Aspergillus candidus

Aspergillus candidus is a fungus within the genus Aspergillus, belonging to the kingdom Fungi. It is primarily recognized as an opportunistic pathogen and a prolific storage mold that affects a wide variety of harvested agricultural commodities, including cereals, legumes, and oilseeds.

The fungus is notorious for causing white mold and "hidden" spoilage in stored grain. Its presence is most frequently observed in wheat, maize, and rice stored under sub-optimal conditions, where it exploits high moisture content and warm temperatures to colonize seeds and compromise their biological integrity.

The biology of Aspergillus candidus is characterized by rapid sporulation and an ability to thrive in warm environments. The pathogen produces dense white to cream-colored colonies consisting of conidiophores and conidia. Spores are highly resilient and easily disseminated by air currents, ensuring the fungus remains ubiquitous in agricultural environments.

Regarding its impact on crop quality, the pathogen is highly detrimental. Key issues include:

• drastic reduction in seed germination rates;
• contamination with mycotoxins like citrinin and kojic acid;
• significant loss of dry matter in stored lots;
• production of off-odors and discoloration, rendering grain unfit for market.

Integrated pest management strategies are crucial for controlling Aspergillus candidus. Prevention focuses on drying grain to safe moisture levels (typically below 14%), utilizing aeration systems to prevent hot spot formation, maintaining strict hygiene in storage facilities, and periodic monitoring for signs of fungal infestation.