Causes and Control methods of rotten Apple Fruit

Apple is one of our common fruits. China is the largest producer and consumer of apples in the world, accounting for more than 40% of the total planting area in the world. The larger the planting area, the more problems there are, in which rotten apple fruit is a more common phenomenon, which affects the yield and quality of apples. So what is the cause of apple rotten fruit? Let's take a look.

1. Disease

The main cause of apple fruit rot is disease, and a variety of diseases will cause its rotten fruit, including ring rot, black rot, anthrax, brown rot, blight rot and so on. The symptoms of fruit rot caused by these diseases are also different, such as ring disease, there are wheel-like disease spots on the fruit surface, with the development of the disease, the disease spots expand, and cause rot, black rot caused fruit rot, the rot is black.

Prevention and control methods: to strengthen orchard management, many diseases are through bacteria after overwintering, continue to harm in the coming year, so leading to the outbreak of diseases year after year. Clean the orchard thoroughly after harvest, burn or bury the weeds and debris, fallen leaves and residual branches in the orchard, and then take the disease and insect branches, broken branches and dry and withered branches out of the orchard and burn them out of the orchard to reduce pathogens. After finding the disease, the diseased fruit should be removed in time, so as not to spread to other healthy fruits, and the chemical should be sprayed for control.

2. Excessive girdling and overweight

Many fruit growers mistakenly believe that apples can not achieve the purpose of high yield without girdling, so they peel the trees many times, not only on the main branches, but also on the auxiliary branches. In addition, factors such as not applying fertilizer in time and improper fertilization lead to the weakness of the tree, giving bacteria and microorganisms an opportunity to rot and fall off the fruit. According to practical production, the rotten fruit rate of weak trees can reach 50%, while the rotten fruit rate of strong trees is only less than 10%.

Prevention and control methods: excessive girdling should not be carried out in management, but should be carried out reasonably according to tree growth and fruit quantity. After girdling, organic fertilizer and other fertility should be applied in time, plant nutrition should be supplemented, disease resistance should be improved, disease should not be taken advantage of, and strong trees should be cultivated to reduce fruit cracking rate.

3. High planting density

The rotten fruit is mainly due to the invasion of bacteria from lenticels and wounds. In order to increase the yield, some fruit growers lead to high planting density, poor permeability between plants, large number of branches and closure between rows. This environment is very easy for bacteria and microorganisms to survive and multiply. And the spray treatment of this environment is poor, the fruit surface can not be evenly applied, leaving a chance for bacteria and microorganisms to infect, resulting in rotten fruit.

Prevention and control methods: reasonable planting, timely pruning, pruning some weak branches, diseased branches and dense branches, increasing the permeability between plants, and spraying to inhibit the growth of bacterial microorganisms.

4. long-term overcast and rainy weather

If you encounter long-term overcast and rainy weather during the fruit expansion period, it will cause the root system to absorb a large amount of water, which will be transported to the fruit, and the fruit will expand rapidly, resulting in fruit cracking, Rain Water's intrusion and bacterial invasion, and the fruit will become split. And after Apple bagging, this phenomenon can not be avoided.

Prevention and control methods: in overcast and rainy climate, drainage and waterlogging prevention measures should be taken to avoid excessive water absorption of plants, and high-quality bags with good hydrophobicity, good permeability and good quality should be selected when bagging.

The above are the causes and control methods of rotten apple fruit. I hope it can help you. If you want to know more about apple planting, please follow us.