Flour mite

Systematic position: The flour mite (Acarus siro) belongs to the order Acariformes and the family Acaridae. It is a cosmopolitan pest that thrives in stored food products, primarily impacting the agricultural and food industries worldwide.

Crops and products affected: This mite infests a wide range of stored grains such as wheat, oats, and rye, as well as flour, cereals, oilseeds, cheese, and animal feeds. It is particularly attracted to materials with relatively high moisture content which serve as a primary food source.

Biology and life cycle: The life cycle of Acarus siro consists of the egg, larva, protonymph, deutonymph (or hypopus stage), tritonymph, and adult. Under favorable conditions with high humidity and moderate temperatures, the life cycle is completed in approximately 10 to 15 days, allowing for exponential population growth.

Damage and economic significance: Flour mites consume the germ of the grain, significantly reducing its viability and nutritional value. Beyond physical consumption, they produce allergenic proteins and introduce microorganisms such as bacteria and fungi, which lead to spoilage, clumping, and the development of a distinct sour, minty odor in stored products.

Protection measures: Effective control relies on environmental management within storage facilities. Maintaining grain moisture levels below 13% is critical for preventing outbreaks. Warehouses should be kept clean, dry, and well-ventilated. In cases of established infestation, professional fumigation and the use of targeted acaricides are necessary to prevent total loss of the stored commodity.