Metallic false wireworm

Systematic position. Blapstinus metallicus is a beetle belonging to the order Coleoptera and the family Tenebrionidae (darkling beetles). In the agricultural context, it is widely known as a false wireworm, characterized by its soil-dwelling habits and destructive feeding behavior.

Crops affected. This pest acts as a generalist, feeding on a variety of agricultural crops. It is particularly problematic for emerging corn, wheat, sunflower, and various vegetable crops. Both adult beetles and larvae are capable of causing significant damage to the roots and underground parts of young plants.

Biology and life cycle. The life cycle of Blapstinus metallicus is completed primarily within the soil environment. Adults overwinter in protected soil niches or under crop residues. Upon the arrival of spring, they emerge to feed and deposit eggs. The larvae develop within the soil, passing through several instars while consuming decaying organic matter and living roots of cultivated plants.

Damage and economic significance. The most critical period of damage occurs during seed germination and seedling emergence. Adults and larvae feed on the hypocotyl and primary roots, often resulting in seedling collapse or significant stand reduction. Economic losses are exacerbated by environmental stress, as damaged plants struggle to recover from even moderate infestations.

Protection measures. Effective management requires an integrated approach. Recommended strategies include:

• thorough soil tillage to disrupt larval development;
• maintenance of strict crop rotation cycles;
• use of systemic insecticidal seed treatments;
• application of soil-incorporated insecticides at planting if high pest pressure is anticipated.