The main cause of apple bitter bean disease is the lack of calcium in the soil and the lack of tree body absorption. The improper application time of ammonium nitrogen fertilizer and potassium fertilizer and the excessive use of apple fertilizer affect the absorption of calcium in the soil. The tree vigor is prosperous and the fruit grows. Too large, the calcium concentration in the fruit is too low. Prevention and control measures: Increase organic fertilizers and calcium-containing fertilizers, such as green manure, livestock manure, superphosphate, and lime. Maintain moderate tree vigor and reasonable load, control the amount of fertilizer and water, to avoid too much fruit; in mid-June, mid-July and mid-August, spray 0.5-% calcium nitrate solution 2 or 3 times, or spray 300 ~400 times liquid amino acid calcium fertilizer.
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