Grease moth

The Grease moth (Aglossa pinguinalis) belongs to the order Lepidoptera and the family Pyralidae. It is a well-known stored-product pest that thrives in environments where grain or plant-based materials are stored under conditions of relatively high humidity.

This pest targets a variety of stored goods, including cereals, flour, bran, oilseed cakes, dried fruits, and hay. It is commonly found in grain silos, warehouses, and barns where sanitation standards might be compromised, often seeking out damp, decaying organic matter.

The biology of the species involves a lifecycle from egg to larva, pupa, and adult moth. The larvae are particularly damaging, as they construct silk-webbed tunnels or nests within the stored substrate. Under stable warehouse conditions, the life cycle is typically univoltine, but development can accelerate if temperatures are consistently high.

The primary economic damage is caused by the larvae consuming the product and contaminating it with frass and dense silken webs. These webs cause the grain or food particles to clump together, which creates microclimates that encourage the rapid growth of molds, yeast, and other secondary spoilage organisms.

• Maintain low moisture levels in all storage areas.
• Implement strict sanitation to remove spilled grain and dust.
• Seal cracks and crevices to prevent moth entry.
• Use professional fumigation methods for severe infestations.
• Conduct regular visual inspections and use pheromone traps for monitoring.