What to do if potted grapes drop fruit

Physiological fruit drop of grapes

Physiological fruit drop is actually a normal phenomenon. When the grape berries grow to 3 or 4 mm, some of them will stop growing and begin to fall due to poor fertilization and malnutrition. This is physiological fruit drop. This is a natural phenomenon. The competition for nutrients between the berries will not have any bad effects. Instead, it can improve the quality of the grapes.

However, when the fruits fall, in order to prevent the grapes from falling in large quantities, the growth of new shoots must be controlled.

Grape burns and fruit drop

As the grapes grow, the berries gradually mature. When the temperature reaches 35°C, if they are exposed to direct sunlight, the fruits are likely to become diseased, turn black and shrink. This may be because too much nitrogen fertilizer was applied in the early stages of growth, causing lush branches and leaves, so sunburn was more serious.

In summer, the potting soil should be properly trimmed, branches that can provide shade should be retained, and some branches should be cut off. If it is potted, paper bags can also be placed on the fruit to provide shade.

Grape pests and diseases

Grapes often suffer from diseases. When the temperature is high and there is a lot of rain, they are prone to diseases such as powdery mildew, anthracnose and downy mildew. These diseases will cause the grapes to drop. In order to prevent and control these diseases, pesticides can be used for prevention and control. In winter, some overwintering pathogens must be eliminated as early as possible.

When grapes are attacked by insect pests, fruit drop will occur. For example, if pests such as red spider mites are not controlled in time, fruit drop will occur. Pay attention to high temperatures and dry weather, and spray with pesticides in a timely manner.