How to prevent apple spotted defoliation, is it really important?

Apple leaf spot is a disease caused by fungal infection, which is very common in China's apple producing areas, which seriously affects the growth of apple trees, flower bud germination, fruit expansion, and the yield and quality of the next year. The lack of clear understanding of the occurrence law and applicable factors of diseases, and the widespread existence of unreasonable drug types and service periods, will not only lead to the failure of disease prevention and control, but also increase the cost of drugs. Many apple-growing areas are old-growing, with fruit trees more than a decade or decades old.

They have long used excessive amounts of chemical fertilizers in pursuit of high yields, while neglecting the health of the trees themselves. Fruit trees produce a certain amount of fruit every year and extract a lot of nutrients from the tree. The severe lack of organic fertilizers leads to nutrient imbalance, insufficient nutrient supplementation of fruit trees, weak trees, and poor resistance.

Apple mosaic disease usually starts in a few branches and then spreads throughout the plant. His symptoms were mainly focused on the leaves. However, due to the differences between different varieties and varieties, the symptoms are slightly different, mainly including moths, tepals, listerias, dot rings and marginal species.

The type of tepal and flower is most evident in production.

<> early defoliation of apple trees usually refers to the phenomenon of apple trees falling off leaves before the defoliation period, early defoliation is not a single disease, but a general term for a class of diseases, including apple brown spots, gray spots, spot leaf litter, ring dots and dots. The most common and serious diseases are apple spotted leaf litter and apple brown spot. Diseased leaves usually have scotomas or concentric wheel patterns in the center.

When the humidity is high, dark green to black mold will grow before and after the diseased plant. In summer and autumn, the heat and humidity lead to rapid onset, resulting in perforated or fragmented leaves, dry scorching and falling off. Infected young fruits have small bright spots or rust spots on the surface, and the damage is limited to the skin of the diseased fruit, but sometimes the surface flesh spreads.

At present, the early defoliation found in apple production is mainly caused by pests and diseases and nutrient deficiencies, mainly by brown spot, local leaves and anthrax leaf pests. The year of occurrence is mainly concentrated from July to September each year, but the time is also related to climatic and environmental conditions. In general, in years of high temperature, high humidity and heavy rain, the peak of the incidence will be earlier.

If you want to prevent this disease, you can check some lime in the soil, you can also turn the land deep in the winter, bask it in the sun for a few days, or you can shoot it and sprinkle some suitable pesticides to prevent such diseases from appearing in apple trees. And this control method is also very important, if not done well, it is likely to lead to disease of apple trees and lead to a large area of yield reduction, resulting in very large economic losses.

Yes, it is especially important so that you get a very good planting and you end up with a very good harvest.

Yes, this is really important, and it is necessary to ** this disease of apples in time, otherwise the yield of apples will decline, the fruit will not grow big, and there will be spots.

If the apple has spotted defoliation, the solution is:

Spotted defoliation disease is severe in the spring shoot period (late April to late May) and autumn shoot stage (late June to mid to late July); Brown spot disease can occur from June to August, and the peak incidence is from July to August. Practice has proved that the prevention of initial infection through spraying is very important to control the onset of later infection.

Generally take AIn previous years, orchards with mild disease were diluted and sprayed with 200-300 liquid of "Liang Guo'an"; b.In previous years, orchards with mild disease were sprayed with 300 times of "Liangguo'an" + 600 times (Wo-Fengsu); From 7 to 10 days after flowering until the fruit ripening period in November, it is necessary to insist on spraying once every 10 15 days to protect the leaves and prevent infestation.

Focus on the protection of spring shoot leaves, according to the rainfall conditions, from 10 to 15 days after the fall of flowers, spraying 3 5 times, each time with an interval of 15 20 days. The agents with better effects are: 50% promethane wettable powder or 10% polyoxymycin 1000 1500 times solution, 70% aluminum triethylphosphonate and mancozeb mixture 800 times solution, or 70% mancozeb wettable powder 500 times solution.

The specific fungicides for the prevention and control of spotted defoliation are: 10% polyoxymycin 1000 times, 50% promethexin 1000 times, 10% Shigao 4000 times of the cavity, 400 times of grinding blind uninmycin, 2000 times of 25% tebuconazole, any of the above agents mixed with the fertilizer mixture "Guobao", can receive twice the result with half the effort.

Apple spotted defoliation, also known as brown streak disease, mainly harms leaves, causes early fall, and also harms new shoots and fruits, affecting tree potential and yield, and occurs in all apple producing areas, with Bohai Bay and the Yellow River being more seriously affected.

It is mainly harmful to apple spotted defoliation, also known as brown streak, which occurs in all apple producing areas, and is more seriously affected in the Bohai Bay and the Yellow River Ancient Road area. Apple leaves are an important disease of marshal apples such as the new red star. It causes early defoliation of apples, causing tree weakness, reducing fruit yield and quality, and is also easy to be infected with other germs during storage, resulting in rot.

1. Strict quarantine: try not to introduce seedlings and scion from the sick area.

2. Strict garden cleaning: Carefully sweep away fallen leaves, cut off diseased branches, and burn and bury them in autumn and winter. Spray 100 times of 40% Fumei arsenic wettable powder before germination to eradicate the source of disease.

3. **Forecast: It can be monitored with a spore trap. The practice is to coat petroleum jelly with a glass slide, hang it on a tree branch with a rope, be at a distance of meters from the ground, hang 5 pieces according to the four corners and center of the plot, change it once every 3 days, and remove it for examination under the microscope.

