Prevention of Sunburn Disease in Summer Pepper

Prevention of Sunburn Disease in Summer Pepper

Sunburn, also known as sunburn, is a common disease in color bell peppers. It occurs more often in the summer and occurs with sporadic disease when it is light. Severe illness can be up to 30% or even higher.

Symptoms: Both young and mature fruit can be affected. The sunny side of the fruit is burned by the sun, and it is greenish at the beginning. Afterwards, the flesh of the diseased part loses water and thins, forming a shiny, almost transparent, leathery texture. Then the diseased part expands, sinks slightly, and tissue necrosis becomes hard and easy to break. The diseased part is susceptible to germs, grows black or pink mold, and even rots.

Cause: The disease is a physiological disease. Mainly due to poor shading of the leaves, the fruit was exposed to strong direct sunlight, which caused the temperature of the skin to rise. A large amount of water evaporates, causing the local temperature of the fruit surface to rise and burn. In general, the greater the temperature difference between the sunny side and the shady side of the fruit, the heavier the disease. Cultivation of color bell peppers in the spring, fruit swelling and harvest season coincides with mid-summer and early autumn, such as soil water shortage, poor shading of the leaves, the weather continues to dry and hot, or rain, dew, fog days after the storm hot, easily lead to the disease. Planting too thin, lack of water and fertilizer, poor plant growth, disease and insects caused by lack of plants, or early defoliation of plants, the incidence is heavier.

Control methods: (1) Properly increase the planting density according to the variety characteristics. (2) Intercropping with high stalk crops or shade planting with shade nets. (3) Increase phosphorus and potassium fertilizers to promote fruit development. During the fruiting period, timely and uniform watering to keep the ground moist to reduce the incidence. (4) Prevent pests and diseases in time to prevent early defoliation due to pests and diseases.

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