Hop snout moth

The Hop snout moth (Hypena rostralis) is a moth belonging to the order Lepidoptera and the family Noctuidae. It is recognized as a specific pest of hops (Humulus lupulus). Although it is not always classified as a primary threat in all regions, its presence can significantly impact the health and productivity of hop yards.

This pest primarily attacks hop plants. The larvae feed on the foliage, and in cases of high population density, they can cause substantial defoliation. Damage to the leaves hinders the plant's ability to produce energy, which is essential for the maturation of the hop cones, the primary harvestable product.

The life cycle of Hypena rostralis includes four distinct stages: egg, larva, pupa, and adult. Adult moths hibernate during the winter in protected environments such as bark crevices, leaf litter, or farm structures. As temperatures rise in spring, they emerge to lay eggs on the host plants.

The damage is characterized by ragged holes in the leaves or complete skeletonization. Severe infestations can weaken the vine, leading to stunted growth and reduced yield. Because hops require a large canopy to support cone development, any reduction in leaf area is economically significant.

Effective management strategies for this pest include:

• Maintaining field hygiene by removing plant debris after the harvest.
• Monitoring adult activity using light traps or pheromone lures to time treatments.
• Encouraging natural predators and parasitoids within the hop yard ecosystem.
• Applying selective insecticides during the larval stage when thresholds are exceeded.