What do foreign grain beetles primarily feed on?

Foreign grain beetles primarily feed on fungal growth, which is abundant in stored grain and grain products. Their diet consists of various molds and fungi that can develop in stored foods, especially in environments with high humidity. This makes them particularly important pests in grain storage facilities, as they can contribute to the degradation of stored commodities by feeding on the fungi that often thrive in such conditions. Focusing on their role within the food chain, fungal growth serves as both a food source and a means of energy for them. This dietary preference highlights their ecological role in breaking down organic matter, but also emphasizes the potential economic impact they can have on grain industries when they infest stored products.