Symptoms The top of the fruit (umbilicus) is immersed in water, and the diseased part is dark green or dark gray. It quickly turns dark brown as the disease progresses. The flesh loses water, the top is sag, and generally it does not decay. When the air is wet, the disease is often caused by certain symptoms. The fungus is rotted.
Etiology A widely accepted view is that the underlying cause of the disease is calcium deficiency. The soil base is low in content and acidified, especially in the soil with large sand, which is insufficient for calcium supply. In salinized soils, although the soil contains more calcium, due to the high concentration of soluble salts in the soil, the absorption of calcium by the roots is hindered and calcium deficiency is also caused. The application of ammonium nitrogen fertilizer or excessive potassium fertilizer will also hinder the plant's absorption of calcium. When the soil is arid, air is dry, and continuous high temperatures occur, large amounts of rot are likely to appear. Another view is that the main cause of the disease is the imbalance of water supply. Under drought conditions, insufficient water supply, or sudden drought and moisture, impedes the water absorption of the roots of the pepper. Because of the large amount of transpiration, the original water in the fruit is taken away by the leaves, resulting in a large amount of water loss, fruit necrosis, leading to disease.
Control methods
1Scientific fertilization In the soil with strong sand, decompose chicken manure should be applied to each soil. If acidification occurs in the soil, a certain amount of lime should be used to avoid large-scale application of ammonium nitrogen and potassium fertilizers.
2 Equilibrium water supply The soil moisture content cannot change drastically, otherwise it will easily cause umbilical rot and fruit cracking. In rainy years, water should be properly watered to prevent sudden increase in soil moisture during rain. Drain the water immediately after the rain to prevent the accumulation of water in the field for a long time.
3 After the leaf calcium supplement enters the result phase, spray 0.1-0.3% calcium chloride or calcium nitrate solution once every 7 days, 2-3 times per week. Continuous spraying of calcium fertilizer such as Green Fenway No. 3 can also be used, and the effect is very good, which can prevent the occurrence of umbilical rot.
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