Silver-washed fritillary

Taxonomic position: The Silver-washed fritillary (Argynnis paphia) belongs to the order Lepidoptera and the family Nymphalidae. While widely admired for its beauty, in certain landscape or horticultural contexts, its larval stage can act as a pest, particularly affecting specific garden plants and ornamental flower beds.

Target crops: The primary host plants for the larvae are species within the genus Viola (violets). In domestic gardens and commercial nurseries, they primarily affect ornamental pansies and violets. In years of high abundance, they have been observed feeding on foliage of other broad-leaved plants, including raspberry bushes if they are located near wild habitat fringes.

Biology and lifecycle: The species typically completes one generation per year. The overwintering stage is usually the first-instar larva, which emerges in early spring. Feeding occurs throughout the spring months. Pupation takes place in early summer on stems or nearby structures, with adult butterflies emerging in mid-summer to feed on nectar and mate.

Damage and harmfulness: The larval stage causes the most significant damage. Caterpillars are nocturnal feeders, consuming the leaf margins of host plants and often leaving only the major veins intact. Severe infestations lead to significant defoliation, which hampers plant growth, reduces bloom potential, and makes the affected plants susceptible to secondary pathogens.

Management strategies: Integrated pest management is recommended to control Argynnis paphia.

• Manual collection of caterpillars from foliage during the morning hours.
• Use of biological insecticides containing Bacillus thuringiensis if damage levels are significant.
• Habitat management, including clearing dense weeds that facilitate larval survival near cultivated flower beds.