On the fourth day of the peak spore day, the size of millet grains in lesions was visible. On the seventh day after the peak day, the first lesion is found in the field, which should be treated with pesticides.

4. Pesticide prevention and control: focus on protecting early leaves and based on prevention. The first spray should be done in mid-May, 7 days later, the second spray, and another spray in the middle of the month.

The first spray of carbendazim was 800 times, and seven days later, mancozeb was sprayed 1,500 times. After controlling, spray Bordeaux liquid 300 times, and then spray Bordeaux liquid every ten days. aqui te amo。

Prevention and control measures for apple spotted defoliation: (1) Agricultural control: pruning diseased branches in late autumn and early winter, removing fallen leaves, and concentrated burning. Strengthen cultivation management, prune long branches in summer, and improve ventilation and light transmission. Reasonable fertilization, enhance tree strength, improve disease resistance.

2) Pesticide control: 10 15 days after flowering, spray 3 5 times, each time with an interval of 15 20 days. Commonly used agents and multiples:

30% green debao glue suspension 300 500 times liquid, 70% mancozeb wettable powder 400 600 times liquid, 50% promethane wettable powder 1000 1500 times liquid, 50% Suclin wettable powder 2000 times liquid, 75% chlorothalonil wettable powder 800 times liquid.

Summary. We must do agricultural control, weeding the apple tree in time, exposing the sealed branches to it, improving the effect of ventilation, and cleaning up the leaves in time after falling leaves, otherwise, there will be many insects attached to the apple tree. If the apple has spot disease, it will harm its leaves, causing the leaves to fall early, and also endanger its fruit, some effective methods should be used to remove spot defoliation, spot defoliation is also a particularly common disease, each apple producing area will also have spot defoliation, will cause the yield of apples will decline, will also cause apple rot, apple its surface will appear brown dots, and then it will become reddish-brown, and the surface of the apple will also have dark green mold.

What medicine is good for apple spot defoliation?

We must do agricultural control, weeding the apple tree in time, exposing the sealed branches to it, improving the effect of ventilation, and cleaning up the leaves in time after falling leaves, otherwise, there will be many insects attached to the apple tree. If the apple has spot disease, it will harm its leaves, causing the leaves to fall early, and also endanger its fruit, some effective methods should be used to remove spot defoliation, spot defoliation is also a particularly common disease, each apple producing area will also have spot defoliation, will cause the yield of apples will decline, will also cause apple rot, apple its surface will appear brown dots, and then it will become reddish-brown, and the surface of the apple will also have dark green mold.

Pharmaceutical prevention and treatment of drug protection and **, such as polyantimycin wettable powder 400 times; Dasheng wettable powder 800 times; Polyannal wettable powder 2000 times; Promethine wettable powder 1200 times.

We are happy to answer for you: brown spot disease in apple trees is a common disease, which is mainly manifested by round or irregular brown spots of different sizes on the leaves, which can lead to early defoliation of the leaves in severe cases, affecting fruit quality and yield. Here's how to prevent it:

1.Planting disease-resistant varieties: Choosing disease-resistant varieties for planting can reduce the incidence of diseases.

2.Strengthen cleaning management: keep the orchard clean, and clean up fallen leaves, dead branches and diseased residues in a timely manner to reduce the breeding and spread of germs.

3.Reasonable fertilization: Appropriate fertilization to avoid excessive fertilization that causes excessive growth of apple trees and increases the risk of susceptibility.

4.Spraying pesticides: spraying suitable fungicides in the early stage of the disease can effectively control the development of diseases.

It should be noted that the use of the agent should be used in accordance with the requirements of the label instructions, and safety should be paid attention to during the prevention and control period to avoid harm to the environment and the human body.

<> due to the low temperature frost damage in early spring and the recent high temperature and rainfall, it is conducive to the infection of early defoliation disease of apples. Early defoliation of apples includes brown spot, round spot, gray spot, wheel spot and spotted bend disease, which have a great impact on the yield and quality of apples, and also have a great impact on the tree potential and yield in the second year. The main methods of prevention are:

1. Sweep up fallen leaves. After the leaves of the apples have fallen, they should be cleaned, burned or manged in time. Shallow tillage can also reduce the source of overwintering bacteria.

2. Reasonable pruning, pay attention to improving the ventilation and light transmission conditions of the orchard and tree crown.

3. Do a good job of drainage after rain in the orchard, reduce humidity, improve the permeability of the root system, and if the ground humidity is too large, you can also use plant ash to sprinkle the ground, which plays a role in moisture absorption and can reduce the occurrence of diseases. Qualified orchards should be planted and covered as much as possible, and the drainage of the orchard should be done well, so that the rain stops drying and the humidity is reduced.

4. Strengthen fertilizer and water management, strengthen the tree, and improve the disease resistance of the tree.

5. Pharmaceutical prevention and control: the key to the prevention and control of apple brown spot disease is to spray 7 l0d before the onset of the disease in previous years to prevent the initial infection of overwintering bacteria. The second is continuous spraying in the rainy season to control the epidemic of diseases.

The third is to improve the spraying technology and ensure the quality of spraying. Fourth, the effective agent is selected to ensure the spraying effect. There are many types of effective agents for the prevention and treatment of early defoliation, and 80% mancozeb (Dasheng M-45, Taisheng, Bideli Mz-L20) wettable powder 800 times, L0 Shigao water dispersible granules 2 500 3 000 times, 25 true high microemulsion l0 000 times, easy water dispersible granules l 000 l 500 times, 70 methyl tobuzine l 200 l 500 times, 50 carbendazim 800 l 000 times and other agents.