Saccharomycetales

Saccharomycetales are a taxonomic order of yeasts that are not typically primary plant pathogens but act as opportunistic agents causing fruit rot and spoilage. In an agricultural context, their ability to initiate fermentation in living or harvested tissue makes them a significant factor in post-harvest losses.

These organisms primarily affect sugar-rich crops, including grapes, strawberries, stone fruits, and various vegetables like tomatoes. They colonize fruits through pre-existing injuries, such as wounds from pests, mechanical damage during harvest, or cracks caused by environmental stress like excess rain.

Symptoms include rapid tissue softening, the release of acidic or fermented odors, and the appearance of wet, discolored patches on the fruit surface. In advanced stages, bubbles of carbon dioxide may emerge from the infected tissue, leading to a breakdown of the structural integrity of the crop.

Development is highly dependent on humidity and temperature. Warm, moist conditions significantly accelerate yeast proliferation. Because these fungi thrive on simple sugars, fruits at the peak of maturity are the most susceptible to infection, making timing of harvest critical for limiting spread.

Economic damage is primarily linked to the rapid loss of produce quality. Effective management relies on integrated strategies to protect tissue health:

• Minimize mechanical damage during harvesting and transport.
• Control insect populations that create entry wounds.
• Maintain proper storage conditions (low temperature and ventilation).
• Remove infected debris from the field to reduce inoculum.
• Use appropriate cleaning protocols for storage containers.