During the whole growth of pepper, a physiological disease, sunburn, often occurs. Sunburn is mainly caused by the strong exposure of the fruit to the sun.
1. The incidence of pepper sunburn
So, what are the causes of the occurrence of chilli sunburn? In general, the bad shading of the leaves is the main cause of the sunburn of peppers. Many farmers have planted too thin or poorly managed during the cultivation of peppers. The capsicum fruit is exposed to the sun, causing local overheating of the fruit, or although the fruit is hidden under the leaf, the scattered light converges to the fruit, causing local overheating of the fruit, and sunburn occurs. In addition, the lack of water in the soil, excessive dry heat in the weather, and heat after the rain are likely to cause sunburn.
2. Symptoms of pepper sunburn
In the early stage of sunburn, the burnt spot is grayish white or light white, and it is leathery. After the surface of the diseased part becomes thinner, the tissue is necrotic and hard. In the later stage, the saprophytic bacteria infects and grows gray and black mold layer and rots. The fruit of the sunburn occurs, and the burning spot occurs mostly in the southwest part of the fruit. This is because during the day, the strongest time of the sun is between 13:00 and 15:00, when the sun is in the southwest. Sometimes the sunburn on the fruit occurs in other parts of the fruit. This is often because there are drops of water on the fruit in the morning or after the rain. The weather suddenly clears. The sun is strong, and the water droplets on the fruit gather and absorb heat, causing sunburn. This type of sunburn is generally small and has no directionality.
3. Prevention and treatment of pepper sunburn
Heat-resistant varieties are used according to local conditions. Decrease the leaf surface temperature. When the sun is shining strongly, partial shading may be used, or a shade net may be used to prevent the temperature in the shed from being too high. Spray water to cool down. When transplanting the field, the double plant is reasonably densely planted, and the dense planting can not only shade, but also reduce the soil temperature, so as to avoid high temperature damage. Intercropping with high-stalk crops such as corn, using the shade to cool down.
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