Sweet peppers in greenhouses often show signs of rot. For such cases, growers generally treat them as rot. Recently, when the author went to the countryside, he also discovered this kind of rotten fruit disease, but it is a sunburn disease, not an umbilical rot. The vegetable farmers must distinguish clearly.
Sunburn is mainly due to direct sunlight on the fruit surface or the morning shed film, dewdrops appear on the fruit, the sun shines on the top of the concentrated heat, causing skin burns. Umbilical rot is mainly due to the reduction of mobility of calcium in the soil caused by high temperature and drought, the ability of roots to absorb calcium, and a physiological deficiency caused by temporary calcium deficiency in fruit. The disease occurs in batches of fruit. .
In the initial stage of general scorch disease, the diseased part appears dark brown and gradually turns brown. Finally, white, cortical thinning, tissue necrosis, drying, susceptible to fungal infection, rot on the black mold; umbilical rot, the diseased part appears dark Green water stains, after the expansion, shrinkage, depression, often black or decay due to other parasitic bacteria. The sunburn disease usually occurs on the sunny side of the fruit, while the umbilical rot disease mostly occurs in the umbilical part of the fruit.
In the prevention and treatment of sunburn, the sunshade net should be installed on the shed first, and the light curtain and mulch film should be removed early to reduce the reflection of light. Second, we must diligently pour water to reduce the temperature inside the shed. In addition, they must be planted in close proximity so that the stems and leaves can be sheltered from each other and the fruits can be exposed to direct sunlight. And timely addition of trace elements such as calcium, magnesium, boron, zinc, manganese, iron and molybdenum, etc., to improve plant resistance.
In the prevention and treatment of umbilical rot, it is necessary to prevent excessive drought within the shed, often pouring small water, and promote the normal absorption of calcium in the soil by the root system. And in the set fruit and fruit expansion period, leaf calcium supplement can effectively alleviate the disease.
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