Prevention and control measures of grape sunburn

Grape sunburn is a physiological disease, which mainly occurs in the period of young fruit expansion, when there is a period of high temperature and strong light, when the grape ear is lack of shade, the strong light radiation mainly leads to the phenomenon of water loss and burn on the epidermis of the fruit. So how to prevent and cure grape sunburn? Let's take a look at the introduction of prevention and control measures.

1. Harmful symptoms

It mainly occurs on the ear, and light brown patches appear on the surface of the damaged fruit, which gradually spread into sunken dry scars and stop occurring before the fruit ripens. Sunburn generally occurs in the young fruit stage and fruit expansion stage. At the beginning, the fruit is characterized by water loss, depression and light brown patches. With the severity of the disease, the disease spot will gradually expand until the water loss of the fruit surface tissue leads to the disease spot drying.

2. The cause

In the period of high temperature and strong light, the lack of leaf shade in the ear can lead to water burns in the parts of the fruit exposed to light, or the competition for water between the leaves and the fruit. Grape planting tree potential is poor, root growth is poor, fewer leaves, uneven fertilization will also cause grape sunburn disease. In addition, the occurrence of sunburn is also closely related to grape frame type, tree strength, ear position and fruit quantity, fruit bagging sooner or later and fruit bag quality management factors. Ears grow to the sun, sunburn occurs more seriously, bagging late will also aggravate sunburn, as a result, too much will also aggravate sunburn.

3. prevention and control measures

Choose a reasonable planting density and use a scaffolding to make the ear grow in a cool place and avoid direct exposure to strong light. In the growing period, appropriate topdressing, enhance the tree potential, improve the stress resistance of grape plants, drainage and humidity reduction measures should be taken in the rainy season to avoid waterlogging and rotting roots. Attention should be paid to fertilization so as not to cause grape plants to burn roots due to excessive fertilization or excessive concentration of fertilizer, which can increase watering and spray water to reduce plant temperature in high temperature weather, and at the same time, fruit tiling can be sprayed with new high-fat film to improve grape coloring and avoid sunburn. Bagging time must be appropriate to reduce the strong light on the fruit burns, and bagging must choose waterproof, white, good air permeability.

The above is the introduction of grape sunburn prevention and control measures, hope to help you, want to know more related knowledge, please follow us.