Winter jujube skin sunburn is a common physiological disease under high temperature and strong light, which seriously affects the appearance and commercial value of the fruit.

If you want to reduce the harm of sunburn, you must first understand the mechanism of the disease and strengthen detailed management based on the cause.

1. Direct damage from high temperature and strong light: When the temperature continues to exceed 35℃, the temperature of the fruit surface can reach above 50℃. This damages the cell membrane structure of the fruit's epidermis, leading to water imbalance and cell death. At the same time, ultraviolet radiation can increase oxidative stress in the peel, destroying chlorophyll and cell wall integrity.

2. Changes in the microenvironment of the fruit surface: insufficient humidity and dry weather accelerate transpiration. The peel loses water and becomes less tough, making it more susceptible to burns from strong light. There are local temperature differences within the fruit because the fruit is heated unevenly at different locations on the branch.

3. Fruit development characteristics: Fruits in the expansion stage are more susceptible to damage than young fruits because of their thin skin, high water content, and large exposed area. When there is a lack of elements such as calcium and boron, the cell wall stability is poor and the ability to resist sunlight is weakened.

Therefore, the following points should be noted in management:

1. Consider shading during periods of high temperatures and strong sunlight: leave shallow grass or straw under the trees to reduce radiation and maintain soil moisture. Remember to spray water in the orchard to increase air humidity.

2. To enhance tree vigor and fruit resistance, apply organic nutrients and trace elements. Monband® MBT PULI-NANO(MBT SUS) is recommended. It quickly replenishes soil organic nutrients and leaves with trace elements, nourishing the root system and strengthening tree vigor. At the same time, water sparingly to replenish soil moisture.