Changzhou Timerein Biotechnology Co. , Ltd. , https://www.timereinbiotech.com
Prevention and cure of grape sunburn
Sunburn on fruits typically manifests as brown or dark brown round spots on the surface, with unclear boundaries. Initially, the fruit skin shrinks and then gradually sinks inward. In severe cases, the affected fruit dries up and becomes inedible. Young shoots and tender stems that haven't fully lignified are also susceptible to sunburn, which can lead to leaf tip dieback or wilting.
The primary cause of sunburn is exposure of the fruit to direct sunlight. This often occurs when trees suffer from water deficiency, leading to an imbalance between water absorption in the roots and transpiration from the leaves. When root water uptake is insufficient, but leaf evaporation remains high, the fruit's internal moisture levels become unstable, resulting in sunburn damage. Additionally, root damage from excessive heat or root burn can contribute to the condition. Fruits that are exposed due to improper pruning, vine movement, or sudden temperature increases are more likely to develop sunspots.
To prevent sunburn, proper orchard management is essential. Deep fertilization should be applied to encourage deeper root development, enhance tree vitality, and improve resistance to environmental stress. Appropriate planting density and the use of trellis systems can help keep fruits in shaded areas. It’s important to avoid waterlogging and over-fertilization, which can weaken the tree. During hot weather, timely irrigation ensures sufficient water supply, reduces plant temperature, and prevents sunburn.
Another effective method is foliar spraying. After the rainy season, during periods of high temperatures, applying a 0.2% potassium dihydrogen phosphate solution or a 5% wood ash leachate to the leaves and fruits can help reduce the risk of sunburn. These treatments not only cool the plant but also provide essential nutrients, enhancing overall resilience against heat stress. Regular monitoring and early intervention are key to minimizing damage and ensuring healthy fruit development.
Next Article
Yunnan smile
Prev Article
Prevention and cure of grape sunburn