What are the hazards of peach tree anthracice to peach trees, and how to prevent and control it?

Anthrax is a major enemy that harms the fruits of medium and late maturing varieties, such as poor or untimely control, and it is one of the diseases that cause the greatest losses in rainy years. The damage of anthracnose is relatively light in the young fruit stage of peach, and the spores of anthracnose will quickly germinate and infect the fruit reproduction under the environmental conditions of high temperature and high humidity in June. Whether it is bacterial or fungal disease, there is an incubation period after infection, the shortest is 3 to 5 days, and the longest can be up to 25 days before the onset of disease (scab disease).

Therefore, prevention must be the first, supplemented by treatment, so that prevention and treatment can be combined, in order to eliminate the disease in the embryonic stage, in order to ensure that the peach fruit is not lost.

Jujube nectarine anthracnose fruit.

Peach farmers pay the most attention to the early stage of young fruit pest control, often ignore the prevention and control of diseases in the middle and late stages, resulting in the phenomenon of tight, loose, and no matter what happens, the result is needless to say, the occurrence of peach anthracnose is the most serious when it rains, and the loss of late ripening peaches is also the largest. Therefore, the mid-late ripening varieties of peaches should focus on the prevention and control of anthrax in June. It is best to prevent before the rain and treat after the rain, and the selection of drugs should be widely used fungicides, and various fungicides should be used alternately to prevent the disease from producing drug resistance and reducing the control effect.

After rotting the fruit, it hangs on the branch and does not fall.

Broad-spectrum fungicides can be selected before rain. Such as carbendazim, Luo'an No. 3 (Methyl Trol), etc. It not only protects against fungi, but also prevents a variety of bacterial diseases.

After the rain, you can choose Qianlu, Wanxiu, Anguoli, and pyrazole. The time of pyridine medication is very important, it has the ability to promote the absorption of nitrogen fertilizer to make the new shoots of peach trees grow, but it is not conducive to the improvement of fruit coloring and sugar content, and it is forbidden to use it 30 days before maturity. If it is found that there are infection points on the fruit, one can be changed to two to increase the efficacy of the drug, and it is best to add silk moistening to increase the control effect will be more thorough.

Peach trees are sensitive to copper preparations, and it is forbidden to choose copper pesticides to prevent and control diseases during the growing season, so as to avoid unnecessary losses caused by pesticide damage.

Anthracnose fruit of hairy peach.

Each peach tree growth stage has the main object of controlling pests and diseases, with the main pest and disease of peach tree as the leader and other pests and diseases. In June, when there is a lot of rain, it is necessary to grasp the anthrax as the prevention and control leader, and consider other pest control series work. Most diseases are fungal.

In the area around Yuncheng, as long as you prevent and control anthrax, other fungal diseases can be said to be cured. However, if you find that there is a bacterial perforation disease, it not only harms the leaves, new shoots, but also the fruit, in this case, you have to choose the medicine that specializes in bacterial perforation, plus other fungal control or general fungicides to treat other diseases.

In the late part of last year, there was a lot of rain, and some peach farmers relaxed disease control, resulting in a large number of rotten fruits in the late-maturing varieties of anthracnose, and huge losses. According to the recent weather forecast, the rainfall may increase, which should be highly valued by the peach industry alliance! It is particularly important to strengthen the prevention and control of anthracnose before and after rain in jujube nectarines (including other varieties)!

It is easy to cause the phenomenon of falling flowers and fruits and leaves, which will eventually lead to the reduction of peach yield. Plant insecticides should be used, evenly sprayed on plant leaves, and should not be watered during the medication, otherwise there is no effect, you can spray several times.

Disease-resistant varieties can be planted on disease-resistant branches that fall off the diseased fruit quickly, or the whole fruit rots and loses water. It can also strengthen drainage, increase the application of phosphorus and potassium fertilizers, enhance tree strength, and avoid excessive density and long branches for control.

The young fruit quickly dries out after being infected, turning into a stiff fruit that hangs on the branches. When the disease occurs, the larger fruit sinks and turns brown, and when wet, it produces pink mucus, and the diseased fruit falls off quickly, or the whole fruit rots and loses its moisture, turning into a hard fruit that hangs on the branches. The onset of branching occurs mainly on fruit branches in early spring.

The diseased spot is brown rectangular, slightly depressed, and has a running glue. When the weather is wet, the diseased spots are also densely covered with pink spores. When the diseased point surrounds the branch for 1 week, the upper part of the branch, i.e., the wilted, diseased branch and the dead part, the leaves shrink and droop and roll forward into a tube.

