Eurotium echinulatum

Eurotium echinulatum is a species of ascomycetous fungus that serves as the teleomorphic stage of the well-known mold Aspergillus echinulatus. It is classified as a xerophilic microorganism, meaning it is highly adapted to environments with low water activity, which poses a significant threat to stored agricultural commodities.

This pathogen commonly attacks a wide range of stored agricultural crops, including cereals such as wheat, corn, and barley, as well as oilseeds, legumes, and nuts. It is particularly notorious for causing spoilage in warehouses and silos, where it can contaminate feed supplies and lead to significant economic losses.

The visual symptoms of infestation typically include the emergence of a powdery mold growth on the grain surface, ranging from yellow to olive-brown. Beyond the visible signs, the fungus penetrates the seed coat, triggering biochemical changes that cause discoloration, a musty odor, and a total loss of seed germination potential.

The development of this fungus is triggered by poor storage conditions, primarily high grain moisture levels and inadequate ventilation. Because it is highly tolerant of dry environments, it can thrive in areas where other fungi might fail, making it a persistent issue in facilities with poor temperature control or leaking roofs.

Management and prevention focus on maintaining optimal storage conditions to discourage fungal activity. Key strategies include drying grain to safe moisture levels (typically below 14%), maintaining low temperatures, performing regular cleaning of storage bins to remove debris, and implementing constant monitoring for early signs of mold hotspots.