Fruit and vegetable mold

The fungus does not form a true mycelium but develops a pseudomycelium, consisting of elongated cells. Its metabolism leads to the rapid decomposition of host tissues and changes in the chemical balance of the fruit surface.

This pathogen is ubiquitous and can be found in soil, on plant debris, and in the air of storage facilities. Because of its prevalence, it is nearly impossible to completely eliminate it from the environment.

Infection primarily occurs through contact with contaminated surfaces, tools, or through the air within poorly ventilated storage areas, where the yeast cells settle on the moist skin of the produce.

Candida mycoderma acts as a secondary pathogen, taking advantage of existing mechanical damage or tissue weakness to colonize the interior of fruits and vegetables.

The primary symptom is the appearance of a thin, whitish, wrinkled film on the surface of the produce. Over time, this film may thicken and take on a leathery appearance.

The tissue underneath the film typically becomes soft and watery. Unlike some other molds that produce fluffy mycelium, this pathogen usually manifests as a dense, skin-like layer on the affected area.

A characteristic sign of advanced infection is the development of a sour or alcoholic smell, which is the result of active fermentation processes occurring within the affected fruit or vegetable tissues.

Infections often spread rapidly to adjacent healthy produce, resulting in pockets of rot within crates or storage bins, which can destroy an entire batch if not addressed promptly.

When an infected fruit is cut, one can observe localized discoloration and sometimes gas bubbles in the tissue, indicating that the fungal activity has penetrated beyond the outer surface.

The development of Candida mycoderma is favored by high relative humidity (above 85–90%) and temperatures ranging from +15°C to +25°C, though it can survive at lower temperatures in cold storage.

Lack of proper ventilation is a major contributing factor, as stagnant air allows moisture to collect on produce, creating the perfect environment for the yeast to bloom.

Mechanical injuries during harvesting or transportation provide direct entry points for the pathogen, allowing it to bypass the plant's natural protective barriers, such as the skin or peel.

Condensation caused by temperature fluctuations in storage rooms is a common catalyst for outbreaks, as it provides a water film for the fungus to move and propagate.

Poor sanitation of equipment, storage containers, and warehouse walls creates a high inoculum pressure, making it much easier for the disease to break out during the storage season.

The primary harm caused by this mold is the mass spoilage of stored produce, leading to significant financial losses for producers and distributors due to the necessity of discarding large volumes of goods.

In addition to physical loss, the mold ruins the organoleptic qualities of the produce, rendering it completely inedible and unfit for any commercial processing or culinary use.

The fermentation processes initiated by the yeast can negatively alter the texture and chemical composition of the produce, making it unmarketable and lowering its overall nutritional value.

The presence of this mold often paves the way for other, more aggressive pathogens to infect the crop, creating a synergistic effect that accelerates the rate of total rot.

Sorting and cleaning affected batches to remove moldy items adds labor costs and reduces the efficiency of supply chains, impacting the final pricing and profitability of the crop.

Effective control requires strict environmental management in storage facilities, including the maintenance of optimal humidity levels and consistent, high-quality airflow.

• Thorough disinfection of storage areas before the season.
• Use of clean, sanitized containers for harvest storage.
• Strict sorting to remove bruised or wounded produce before storage.
• Implementation of robust ventilation protocols.

Regular monitoring of the stored produce is essential to detect early signs of mold and immediately remove affected items to prevent the spread of infection to healthy stock.

Applying safe and approved antimicrobial treatments to the surface of the produce before storage can significantly reduce the initial fungal load and protect the fruits during their shelf life.

Preventing physical damage during the harvest process is one of the most effective long-term strategies, as intact skin remains a strong defense against Candida mycoderma colonization.