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Clever anti-bagging apple crunch
After bagging apples, micro-cracking and wrinkling can easily occur. This issue can be categorized into two scenarios: First, the fruit inside the bag may develop creases, which become more severe once the bag is removed. Second, there may be no visible issues while the fruit is still in the bag, but shortly after the bag is removed, the skin may show micro-cracks, wrinkles, or even softness—unfavorable conditions that affect fruit quality.
The primary cause of these problems is high temperatures and drought during the apple's growth period. The temperature inside the bag can exceed 50°C during the day, whereas the ideal range should be between 35°C and 45°C. When the fruit experiences a short first growth phase and stops growing early, the skin becomes thin and delicate. Once the bag is removed, if water is abundant, the fruit may undergo rapid secondary expansion. However, because the pulp cells divide quickly while the peel cells divide more slowly, this discrepancy leads to micro-cracks. After the cracks form, water loss causes the fruit to shrink and soften. Additionally, calcium deficiency in the fruit can also contribute to this problem.
To prevent such issues, several measures can be taken:
After flowering, if high temperatures and drought occur, it’s recommended to spray water onto the leaves in the evening (before and after sunset) intermittently until the leaves are dripping with moisture. It’s also beneficial to mix 1% potassium dihydrogen phosphate or amino acid calcium into the water when spraying.
During the first and second stages of fruit enlargement, a 2% solution of amino acid calcium should be sprayed, preferably in the evening.
In the early and middle stages of the second fruit expansion, spraying naphthalene acetic acid once can help regulate growth and reduce stress on the fruit.
Additionally, during the coloring stage, it's important to prune some leaves and turn the fruits to ensure even exposure to sunlight, promoting better color development and reducing the risk of cracking. These practices not only improve fruit appearance but also enhance overall quality and marketability.
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Clever anti-bagging apple crunch