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Why does kiwifruit suffer from early deciduous disease
Answer: The early defoliation disease mainly damages young leaves in the kiwifruit tree, and also harms the twigs. The disease has obvious symptoms in the leaves in July and August. A small white spot appeared on the tender leaves, and then turned into a brown dot. Some indistinct mold spots appeared on the back of the leaves. In the case of high-temperature and high-humidity disease, the patch expands faster, causing the lesion to fade from brown, and the damaged leaf is involute or broken, leading to early shedding. In general, the planting density is too large, the number of branches left is too high, and the crown canopy is closed; without application of organic fertilizer, a large amount of nitrogen fertilizer is applied without paying attention to the combination of nitrogen, phosphorus and potassium; and the incidence of orchard with high groundwater level is heavy. The hot and humid climate conditions are the basis of the disease. Poor management is the objective condition for the early occurrence of the disease.