Noctuidae

The caterpillars of these moths go through several developmental stages (usually six instars). They are characterized by a robust body, often smooth or with sparse hairs, and possess a specific pattern of stripes or spots. When disturbed or at rest, they characteristically curl into a tight ring.

The life cycle of most species consists of four stages: egg, larva, pupa, and adult (imago). Overwintering most commonly occurs in the soil as a pupa or a late-instar larva, which ensures a high survival rate during harsh winter conditions.

Well-known members of this group include the turnip moth, cabbage moth, silver Y moth, and bollworm. A common trait across the family is the high fecundity of females, which can lay hundreds of eggs on the underside of leaves or in the topsoil.

Taxonomy within the family relies on wing venation in adults and the structure of larval mouthparts, which is essential for accurate species identification in a laboratory setting.

Owlet moths are polyphagous pests that cause damage to a wide variety of agricultural crops, including cereals, corn, sugar beets, sunflowers, vegetables, and ornamental plants.

The nature of the damage depends on the specific species. Cutworms lead a hidden life, severing plant stems at the soil surface, which leads to thinning of crops and the death of young seedlings.

Leaf-eating species consume leaf tissue, often leaving only the coarse veins behind, which severely reduces the photosynthetic surface and slows plant growth. Some species bore into fruits, such as tomatoes or corn ears.

Caterpillar infestations can result in massive economic losses, as their rapid proliferation can destroy 50–80% of a crop in a short time if left unmanaged.

Furthermore, the wounds caused by feeding caterpillars serve as entry points for secondary infections, such as fungal or bacterial pathogens, which can exacerbate the damage to the plant.

The flight period for most owlet moth species begins in May and continues through late summer. Activity is heavily influenced by weather conditions, with warm and moderately humid weather promoting higher reproduction rates.

The highest damage levels occur during seedling emergence in spring and during the fruit or ear development phases in summer. Pheromone traps are essential tools for agronomists to track the start of moth flights.

Generational development is closely tied to the phenological stages of the host plants. Under favorable conditions, many species can complete two or three generations per season, complicating integrated pest management.

In autumn, caterpillars migrate deeper into the soil for pupation and diapause, making them difficult to target with traditional control methods during that time.

Monitoring population density during critical crop growth stages is the most important factor in deciding when to initiate protection measures.

The first sign of owlet moth activity is often the presence of "windows" or holes in leaves. Inspection of the undersides of leaves may reveal clusters of eggs laid by the females.

The presence of cutworms is indicated by sudden wilting and falling of individual plants in the field. If the soil around a wilted plant is gently excavated, the characteristic curled-up larva can be found.

Accumulation of larval frass (excrement) on the leaves or the soil surface beneath the plants is another key diagnostic sign. These appear as small, dark, granular pellets.

For crops like corn or tomatoes, signs of infestation include boreholes in ears or fruit filled with excrement, often associated with the development of soft rots.

Using light traps or pheromone monitors at night allows for the early detection of large moth influxes, providing a window to prepare for caterpillar control.

An effective protection strategy against owlet moths must be integrated, involving agrotechnical, biological, and chemical methods to influence the pest population.

Agrotechnical measures include deep autumn plowing to bring pupae to the surface, where they become vulnerable to cold or predators, as well as systematic weed management to remove potential host reservoirs.

Biological control involves the use of natural enemies, such as Trichogramma wasps, which parasitize the moth eggs, significantly reducing population levels without the need for chemical pesticides.

Chemical control is justified when the economic injury threshold is reached. Insecticides with contact, stomach, or systemic action are used, ideally targeting young-instar larvae for maximum efficacy.

• Crop rotation practices.
• Spatial isolation of planting fields.
• Use of biological pesticides based on Bacillusthuringiensis.
• Timely application of authorized insecticides.