Shark moth

Systematic position: The Shark moth (Cucullia umbratica) belongs to the order Lepidoptera, family Noctuidae. It is a nocturnal moth species widely distributed across the Palearctic region. Its common name is derived from the shark-like appearance of its resting wings, which feature long, streaked patterns.

Host plants: The larvae (caterpillars) of this species are polyphagous but show a strong preference for the Asteraceae family. Primary host plants include various types of lettuce (Lactuca sativa), sow thistles (Sonchus), hawkweeds (Hieracium), and several ornamental plants like asters, which can suffer significant damage when populations are high.

Biology and life cycle: The insect typically undergoes one or two generations per year. It overwinters as a pupa in a subterranean cocoon located in the soil. Adults emerge in late spring or summer. Females deposit eggs individually on the leaves of host plants, and the larvae develop through several instars before eventually burying themselves in the soil to pupate.

Damage patterns and economic importance: Larvae feed primarily at night and hide near the base of the plant during the day. They cause severe defoliation, consuming leaf blades and sometimes damaging flowers or buds. In commercial lettuce production, the presence of larvae or their frass significantly reduces the marketability and quality of the produce, often necessitating immediate control actions.

• Cultural control: Removing weed hosts from field margins and gardens.
• Soil cultivation: Tilling the soil in late autumn to expose and destroy overwintering pupae.
• Biological control: Applying products based on Bacillus thuringiensis when larvae are young.
• Chemical control: Using selective insecticides during the early stages of infestation to protect high-value crops.