Strengthen water and fertilizer management During the fruit enlargement period, appropriate application of compound fertilizer, or combined application of nitrogen, phosphorus, and potassium, but the amount of nitrogen fertilizer is not easy to be excessive, 0.2% to 0.3% of potassium dihydrogen phosphate plus 0.1% before spraying on physiological fruits. The boric acid solution can reduce 50% to 60% of fruit drop. When the weather is dry, it is necessary to water in time and the water in the park will be drained in time after the rain.
Prevention and treatment of pests in summer with high temperatures and high rainfall is a high incidence period of pests and diseases, such as early defoliation, anthrax, leaf roller moth, red spider, etc., must be strictly prevented. The disease can be sprayed with thiophanate 600-800 times solution, carbendazim 500-600 times solution, Dailin Zinc 500 times solution and 1% Bordeaux mixture. For pests, dichlorvos 1000 times solution, dipterex 800 times solution, enemies kill 2000-3000 times solution, and dimethoate 1500 times solution are used for spraying.
Spraying hormones: Apples spray 50 ppm naphthlenic acid for 30 to 15 days before harvesting; or spray 2000 ppm B9 for 60 to 40 days before fruit picking, not only can reduce fruit drop, but also promote fruit coloring and increase hardness. Improve storage stability.
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