Detailed Explanation of the Latest Prevention and Control Measures for Grape Sunburn

Grape sunburn is a physiological disease that mainly occurs during the young berry expansion stage, which is precisely the period of high temperature and intense light. When the grape clusters lack shade, strong light radiation mainly causes water loss and scorching on the berry skin. So how should grape sunburn be prevented and controlled? Let's take a look at the introduction of prevention and control measures.

1. Damage symptoms

It mainly occurs on the fruit clusters. After being damaged, light brown patches appear on the surface of the berries and gradually spread into sunken dry scars, stopping before the fruit ripens. Sunburn generally occurs during the young fruit stage and the fruit expansion stage. At first, the berries show water loss, sunken areas, and light brown patches. As the disease worsens, the lesions gradually expand until the surface tissue of the fruit loses water and the lesions dry up.

2. Causes

During periods of high temperature and intense light, fruit clusters lacking shade from leaves will cause the parts of the fruit exposed to light to suffer water loss and scorching, or it may be caused by leaves and fruit competing for water. Poor vine vigor in grape cultivation, poor root growth, small and few leaves, and uneven fertilization can also cause grape sunburn. In addition, the occurrence of sunburn is also closely related to the grape trellis system, vine vigor, the orientation of fruit clusters and the fruit load, the timing of bagging, and fruit bag quality management. Fruit clusters growing on the sun-facing side suffer more severe sunburn; late bagging also aggravates sunburn; and excessive fruit load also aggravates sunburn.

3. Prevention and control measures

Choose a reasonable planting density and adopt a trellis system so that the fruit clusters grow in shaded areas and avoid direct exposure to strong light. Apply appropriate topdressing during the growing season to strengthen vine vigor and improve the stress resistance of the grape plants. During the rainy season, take good drainage and dehumidification measures to avoid waterlogging and root rot. Pay attention when fertilizing to avoid excessive fertilization or overly concentrated fertilizer causing root burn in the grape plants. In hot weather, increase watering and spraying to lower the plant temperature. At the same time, you can also spray Guotidingling plus Xingaozhimo to improve grape coloring and avoid sunburn. The timing of bagging must be appropriate to reduce scorching of the fruit by strong light. In addition, the choice of bags must be waterproof, white, and highly breathable.

The above is an introduction to the prevention and control measures for grape sunburn. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.