Ghost moth

The Ghost moth (Hepialus humuli) is a member of the order Lepidoptera and the family Hepialidae. It is a well-known agricultural pest in many temperate regions, recognized for the peculiar mating flight of the males during twilight.

This pest affects a wide range of host plants, including hops, strawberries, potatoes, and various grasses. The primary damage is caused by the larval stage, which lives underground and feeds on the root systems of the plants.

The life cycle typically spans one to two years depending on environmental conditions. Female moths scatter eggs while flying over suitable host vegetation. Upon hatching, the larvae move into the soil, where they develop by consuming roots and boring into the rhizomes or stem bases.

The economic impact of Hepialus humuli is significant as the root damage prevents the plant from absorbing necessary water and nutrients. Infected plants often show signs of wilting, stunted growth, and eventually collapse, which can lead to major yield losses in commercial hop or strawberry fields.

Management strategies focus on cultural and biological interventions:

• Deep autumn cultivation to expose larvae to natural predators.
• Crop rotation to break the pest's life cycle.
• Maintaining field hygiene by controlling weeds which act as alternate hosts.
• Application of entomopathogenic nematodes to target soil-dwelling larvae.