Clover lappet

Systematic position The clover lappet (Lasiocampa trifolii) is a moth species belonging to the family Lasiocampidae, order Lepidoptera. It is a well-known agricultural pest in many temperate regions, capable of causing significant foliage damage to various forage and herbaceous crops.

Host plants The larvae of this species are polyphagous, meaning they feed on a wide variety of plants. Their preferred hosts include legumes such as clover, alfalfa, and sainfoin. In addition to legumes, they may also target different grass species and occasionally woody vegetation if their primary food source is depleted.

Biology and life cycle The clover lappet completes one generation per year. It typically overwinters as young larvae hidden within the soil or debris. In the spring, they emerge and start feeding on fresh green shoots. The pupal stage occurs in a dense, spindle-shaped cocoon, often spun within the foliage or near the soil. Adult moths appear in late summer to mate and lay eggs.

Damage and pest status The primary damage is inflicted by the larvae, which are voracious eaters. They consume leaf tissue, often leaving only the main veins, which significantly reduces the photosynthetic area of the plant. High infestations can lead to substantial biomass loss, reduced hay quality, and poor seed yield in legume fields.

Management strategies Integrated pest management (IPM) is essential for controlling Lasiocampa trifolii. Recommended practices include:

• Deep tillage in the autumn to expose overwintering larvae to predators and frost.
• Crop rotation to break the moth's life cycle in infested areas.
• Timely harvesting of forage crops to remove the food supply of young caterpillars.
• Application of selective insecticides or biological control agents when monitoring indicates a high population density.