Cherries are highly valued for their sweet flesh. Undoubtedly, this attribute and the particular characteristics of this fruit make it one of the most susceptible fruits to cracking due to rainfall. In the following paragraphs, researchers from the Universidad de Talca address the causes of this issue and some prevention strategies.
Each season, cracking poses a threat to the harvest, potentially leading to complete production loss if rains occur during the advanced stages of fruit ripening. According to Fedefruta estimates, the October and November rains of the 2023/24 season caused a 50% reduction in early cherry varieties' production, particularly affecting the O'Higgins region and the province of Curicó. Damaged fruits cannot be marketed due to their rapid susceptibility to developing diseases, resulting in significant reductions in orchard income.
The specific mechanisms involved in cherry cracking are still under discussion. Currently, one of the most accepted hypotheses is that proposed by the Agricultural Production Systems Institute at the University of Hannover in Germany, which suggests a “zipper model”, where fruit cracking occurs similarly to the opening of a zipper on clothing (Figure 2).
Figure 2: Flow diagram of the zipper model explaining the processes involved in rain-induced cracking in cherries. Adapted from Knoche and Winkler (2019).
During rainfall, deposited water moves toward the fruit through microfractures in the cuticle generated during growth. Absorption occurs due to the high osmotic potential difference between the flesh and rainwater. This leads to a rapid volume increase in some epidermal cells, causing various tensions within the fruit structure. When rainfall is heavy, water absorption in the cells can lead to membrane rupture, releasing malic acid into the apoplast, which solubilizes calcium bound to cell walls, weakening their integrity and adhesion between cells.
This causes tissue separation between cell walls, prolonging the partitioning as water absorption continues. Studies conducted by the Pomáceas Center have established that a fruit volume increase between 2.0% and 2.5% is sufficient to cause fruit cracking...
Want to read the full article? Sign up for our free Cherry Times newsletter! This is the only way to receive each new article directly in your inbox and stay updated with high-quality advice and analysis. Don't miss this unique opportunity!
Sign up for the Cherry Times newsletter for free!
08 Jan 2025
The surface pitting damage is caused by mechanical damage before and after harvest. The defect only manifests itself after 7-10 days of cold storage, after packing and inspection of the fruit, and has substantial economic implications.
25 Apr 2023
Sweet cherry breeders will face difficult but exciting challenges during the coming years and multilateral cooperation between them and with scientists from University and research centers appears as crucial.
09 May 2025
Cherry Growers Australia appoints Penny Measham as new CEO from May 12, 2025. With an international background, she will confidently lead the cherry sector towards new goals, boosting global presence and strongly supporting local Australian growers.
09 May 2025
Spanish cherries are conquering China as a symbol of luxury and prosperity. Thanks to e-commerce, emotional marketing, premium quality, rising demand, social media, and packaging, Spain has a unique chance to stand out in China’s highly competitive fresh premium cherry market.
