Metopsia

Systematic position. The genus Metopsia belongs to the family Staphylinidae, subfamily Proteininae. Unlike the majority of rove beetles which are known to be predators, species within the Metopsia genus exhibit phytophagous behavior, occasionally causing economic damage to commercial crops by feeding on vegetable tissues.

Crops damaged. These insects are primarily associated with vegetable crops, including members of the Solanaceae and Brassicaceae families. They are frequently found in moist agricultural environments where they may inhabit both open fields and greenhouses, feeding on decaying matter as well as living plant tissues.

Biology and life cycle. The life cycle of Metopsia includes egg, larval, pupal, and adult stages. They thrive in damp, organic-rich environments. The beetles are nocturnal, hiding during the day in the soil or under debris, which protects them from predators and environmental fluctuations. Overwintering occurs in the soil or protected organic debris.

Damage and harm. The adults and larvae cause injury to seedlings and young plants by grazing on the epidermis and leaf parenchyma. This feeding activity not only damages the physical structure of the plant but also creates entry points for various pathogens, potentially leading to bacterial soft rot and other fungal diseases, significantly reducing crop vigor.

Control measures. Managing Metopsia requires an integrated approach focusing on cultural practices to alter their habitat:

• Deep tillage in the autumn to disrupt overwintering sites.
• Maintaining proper soil moisture and improving field drainage.
• Sanitation, including the removal of crop residues and weeds that harbor populations.
• Applying chemical insecticides or biological agents only when monitoring indicates damage exceeds the economic threshold.