Occurrence of sunburn in chili

Recently, in the process of going to the countryside, it was found that the current greenhouse pepper (including pepper and pepper) often appears a kind of rotten fruit disease, this disease began to occur in the spring, with the rise in temperature will increase. It is usually the appearance of rot on the side of the fruit, which causes the pepper to lose its commercial value. This disease is easily regarded as a soft rot of pepper or a disease such as umbilical rot or anthrax. This understanding is incorrect. The soft rot usually has a watery rot. In severe cases, the fruit rots only in the skin, as shown below. The right pepper in Sunburn 2 is the fruit of soft rot. However, umbilical rot occurs only in the umbilicus, and anthrax lesions may appear as large depressions.
Symptoms: The rot of the pepper fruit appears on one side. At the beginning, the diseased part appears dark brown, and then the diseased part gradually turns brown. Finally, the diseased part of the fruit turns white, and then slightly enlarges, white or light brown, the cortex is thin, and the tissue is necrotic. After drying, it is susceptible to fungal infestation, and black mold or sclerotia are produced on the rot. When the humidity is high, bacteria infestation occurs and the entire fruit rots. The sun-burning fruit is mainly small fruit or medium-sized fruit, and the large fruit basically does not appear sunburn.
Etiology: Chilli causal disease is mainly caused by the fruit of pepper exposed to sunlight, direct sunlight on the fruit surface, causing local overheating of the fruit; or even though the fruit of the pepper is hidden under the leaf, but due to scattered light or concentrated to the fruit surface It may also cause sunburn damage due to local overheating of fruits. In the morning, a large amount of dewdrops appear on the fruit. After sun exposure, the dewdrop collects light and absorbs heat, which can cause skin cell burns; hot noon or afternoon, insufficient soil moisture, and sudden rain Clear can cause fruit surface temperature is too high, causing sunburn. In addition, when the fruit begins to swell, if the micro-nutrient elements are insufficient, the lightfastness of the peel will be reduced, so that sunburn will occur easily. Other causes, such as poor planting of pepper or improper management, are also prone to sunburn. In addition, the occurrence of sunburn is also related to varieties.
Control methods: (1) Cover with a sunshade net, reduce the temperature inside the booth and avoid direct sunlight, and remove the light curtain and mulch in time with the increase of air temperature outside the shed to reduce the reflection of light. 2 In the case of high humidity season or high temperatures in the shed, we must use small water for pouring, and timely irrigation to supplement soil moisture, so that the water circulation of the plants is in a normal state and prevent the temperature of the plants from rising, so as to avoid sunburn. 3 Shelf room should be ventilated and cooled in time. To regularly spray water to the greenhouse to achieve the purpose of cooling. 4 Properly dense planting, so that the stems and leaves cover each other to avoid direct sunlight on the fruit. 5 After the disease is found, remove it in time to prevent the infection of other pathogens in the wound due to excessive humidity in the shelter. 6 Timely replenishment of trace elements such as calcium, magnesium, boron, zinc, manganese, iron and molybdenum, etc., such as foliar spray of Ruilv or Ruipei Calcium or Ruipeile, etc., or Lvfenwei No. 2 and No. 3 foliar fertilizer, etc., can promote the pepper fruit The ability to resist sunburn reduces the incidence of sunburn. Can also be applied to the greenhouse in Norway, such as Heidelu calcium nitrate fertilization and other nutrients, or flushing and fast absorption to ensure that the soil in the micro-nutrient elements can be absorbed by the roots of vegetables.
(Liu Chunxiang)

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