What are the symptoms of peach tree rot disease?

Anyone who grows peaches may know that peach trees can get a disease called peach tree rot disease, which is symptomatic, and fruit tree rot disease mostly occurs on the main trunk, main branches, side branches, and sometimes the root of the main tree is also damaged. The lesions are mostly on the sunny side of the branches and branches. At the beginning of the disease, the diseased part is slightly raised, which is water-immersed, and sometimes the flow gum of a large grain of rice can be seen on the outside, which is sunken when pressed, and the outline is oblong-oval; The disease is yellowish-white at first, gradually turning brown, tan to black; The diseased tissue under the glue dot is yellow-brown moist and rotten, the diseased tissue is soft and rotten, and the decaying skin has the smell of distiller's grains.

In the later stage, the decaying tissue is dry and concave, and the surface produces gray-brown nail-like protrusions, such as tearing the epidermis, many eyeball-like black protrusions can be seen, and small black spots are produced on the surface, and orange-yellow filamentous spore horns can overflow on the small black spots under humid conditions. When the lesion spreads around the branch, it causes the branch to die or even the whole tree to die.

How to prevent this disease, first of all, agricultural prevention and control. The early lesions on the main branches and side branches should be scraped off the surface of the diseased skin of the trunk with a sharp scraper in time, and the surface layer of the living skin of 1 mm should be scraped off until the white-green healthy skin is exposed. For serious diseased branches or dead trunks, they should be sawed off in time, and the orchard should be burned down; Increase the application of organic fertilizer and top dressing in the appropriate period; Reasonable and scientific fruit thinning, adjusting the load, and enhancing the tree potential to improve the disease resistance of fruit trees; Paint the trunk white in time before winter to prevent frost damage; Pay attention to the prevention and control of dry pests and avoid causing various wounds.

It can also be prevented and treated with chemicals. After falling leaves or before germination, the whole garden was sprayed with 100 times of 40% Fumearsine wettable powder or 3 5 degrees of stone sulfur mixture to eradicate the fungus on the tree; After lightly scratching the diseased skin, apply a strong systemic agent, and spray fungicides with permeability and long residual effect, such as methyl tobuzine 1000 times, chlorothalonil 1500 times, and Guofukang 500 times, to kill the latent rot bacteria on the bark and prevent the recurrence of pathogen infection; The wound of the diseased tissue should be scraped with medicine and sterilization, and the agent can be 5 10 degrees of stone sulfur mixture, 45% crystal stone sulfur mixture 20 times of liquid, and Guofukang 10 15 times of liquid.

The above are the symptoms and prevention methods of peach rot disease that I know.

There will be very large flow gums, there will be purple spots, and there will be a strong odor, there will be yellow-brown decay, which will cause the plant to shrink and dent.

Peach tree rot disease is distributed in various peach producing areas in China, and is an important disease on the branches of peach trees. In addition to peach trees, the disease also harms apricots, plums, cherries and other stone fruit trees. (1) Symptoms.

Peach tree rot pathogens mainly damage tree trunks. Trees can develop from early spring to late autumn, with early spring being the fastest. After the branch is damaged, the lesion is slightly sunken, and the surface has a flow of gum the size of a grain of rice.

Later, with the increase of the flow glue point and the increase of the amount of flow gum, the tissue at the flow gum decay, slightly soft, reddish-brown, and smelled of sake lees. In the later stage, the lesion loses water and shrinks and sinks, and it is densely covered with gray-white dots of this slag, which is the subseat of the pathogenic seedling. When the weather is wet, reddish-brown filamentous spore piles can be expelled from the subbase.

Twig injuries often show sunken ulcer spots, and in severe cases, the branches die. (2) The pattern of pathogenesis. The fungus overwinters in diseased tissues with mycelium, ascomycetes and conidia, and dissolves the spores by rainwater the following year, spreading them through wind, rain and insects.

Spores can invade wounds, skin holes, and dead parts of branches. Frostbite wounds caused by winter are the main site of invasion of germs. The lesions expand more rapidly in spring and autumn.

High temperatures have an inhibitory effect on the disease, so the spread of the lesions is temporarily stopped in the summer. Peach rot pathogen is a weak parasitic fungus, which can cause the external conditions of tree weakness, such as excessive loading, uneven fertilization, orchard water accumulation, frost damage, etc., can cause the occurrence of the disease. (3) Prevention and control methods 1, agricultural prevention and control, strengthen orchard management, reasonable fertilization, and more organic fertilizer.

