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Variability in Postharvest Decay Among Apple Cultivars
R A Spotts1, L A Cervantes1, E A Mielke1
1Mid-Columbia Agricultural Research and Extension Center, Oregon State University, Hood River 97031.
Plant Disease
|March 8, 2019
Summary
Apple cultivars show varied resistance to fungal decay and physical damage. Royal Gala resisted wound pathogens, while Fuji and Granny Smith had tougher skin, indicating diverse decay resistance traits for the apple industry.
Area of Science:
- Horticulture
- Plant Pathology
- Pomology
Background:
- Apple fruit decay resistance is crucial for the industry.
- Understanding cultivar-specific resistance mechanisms is vital for post-harvest quality.
- Factors like fungal pathogens, epidermal strength, and fruit structure influence decay.
Purpose of the Study:
- To evaluate decay resistance in apple cultivars against four fungal pathogens.
- To assess physical resistance, including epidermal puncture force and open sinus extent.
- To identify apple cultivars with superior potential decay resistance.
Main Methods:
- Tested resistance to Botrytis cinerea, Penicillium expansum, Mucor piriformis, and Pezicula malicorticis.
- Measured the force required to puncture the fruit epidermis (skin).
- Quantified the percentage of fruit with open sinuses, a potential entry point for decay.
Main Results:
- No single cultivar exhibited complete resistance to all four pathogens.
- Royal Gala showed high resistance to wound pathogens (B. cinerea, P. expansum, M. piriformis).
- Fuji and Oregon Spur II were more resistant to P. malicorticis; Fuji and Granny Smith had the toughest epidermis.
Conclusions:
- Apple cultivar decay resistance is complex and pathogen-specific.
- Fuji exhibited a high incidence of open sinuses, potentially increasing susceptibility.
- Data provides valuable insights into cultivar decay resistance for the apple industry.
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