What are the causes of apple fruit russeting and the control measures?

Apple cultivation area in China is very large, many people like eating apples very much, so the market demand for apples is very large. Now more and more people are growing apples, but when growing apples, fruit russeting often occurs easily, causing apple quality to be seriously affected. So what are the causes of apple fruit russeting? And how should it be controlled? Below, the editor will briefly introduce it for everyone, let's take a look!

I. Causes

1. Poor flower bud quality

The main cause of apple fruit russeting may be poor flower bud quality. The time when flower buds form has a great influence on flower bud quality. If some flower buds form relatively late, they are prone to poor nutrition, leading to poor flower bud quality. Fruit set from such flower buds is extremely prone to fruit russeting. At the same time, in addition to its own poor development, factors such as poor adaptation to the environment and poor stress resistance will also aggravate fruit russeting, causing a decline in the ornamental value of apples and reducing planting benefits.

2. Other causes related to flower buds

If flower buds form on autumn shoots that sprout after the spring shoots of the apple tree stop growing, their differentiation time is very short. The nutritional conditions are also very poor, leading to poor flower bud differentiation and delayed flowering time. At the same time, after fruit set, peel development will also be affected, forming a more severe russeting phenomenon. Another reason is axillary flower buds. At this time, flower buds formed through the lateral buds of vegetative shoots are affected by the growth vigor at the apex. Therefore, axillary flower buds form later than terminal flower buds, resulting in poor nutrition and the appearance of fruit russeting.

II. Control

1. Comprehensive measures

First, we must improve flower bud quality. In autumn, we should focus on applying base fertilizer and appropriately increase the application amount of organic fertilizer and biological bacteria. At the same time, it should be combined with an appropriate amount of medium and trace elements, applied early and in sufficient quantity. Then during the growing season, the amount of fertilizer applied should be well controlled. It is best to carry out soil testing and formula fertilization, and integrate water and fertilizer to maintain a balanced supply. At the same time, pruning work should also be done well to maintain good tree vigor, carry out renewal at the proper time, improve space utilization, and ensure ventilation and light penetration. Then, according to a reasonable control plan, do a good job in pest and disease control and protect fruits, leaves, and so on.

2. Strengthen management

At the same time, we should also strengthen flower and fruit management, promote fruit set from high-quality flower buds, ensure the fruit-setting rate in the center of the tree, and then promptly thin out weak flowers and side flowers that set fruit, so as to avoid exceeding the load. Adopt reasonable flower-promoting measures, and do not girdle the trunk. For young vigorous trees, ring-cut the main branches around the middle of May each year. Then bag the fruit, and then spray foliar fertilizer rich in medium and trace elements, about three times. Then in August, spray an appropriate amount of organic phosphorus and potassium fertilizer, reasonably regulate fertilizer and water, promote flower bud differentiation, and improve flower bud quality.

The above is a brief introduction to the causes of apple fruit russeting and the control measures. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!