In the rainy season, the orchard should be prevented from accumulating water, and in winter, attention should be paid to frost prevention. Enhancing tree momentum is key to preventing the disease from occurring. 2. Artificial prevention and control, after the scar is found in spring, it should be completely scraped off, and the wound can be smeared with 5 Baumé stone sulfur mixture or 40% Fumearsine wettable powder 50 times liquid, and then coated with 1 layer of vegetable oil to protect the wound from gelatin.

Rot disease is more common in the main and long branches, and can also cause root rot in the early stages, and often cause the long branches or even the whole fruit tree to die in the middle and late stages. In the early stages of the disease, we are generally negligent and careless because it is not too obvious. The roots of the diseased tree will initially turn light brown with a slight downward dentation, and there will be pale yellow sap discharge, and eventually it will turn purple-brown and wither.

If we look at it, we will see that the lesions are tan and smell of sake lees. It is also caused by a parasite, which enters through the pruning or cutting of fruit trees, and some trees are susceptible to the disease when their resistance is weakened.

In addition, in areas with large temperature differences, after the temperature is too low at night to freeze the fruit trees, pathogenic bacteria will enter from the wound, and the occurrence and infection of this kind of disease are mostly in spring and autumn. Immediate prevention, often check the branches of the peach tree, if you find diseased spots, immediately wipe the green will make the sick skin quickly wither, let the sick skin fall off, and at the same time the green will be disinfected and sterilized. Fourth:

After pruning peach branches in winter, it is necessary to wipe the anti-corrosion film at the cutting and trimming mouth to maintain the growth and development of the wound mechanism, avoid bacterial infection, completely eliminate dead branches and leaves, and treat them in a centralized and unified manner to reduce the origin of pathogenic bacteria.

After the peach fruit is infected by bacteria, it first produces small annular lesions on the surface of the fruit, which are slightly indented, light brown in the outer field, and gray in the middle. After that, the lesion expands rapidly and the dent worsens. In a damp and cold environment, a grayish-white mold layer is formed on the lesions, which are the conidia and conidia of the pathogen.

In the middle and late stages, the lesions are dehydrated, and the fruit is soft, milky white, like dead wood. The new shoots are killed, resulting in dark brown spots and ulceration. The leaves are infested, and the lesions are nearly oval, black-brown.

Fruit tree trunk rot, also known as gum disease, most of the fruit tree trunk rot occurs on the main stem of fruit trees with relatively large crown diameter and some thicker branches. At the initial stage of the disease, the lesions are convex with the vent as the core, brownish-black, and the surface is moist. A yellowish viscous adhesive underneath the epidermal layer.

It is generally confined to the epidermis, but senescent branches can penetrate deep into the phloem.

In the middle and late stages of the disease, a large number of fusiform or near-circular black spots emerge on the surface of the lesions, which are discharged from the cracks in the roots, resulting in the decline of the fruit tree, and in severe cases, it will also cause all branches or the whole tree to wither. Most of the fruit tree trunk rot occurs on the main stem and branches of fruit trees with relatively large crown diameter. At the initial stage of the disease, the lesions are convex with the vent as the core, brownish-black, and the surface is moist.

A yellowish viscous adhesive under the epidermal layer of the lesion. Lesions are long or irregularly shaped, usually confined to the epidermis, but senescent branches can penetrate deep into the phloem. After that, the lesion slowly becomes indented, dark brown, and a relatively large gap occurs.

In the middle and late stages of the disease, a large number of fusiform or near-circular black spots (sub-seats) emerge on the surface of the lesions, and sometimes multiple black spots gather together and emerge from the cracks of tree roots, and the size is generally 1 8 mm. The large trees that have been damaged for many years have caused the plant to be extremely weak, and in severe cases, all branches or the whole tree have withered.

We should find out in time, cut down diseased branches, fertilize peach trees in a targeted manner, apply white powder to kill diseases and insects at the place where we cut down diseased branches, often detect pests, and spray pesticides; The main cause of the disease is pests.

Enhancing tree momentum is key to preventing the disease from occurring. Root cause: Peach tree rot disease, also known as dry blight, is a disease that occurs on peach trees caused by the infection of drupe black rot crustacea.

It is mainly to solve the problem of bacterial infection, most of which are caused by drupe black rot shell fungus.

