How do you treat apple water core cracking and fruit shrinkage disease? What spray should be used?
Apple fruit surface cracking is a physiological disorder that has become widespread in recent years, and fruit growers commonly call it apple cracking disease. Fruit shrinkage disease, on the other hand, causes small, deformed fruit that tends to drop early.So how do you treat apple water core cracking and fruit shrinkage disease? What spray should be used?
How do you treat apple water core cracking? What spray should be used?
1. Apply more bio-organic fertilizer to strengthen the tree vigor and improve the tree's regulatory capacity and stress resistance.
2. Within 40 days after petal fall, ensure an adequate water supply; during the fruit enlargement period, irrigate regularly and in appropriate amounts to ensure that the peel cells and flesh cells expand steadily and evenly.
3. Optimize the tree shape, thin out excess branches, open up the light path, keep the water channels clear, reduce humidity within the canopy, and reduce low-light canopy areas, creating favorable conditions for even fruit coloring.
4. During the young fruit stage, use as few pesticides as possible that irritate the peel cells, and at the same time actively promote orchard grass-growing techniques to regulate the supply of soil moisture and nitrogen.
5. When bagging, the bag opening must be tied tightly so that rainwater cannot flow down the fruit stalk into the bag.
6. When removing the paper bags, avoid dry, hot, windy weather and sudden temperature changes.
How do you treat apple fruit shrinkage disease? What spray should be used?
This disease is mainly caused by a lack of the boron element needed for apple tree growth and development in the soil. The flowering period in particular has the highest boron requirement, and timely boron supplementation is crucial for controlling fruit shrinkage disease.
Control methods: 1. Strengthen cultivation management, and apply more fully decomposed organic fertilizer or organic-inorganic biological compound fertilizer containing humic acid. Fertilize according to the ratio of nitrogen, phosphorus, and potassium required for apple tree growth of 2:1:2, and supplement with foliar sprays of Ouyamei or Jindongli Potassium Treasure water-soluble fertilizer rich in nitrogen, phosphorus, potassium, and various trace elements to enhance the tree's disease resistance.
2. Apply boron fertilizer to the soil. In autumn or spring, apply fertilizer according to large, medium, and small tree ages, or according to the trunk diameter at a point 33 cm above the ground: for trunk diameters of 8-17 cm, 23-26 cm, and over 33 cm, apply 50-150 grams, 200-350 grams, and 350-500 grams of 95% borax per tree respectively, spread evenly on the ground within the canopy projection area, then water.
3. Foliar boron spraying. Before and after flowering and during the young fruit enlargement period, spray the whole tree 2-3 times with a 200-250 times borax solution, or 750 times Caluli boron solution, or 300 times Feichang Zinc Calcium Boron solution.