Pathogenesis: fungal disease. Mycelium overwinters on diseased dead branches and diseased fruits, and in the early spring of the following year, they produce spores, infect the spores, and then spread to flowers and fruits, exacerbating the damage.

Continuous rainfall, hot and humid weather, easy to get sick when it is hot, and usually erupts after continuous rain or heavy rain. It is easy to get sick when the garden temperature is low, the drainage is poor, the pruning is rough, the branches are dense, the tree vitality is weak, and the nitrogen fertilizer is partially applied. The disease occurs three times a year in Shanghai, and is found on fruit branches from mid-March to early April.

It occurs on young fruits in early and mid-May, as well as ripening in June and July. Of the year, the damage is greatest during the young fruiting period. The incidence of the disease varies greatly between breeds.

In general, early-maturing varieties are the most affected, followed by medium-maturing varieties, while late-maturing varieties are more resistant to disease.

3. Prevention and control methods:

During winter pruning, dead branches, stiff fruits, and stumps should be carefully removed from the tree to eliminate the root cause of overwintering diseases. Perennial senescent and weak branches, which are prone to accumulation and latent pathogens, should also be cut off. At the same time, the main side branches that are too tall and too large should be retracted to facilitate the renewal and revival of the crown and branch groups, as well as the cleaning and spraying of the garden.

Cut off diseased branches before and after budding to prevent reinfection; Fruit branches with symptoms of leaf curling should also be cut off and buried deeply.

Choose disease-resistant varieties.

Strengthen drainage, increase the amount of phosphorus and potassium fertilizers, enhance tree vitality, and avoid excessive dense and long branches.

Spray 1-2 times 1:1:100 Bordeaux mixture at the budding stage (disabled after leaf development).

The young fruiting stage begins after flowering, with a zinc-copper-lime solution (350 g of zinc sulfate, 150 g of copper sulfate, 1 kg of quicklime, 100 kg of water), once every 7-10 days, and controlled 3-4 times in a row. These are the harmful symptoms and prevention methods of peach anthracnose that have been written.

The cause of anthracnose in peach trees is due to the accelerated epidemic of Longospora discs under the condition of continuous rainfall during the period. Strengthen cultivation management, reasonable fertilization, timely removal of water accumulation in orchards, timely removal of erect long branches in summer, improve ventilation and light transmission conditions, and remove pathogens.

The low temperature and rainfall of peach trees in the flowering and young fruit stages are high, and the incidence is high. During the fruit-ripening period, the disease is severe in a warm, cloudy, foggy and humid environment. Remove dead branches, dead fruits and fallen branches and leaves on the ground from the tree in a timely manner, and deal with them in a centralized manner.

Prevent water accumulation after rain to reduce humidity in the park. Appropriate application of phosphorus and potassium fertilizers can promote the growth of peach trees and improve disease resistance.

The causative agent that causes peach anthracnose is Longospora disc. When the average temperature reaches 10 12 and the relative humidity of the air reaches more than 80 in the early spring of the following year, the disease spots begin to produce conidia, and the spores spread by wind and rain and fall to the young fruits, new shoots and leaves, forming a primary infection. The peak period of onset is from mid-May to mid-June.

The occurrence of anthracnose in peach trees is also closely related to rainfall, and the continuous rainfall during the onset period makes the disease aggravated by the repeated infection of the pathogen. Canopy closure and partial application of nitrogen fertilizer are conducive to the disease.

Pesticide control, in the flower bud expansion stage, spray 1:1:160 Bordeaux liquid, or 5 Baumé stone sulfur mixture, after leaf development can not use Bordeaux liquid.

After flowering, spray fungicide in time, you can use 70 methyl tobuzin wettable powder 1 000 times, or 50 carbendazim wettable powder 800 times, or 40 carbon trane wettable powder 600 times, or 75 chlorothalonil wettable powder 1 000 times.

Answer: Hello, the main damage of peach tree anthracnose is the fruit and branches, especially the most serious damage to young fruits. In areas where peach and plum trees are mixed, they are sometimes susceptible to each other, and the damage is severe. At the beginning of the disease, the surface of the young fruit is brown and water-stained, and as the fruit expands, the lesions also expand, which are reddish-brown, round or oval, and obviously concave.

