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

The apple planting area in our country is very large, and many people love eating apples, so the market demand for apples is very great. Nowadays more and more people are growing apples, but when growing apples, fruit russeting is often prone to occur, 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 give everyone a brief introduction, let's take a look together!

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 relatively large impact 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 then extremely prone to fruit russeting. At the same time, besides the reason of its own poor development, other reasons such as unsuitability to the environment and poor stress resistance will also aggravate fruit russeting, causing the ornamental value of apples to decline 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, the development of the fruit skin will also be affected, forming a relatively severe russeting phenomenon. Another reason is axillary flower buds; at this time, flower buds formed through lateral buds of vegetative branches are affected by the growth vigor at the apex. Therefore, axillary flower buds form later than terminal flower buds, leading to poor nutrition and the occurrence 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, we should also combine an appropriate amount of medium and trace elements, applying them early and in sufficient amounts. Then during the growing season, the amount of fertilizer applied should be well controlled; it is best to be able to formulate fertilizer based on soil testing 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 timely renewal, 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 the fruit, 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 fruits set on side flowers, so as to avoid exceeding the load. Adopt reasonable flower-promoting measures, and do not ring-bark the trunk. For young vigorous trees, around the middle of May each year, carry out ring-cutting on the main branches. 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 and control measures of apple fruit russeting. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!