Prevention and treatment of apple leaves blackening:
1. Timely prevention and control of pests and diseases
Protecting the leaves The main pests and diseases in August are brown spot, Hawthorn red spider, white spider (two-spotted spider mite). Brown spot disease occurs lightly, and some orchards are neglected in the prevention and treatment of the disease. It is estimated that it will occur seriously in late August, and fruit farmers should not be taken lightly.
2. Grasp the summer shears, ensure that the trees are ventilated and transparent, and clean up the internal organs, the back and the peripheral erect branches, and the long branches.
Shrink the cross branches, mop the branches, and over the branches. Severe excessive side branches on large branches. If the line is handed over, retract to the ideal branch at the back and open the line. In short, after the summer cut, it is necessary to ensure that the tip does not touch, the leaves are not worn, the branches on the tree are smooth, and the underground plum blossom shadow makes the light transmittance of the crown reach over 30%.
3. Strengthen fertilizer and water management
Strengthening the tree into August, it is the fruit expansion period of late-maturing varieties, and also the flower bud differentiation stage. In order to ensure the nutrient needs of the tree, the ternary compound fertilizer or urea, diammonium phosphate and potassium sulfate mixed fertilizer are applied underground. The weak attention of the tree should increase the amount of nitrogen fertilizer appropriately, and the ratio of nitrogen, phosphorus and potassium should be 1:0.6:0.8. After the fruit was harvested last year, the phosphate fertilizer was applied. This time, only the quick-acting nitrogen fertilizer and the potassium fertilizer can be applied. The specific dosage can be flexibly controlled according to the amount of load and the situation of the tree.
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