Mature fruits are mainly diseased at the top of the fruit, with sunken lesions, obvious concentric rings, and small vermilion spots (conidia discs) at the lesions when wet. The tender shoots begin to appear water-stained spots, and gradually appear brown oval-shaped, sometimes irregular lesions, with obvious junctions between lesions and normal places, and as the lesions become larger, the young leaves turn black and shrink and wilt and wither. Hope it helps, thank you,

Peach anthracnose is also called Mushou disease. It is one of the main diseases of peach trees in China, distributed in various peach producing areas across the country. In severe cases, a large number of fruits rot and a large number of branches die, causing serious losses.

1) Symptoms, in the early stage of the disease, the young fruit presents small black spots, and then the diseased fruit becomes corked, the surface is cracked, and in severe cases, the diseased fruit turns brown and rots, and finally becomes a stiff fruit. Fruit symptoms mostly occur in the late stages of growth, especially in the period before harvesting. The diseased fruit is a light brown water-stained spot at the beginning, and as the fruit expands, the lesion also expands to reddish-brown, and gradually turns into a dark brown depression.

Under humid conditions, the diseased part produces small red spots, that is, the conidia disc is in the shape of concentric rings, and most of the diseased fruit or completely rots to the ground. Peach blossom susceptibility is manifested as withering, browning, and later drying out, and attaching to the peach branch in a mummified manner. The tips of the branches of the flowers are infestation, and the tips are dead.

The branch tips are damaged, and dark brown slightly concave water-stained oval lesions appear, on which small orange-red spots grow, and the diseased tips are mostly bent to one side, and they die in severe cases.

2) The occurrence is regular, and the hyphae of the pathogen overwinter in the tissues of the dead diseased branches. These diseased branches often have dead fruits of diseased young fruits. The overwintering diseased branches gradually die and form conidia during flowering.

The spores spread to the young fruits and young leaves with wind and rain, and the insects began to infect. After the pathogen invades the host, it first spreads between cells, and then forms a conidia disc and a conidia under the epidermis, and breaks through the epidermis after maturity, and the conidia exposed by the spore disc spreads with wind and rain, causing re-infection hazards. The fungus spreads in large numbers before budding and flowering, causing a large number of fruiting branches to die.

Later, during the young fruit period, the young fruit and young leaves are infected, causing many young fruits to rot and fall off in large quantities. From the perspective of the environment of the disease, the damp plots are seriously diseased, the management is extensive, the branches are too dense, and the trees are weak.

3) Prevention and control methods: Prune diseased branches, from before the budding of peach trees to the onset of the disease, and before the leaves fall, the diseased branches showing the symptoms of leaf rolling can be cut off and burned in a concentrated manner to reduce the source of disease. Pesticide control, spraying 80% sodium pentachlorophenol 200 300 times plus 3 5 Baumé stone sulfur mixture before peach tree germination can eradicate pathogens.

In areas with severe disease, before the peach tree blooms, after flowering and at the young fruit stage, it can be sprayed once with 50% antibacterial special 800 1000 times solution, or 70% methyl tobuzine 1000 times solution. Strengthen the management of peach trees, pay attention to reducing humidity, increase phosphorus and potassium fertilizers, and improve the disease resistance of trees.

[Harmful symptoms].

The disease mainly affects fruits, but also new shoots and leaves. The young fruits of the victim are dark brown, shriveled and hardened, and their growth is stopped. The surface of the large fruit is water-soaked light brown spots, which gradually turn dark brown and shrink and concave.

When the climate is humid, small orange-red spots (i.e., conidia piles) grow on the surface of the lesions, and often heal into irregular large spots, causing the fruit to rot and fall off or shrink into stiff fruit on the branches.

Pathogenesis] The pathogen overwinters on the diseased fruit or diseased branch with mycelium, and when the average temperature reaches 10 12 and the relative humidity reaches more than 80%, a large number of conidia can be produced, which are spread by wind, rain, insects, etc., and begin to infect. The suitable temperature for the development of the pathogen is 25, and the onset of the disease is more severe in July and August.

Prevention and control methods] manual control. Combined with winter pruning, completely cut off diseased branches, dead shoots and stiff fruits, and burn them intensively. Pharmaceutical prevention and control.

When the buds are enlarged, spray 50 times the liquid of Busolibar, or 3 5 times the Baumé stone sulfur mixture, and when the young fruits are as large as beans, spray 500 times the solution of anthrax Fumei, a total of 3 4 times, each time with an interval of about half a month.