Hansenula subpelliculosa

Hansenula subpelliculosa (synonym Wickerhamomyces subpelliculus) is a species of yeast belonging to the phylum Ascomycota. While many yeasts are beneficial, this specific organism is identified as a phytopathogen capable of causing significant post-harvest losses in various agricultural commodities by inducing spoilage and fermentation of plant tissues.

The primary hosts for this pathogen include a wide range of fruits, such as apples, pears, and stone fruits, as well as various vegetables. Infection typically leads to tissue softening, liquid exudation, and an off-putting fermentative odor, which renders the produce commercially unviable and unsuitable for consumption.

The biology of Hansenula subpelliculosa is centered on its metabolic efficiency in utilizing soluble sugars. The life cycle involves vegetative budding and the production of ascospores, which are highly resilient. These spores allow the pathogen to persist in agricultural environments, surviving on farm surfaces, harvesting machinery, and storage crates.

Transmission of the fungus usually occurs via vectors like fruit flies or through mechanical injuries to the fruit surface. High relative humidity and moderate to warm temperatures are the critical environmental factors that trigger rapid colonization and disease progression in storage facilities.

To minimize the impact of this pathogen, integrated management strategies must be implemented in agricultural and storage settings:

• Strict adherence to temperature and humidity controls in post-harvest storage.
• Sanitization of storage facilities and harvesting equipment to reduce inoculum levels.
• Implementation of pest control programs to prevent mechanical injury to fruits.
• Timely removal of infected or decaying plant material from the site.