Broad-horned flour beetle

The broad-horned flour beetle (Gnatocerus cornutus) is a significant pest of stored agricultural products, belonging to the family Tenebrionidae. It is frequently found in flour mills, warehouses, and storage facilities, where it can thrive on debris and accumulated dust in corners, machinery, and structural crevices.

This insect primarily infests processed grain products such as flour, bran, cereals, and animal feed. It is a secondary pest, meaning it usually exploits stocks that are already degraded or kept in environments with poor sanitation, though it can cause extensive damage when infestations go unchecked over long periods.

The biology of the broad-horned flour beetle is defined by its ability to complete multiple generations throughout the year in climate-controlled indoor environments. Males are easily identifiable by their prominent, horn-like mandibles, which are used for intraspecific competition. The larvae are cream-colored and feed extensively on the same food sources as the adults.

The damage caused by these beetles is twofold: direct consumption of the product and contamination. By feeding on the starch and endosperm of grain products, they significantly reduce weight and nutritional value. Moreover, their presence introduces excrement and cast skins into the food supply, which can trigger spoilage and secondary attacks by fungi or mites.

Control measures must focus on rigorous sanitation and environmental management. Key strategies include:

• Sanitizing machinery to remove residual flour and dust.
• Maintaining low moisture content in stored goods to inhibit breeding.
• Utilizing pheromone traps for early detection of adult populations.
• Applying professional fumigation treatments in warehouses to eradicate deep-seated infestations.