Variable burnet

The variable burnet (Zygaena ephialtes) is a moth belonging to the order Lepidoptera and the family Zygaenidae. It is a striking insect known for its warning coloration, which advertises its chemical defenses to predators, as both larvae and adults contain high levels of cyanide compounds.

This species primarily feeds on host plants within the Fabaceae family, such as crown vetch, clover, and vetchling species. In agricultural settings, it can affect perennial forage crops, leading to direct economic losses by reducing the quality and quantity of the harvestable green biomass.

The life cycle consists of a single generation per year. Larvae overwinter in the litter or soil, emerging in spring to feed. Pupation occurs in silk cocoons attached to plant stems or other substrates. Adults are diurnal, being most active during the sunny hours of the summer season from June to August.

The damage is mainly caused by the larvae, which feed on the leaves. They skeletonize or consume the foliage entirely, leaving only the veins. This feeding pattern significantly reduces the photosynthetic capacity of the plants, ultimately stunting their growth and decreasing the nutritional value of forage fields.

Effective management strategies for this pest include a mix of cultural and chemical interventions:

• Timely mowing of forage crops to destroy larvae before they pupate.
• Crop rotation strategies to break the life cycle of the moth.
• Regular monitoring of fields to detect early infestations and determine the need for control.
• Application of selective insecticides if population thresholds are exceeded to minimize impact on non-target species.