Fungus beetle

The fungus beetle (Corticaria fulva) belongs to the family Latridiidae, order Coleoptera. It is a tiny beetle, typically measuring between 1.5 and 2.5 mm in length.

The adult beetle has a reddish-brown to rusty-brown coloration, which gives the species its name. The elytra (wing covers) are distinctly punctured, and the body is covered with fine, sparse hairs.

Larvae are elongated, whitish or yellowish in color, and possess a well-defined chitinized head. They are often found in dark, damp areas where fungal growth is present.

Adult beetles are capable of flight, which enables them to spread rapidly throughout storage facilities, especially in warm and humid conditions.

This species is a typical inhabitant of warehouses, where it lives primarily on molds and microscopic fungi that develop on moist grain or other stored food products.

The fungus beetle is commonly found in stores of grain, flour, bran, dried fruits, and other agricultural commodities. It is considered a secondary pest because it cannot feed on healthy, dry grain kernels.

The damage caused by this insect involves the contamination of products with frass, larval skins, and metabolic waste, which degrades the quality and market value of the goods.

The beetle prefers products with high moisture content where mold growth is prevalent. By feeding on the mold, they further spread fungal spores throughout the grain mass.

In cases of heavy infestation, the activity of these beetles can contribute to the self-heating of grain, leading to severe spoilage and the creation of hot spots within the bulk storage.

Warehouse managers often notice a distinct musty or fungal odor in infested batches, which makes the product unsuitable for human consumption or processing.

The development cycle of the fungus beetle is heavily dependent on environmental factors, specifically temperature and humidity levels within the storage facility.

Optimal development occurs at temperatures between 20°C and 25°C with a grain moisture content above 14–15%. Under these conditions, the insect can reproduce continuously.

During the spring and summer months, the activity of the beetles increases as temperatures rise, leading to more frequent dispersal throughout grain elevators and warehouses.

In autumn, beetles often retreat into the deeper layers of the grain pile, where temperatures are more stable, allowing them to survive through cooler periods successfully.

The generation time is relatively short, which allows the population to grow rapidly if the storage conditions are not properly managed or monitored.

The most immediate sign of infestation is the physical presence of adult beetles in grain samples or on the inner surfaces of storage containers.

A moldy or dusty appearance on the surface of the stored product is a common indicator, as these beetles thrive where dampness promotes fungal growth.

Laboratory analysis of grain samples, using sifting and visual inspection, usually reveals the presence of larvae and adults, indicating poor ventilation and high moisture.

An increase in internal temperature within the grain storage, often referred to as a "hot spot," serves as an indirect sign that fungus beetles and associated microflora are active.

A persistent, musty, or fungal smell emanating from the stored commodity is another reliable symptom of an advanced infestation that requires immediate attention.

The primary control measure is maintaining grain moisture content below 14%, as this effectively inhibits the growth of the mold that serves as the beetle's food source.

• Ensuring storage facilities are sealed and properly maintained.
• Cleaning warehouses thoroughly to remove debris and residual grain before new harvests are stored.
• Using active ventilation systems to regulate temperature and humidity levels inside the storage bulk.
• Applying professional fumigation or insecticide treatment if localized outbreaks of the pest are detected.

Regular monitoring using specialized traps is essential to detect the arrival of the beetles early and prevent them from spreading throughout the entire facility.

For severe infestations, a comprehensive pest control program, including sanitation and chemical intervention, is necessary to protect the stored commodities and prevent further losses.