Pale western cutworm

The pale western cutworm (Agrotis orthogonia) is a member of the order Lepidoptera and the family Noctuidae. It is recognized as a serious agricultural pest, particularly in regions prone to dry springs, where its impact on cereal crop establishment can be catastrophic if not managed properly.

This species primarily attacks small grain crops, including wheat, barley, and oats. In agricultural landscapes, it is known for causing significant stand thinning, as the larvae feed on the stems of young plants, often leading to total loss of seedlings in infested areas of the field.

The biology of Agrotis orthogonia consists of a single generation per year. The insect overwinters in the egg stage within the soil. Larvae hatch in the spring and feed underground or at the soil surface, primarily during the night, while spending daylight hours burrowed in the ground.

The damage caused by these cutworms is characterized by severed plant stems just below the soil surface. This type of damage prevents the plant from recovering, and high larval densities can quickly reduce plant population to levels that require reseeding, leading to severe economic losses for farmers.

Effective management strategies require an integrated approach. Cultural practices such as late-season tillage and weed control are essential to limit habitat. Chemical control via insecticide application is often necessary when threshold levels are reached, ideally timed to coincide with evening larval activity.

• Monitor fields for cutworm feeding activity.
• Implement proper crop rotation sequences.
• Use seed treatments for early-season protection.
• Time insecticide spraying for evening hours.