Detailed Explanation of the Causes of Fruit Cracking in Fujiminori Grapes and Control Measures

Fujiminori grape is a relatively popular variety among grapes. Its fruit is large and sweet, rich in juice, and the berries are large, making it highly prone to fruit cracking. After cracking, in hot and humid seasons it quickly becomes infected with other diseases and rots, causing economic losses. So what causes fruit cracking in Fujiminori grapes? How should it be controlled? Let's take a look together.

I. Causes of fruit cracking

1. Drastic changes in moisture

During fruit development, fruit cracking caused by drastic changes in soil moisture occurs because in summer, when temperatures are high and evaporation is great, the soil dries out very easily and moisture is insufficient. If heavy rain suddenly falls or flood irrigation is used, the roots absorb a large amount of water and transport it to the flesh cells, causing the flesh cells to rapidly expand after absorbing water. Since the skin cannot keep up with the expansion rate of the flesh, the skin ruptures.

2. Improper management

If the fruit cluster is infected with powdery mildew, the skin will also be damaged and fruit cracking will occur. If the plant sheds its leaves early, transpiration is reduced, and a large amount of water in the tree flows to the berries, increasing the turgor pressure of the berries, so that the skin cannot bear it and cracks.

II. Control methods

1. Regulating moisture

Stabilizing and balancing soil moisture is the most fundamental measure to prevent grape fruit cracking. Especially during the sensitive period for fruit cracking, attention must always be paid to changes in soil moisture to prevent drastic fluctuations. The soil surface of the grape orchard should not turn white and should remain moist at all times. Water promptly during drought, but pay attention to the amount of watering; it is not advisable to water too much at one time. After the rainy season, when sunny days return, irrigate continuously for several days to fight drought. At this time, the irrigation amount should be sufficient, with water covering the bed surface, until the berries begin to absorb it. Alternatively, pay attention to the weather forecast and irrigate well before heavy rain arrives, which can effectively reduce the degree of fruit cracking. It is also possible, when entering the high-temperature season, to lay a 5-10 cm thick layer of rice straw on the bed surface, which can provide an excellent moisture-retaining effect.

2. Strengthening cultivation management

Strictly carry out shaping of flower clusters, flower thinning, and fruit thinning, to avoid fruit clusters pressing against each other due to overly dense growth, strengthen disease control measures, and protect the photosynthesis of the leaves. Increase the application of phosphorus and potassium fertilizers; especially applying phosphorus and potassium fertilizers during the pit-hardening stage can reduce fruit cracking. After the first physiological fruit drop, spraying growth regulators can significantly reduce fruit cracking.

The above is an introduction to the causes of fruit cracking in Fujiminori grapes and control measures. We hope it can help you. To learn more related knowledge, please stay tuned to us.