Sunflower moth

The sunflower moth (Homoeosoma electellum) is a destructive insect belonging to the order Lepidoptera and the family Pyralidae. It is considered one of the primary pests affecting sunflower production across North America and other regions where this crop is cultivated.

The primary host plant for this pest is the sunflower. However, it can also infest various other members of the Asteraceae family, including weeds and ornamentals, which serve as alternative food sources for the larvae throughout the growing season.

The biological cycle consists of four stages: egg, larva, pupa, and adult. Adult moths are primarily nocturnal and lay their eggs on the florets of sunflower heads. Upon hatching, the larvae tunnel into the sunflower head, feeding on the developing seeds and the floral tissue.

Damage caused by the larvae is severe. They consume seeds and leave behind silken webbing mixed with frass, which promotes the growth of pathogens like Rhizopus head rot. This damage reduces the overall seed yield, test weight, and total oil content, often resulting in significant economic losses.

Effective management strategies include the following:

• Planting resistant sunflower hybrids with high density of floral bracts.
• Monitoring adult moth activity using pheromone traps.
• Applying insecticides during the early flowering stage before larvae penetrate the head.
• Implementing cultural practices such as timely harvest to reduce late-season damage.