species primarily attacks plants in the families Rosaceae and Fabaceae. Gardeners often observe them on blackberry, raspberry, and various leguminous crops. Due to their wide host range, they can easily migrate from wild habitats into managed agricultural environments, making surveillance essential.

The biology of Callophrys rubi follows a single-generation annual cycle. Adults emerge in early spring, and females deposit eggs individually on flower buds or young fruits. Upon hatching, the larvae bore into the plant tissue, where they develop while consuming the vital parts of the developing fruit.

Damage caused by the larvae is characterized by hollowed-out buds and damaged ovaries. This internal feeding often causes the fruits to wither or drop prematurely. If left unchecked, heavy infestations can result in significant yield losses, as the damage targets the most crucial stage of fruit development.

To effectively manage this pest, integrate cultural and chemical approaches. Early detection during the budding phase is critical for successful control. Targeted use of insecticides should be applied only when population thresholds are exceeded to minimize the impact on beneficial pollinators present in the garden.

Cultural practices, such as maintaining a clean field border and removing weeds that serve as alternative hosts, are recommended. In addition, deep autumn soil cultivation around the base of bushes is a highly effective way to disturb and destroy overwintering pupae, thereby reducing the population size for the upcoming season.