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Clever anti-bagging apple crunch
After bagging apples, it's common to observe micro-cracking and wrinkling on the fruit surface. This issue can occur in two different ways: First, the fruit inside the bag may develop creases or wrinkles, which become more severe once the bag is removed. Second, the fruit may appear normal while still in the bag, but after the bag is removed and the fruit begins to color, it may show signs of micro-cracks, wrinkled skin, and a soft texture—undesirable characteristics that affect quality.
The primary cause of these problems is high temperatures and drought conditions before and during the growth period of the apple. The temperature inside the bag can exceed 50°C during the day, while the ideal range should be between 35°C and 45°C. When the fruit experiences a short first growth phase and stops growing early, it becomes thin and delicate. Once the bag is removed, if water is abundant, the fruit may undergo a rapid second expansion. This quick cell division in the pulp leads to a mismatch with the slower cell division in the peel, resulting in micro-cracks. Water loss after cracking causes the fruit to shrink and become soft. Additionally, calcium deficiency in the fruit can also contribute to this issue.
To prevent these problems, several measures can be taken. After flowering, if the weather turns hot and dry, it’s advisable to spray water onto the leaves in the evening—before and after sunset—intermittently until the leaves begin to drip. Adding 1% potassium dihydrogen phosphate or amino acid calcium to the water can enhance effectiveness.
During the first and second stages of fruit enlargement, spraying a 2% solution of amino acid calcium in the evening is recommended. Also, applying naphthalene acetic acid once during the early to mid-stage of the second fruit expansion can help reduce the risk of cracking.
During the fruit coloring stage, it’s important to prune some leaves and turn the fruits to ensure even exposure to sunlight, promoting uniform development and reducing stress on the fruit skin. These practices not only improve fruit quality but also increase marketability and overall yield.
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Clever anti-bagging apple crunch