How to Prevent Heat Damage in Grapes? A Detailed Guide to the Latest Control Techniques

During grape cultivation, many problems are encountered, such as pests and diseases, fruit drop, and uneven berry size. These problems are all very harmful to grape growth. They have a great impact on yield and quality, and heat damage is one of them. Heat damage scorches the fruit and the vine. It leads to fruit cracking, fruit drop, and so on. So how do we prevent heat damage in high-temperature weather, especially in summer? Let's take a look together below!

1. Watering

Heat damage generally occurs in summer, because summer temperatures are the highest of the whole year. When the temperature is too high, the speed of water evaporation also becomes faster. A lack of water in grapes causes the grape leaves to gradually turn yellow, affecting photosynthesis. At this time, we need to water the grapevines appropriately to replenish the water needed for growth. Try to avoid watering when the temperature is high, such as at noon. Morning or evening is the best time to water. Sufficient water can ensure normal coloring of the grapes and prevent abnormal ripening.

2. Topdressing

The occurrence of heat damage is closely related to nutrient deficiency in the grapevine. Proper topdressing can enhance the resistance of the grapevine. When fertilizing, pay attention to the amount of fertilizer used. Decide the appropriate nutrient ratio of the fertilizer according to the condition of the vine. When topdressing, do not apply a single fertilizer excessively or partially, especially nitrogen fertilizer. Nitrogen fertilizer will cause excessive vegetative growth of the branches. Not only can it fail to prevent heat damage, it may even aggravate the degree of heat damage. Therefore, we should fertilize reasonably, applying fertilizer according to the vine's nutrient deficiencies, and simply replenish the fertilizer needed for growth.

3. Leaf thinning

Everyone knows that leaf thinning is a very important task in grape growing, especially in summer. However, in weather with relatively high temperatures, leaf thinning needs to be done as appropriate. This is because a proper density of branches can effectively shade the fruit and the vine from sunlight. So we carry out shaping and pruning of the vine according to the tree shape, growth vigor, and so on. As long as strong air and light penetration in the orchard is ensured, that is enough. Absolutely do not thin the leaves excessively. Otherwise, too few leaves will affect the tree's photosynthesis, leading to insufficient nutrition, the appearance of yellow leaves, and a higher incidence of pests and diseases.

4. Bagging

Nowadays, bagging is basically essential work for every fruit grower, and this is especially true for grapes, because bagging grapes can effectively prevent heat damage and other non-physiological diseases such as sunscald. When the fruit is at the young fruit stage and has not yet fully ripened, bag it in time, and try to bag it before the temperature has risen. Do not do it when the temperature is relatively high. After bagging, strengthen orchard management, water and topdress in time, and do a good job of pruning the vine, and so on. This can reduce heat damage caused by high temperatures.

The above four points are the control methods for preventing heat damage in grapes. Heat damage is extremely harmful to grapes. Causing reduced yield is still a mild outcome; in severe cases, it may lead to total crop failure. Therefore, during cultivation, we should strengthen orchard management and make good preparations for responding to all unexpected situations. Increase grape yield and boost one's own economic benefits. That is all for today's introduction. If you want to learn more related information, please continue to follow us!