<> after falling leaves or before germination, the whole garden needs to be sprayed with 100 times of 40% formarsine wettable powder or 3-5 degrees of stone sulfur mixture; Eradicate tree pathogens, spray fungicides with permeability and long residual effect after lightly scratching the diseased skin, and use methyl tobuzine 1000 times solution, chlorothalonil 1500 times liquid and other strong adsorptive agents; The wound of the diseased tissue should be coated with antiseptic measures, and the agent can be 5-10 degrees of stone sulfur mixture.

First of all, the leaves will be very yellow, and they will wilt, and there will be a lot of symptoms, and there will be a lot of spots on the peaches, and the taste will also change.

The leaves of the peach tree will have some yellow-brown spots, and there will also be some brown spots, and if it is not treated in time, the peach tree will also rot, and the surface of the peach will also have some yellow-brown spots, and finally until it rots and falls. It will also cause the leaves of the peach tree to fall.

The symptoms of the disease are that the branches of the peach tree will lose their bark, the leaves of the peach tree will also rot, and the leaves will be accompanied by brown spots, and this disease will also affect the production of fruits.

The symptom of the disease is that the fruit surface produces brown round lesions, the flesh of the lesions rots, and finally loses water and shrinks to brown and falls.

Gummosis. Symptoms of gum disease: Gum disease occurs mainly in peach branches, especially the trunk and main branches of trees, which are most likely to occur.

The initial disease swelled slightly, gradually overflowing translucent gelatin, and the condition worsened after the rain. After that, the colloid gradually turns jelly, and it is yellowish-brown after losing water; It turns dark brown when dried.

Control methods: 1) Strengthen the management of water, soil and fertilizer, improve the physical and chemical properties of soil, improve soil fertility, and improve the stress resistance of forest trees.

2) Control all kinds of pests and diseases in Taoyuan in a timely manner.

3) After scraping, the knife edge and damage are coated with 843 rehabilitation agent and other protective agents and waterproof coatings.

4) After the leaves are dropped, the trunk and branches are whitened to prevent sun exposure and frost damage, and kill insects. The whitening agent is soybean juice: salt:

Quicklime:water = 1:5:

25:70。First, boil the high-quality quicklime water, add the bean juice and salt, and mix into a paste.

5) Spray stone sulfur mixture at the early stage of bud expansion to eliminate overwintering bacteria.

1. Peach bacterial perforation disease.

It is found in all peach producing areas across the country, and poorly drained orchards or rainy years are more harmful. The disease is caused by bacteria and mainly affects leaves, fruits and shoots. At the beginning of the disease, the leaves are water-stained yellowish-white to white small spots, and then form round, polygonal or irregular, purple-brown to black-brown, with a diameter of about 2-4 mm.

2. Peach scab.

Also known as scab disease: it mainly harms fruits, but also affects new shoots and leaves. The disease is mostly found in the shoulder.

The lesions on the fruit are green and watery at first, and then turn black-green and nearly round after enlargement. When the fruit is ripe, the lesions turn purple or dark brown, the lesions are confined to the peel and do not penetrate deep into the pulp, and the later lesions become corked and cracked. The time for the pathogen to invade the fruit is 6 weeks after flowering, about mid-May to one month before ripening.

3. Peach brown rot.

In the early stage of the disease, small black spots are seen, and later the diseased spots are corked, the surface is cracked, and in severe cases, the diseased fruit turns brown, rots, and finally becomes a stiff fruit. In the later stage of fruit growth, there are more diseases, and in the early stage of infection, brown and round small lesions are seen, and then, the lesions expand quickly, and expose gray powdery balls, which resemble a spit, arranged in concentric rings, and most of the diseased fruits or completely rot and fall to the ground. Peach blossom infection shows withering and browning.

4. Peach anthracnose.

The young fruit of the hard core is infected, and the brownish-green water-stained lesions occur on the fruit surface, and the lesions expand and depression later, and produce pink sticky spore clusters, and the lesions on the young fruits increase along the fruit surface and reach the fruit peduncle, and then penetrate deep into the fruit branches, so that the leaves on the new shoots roll upwards several times, which is one of the characteristics of this disease. Most of the fruit fell off in May. The disease occurred at the near-ripening stage of the fruit, and the symptoms of the fruit surface were the same as before, and there was obvious concentric annular shrinkage, and finally the fruit was soft rot and fell off.

5. Peach gum disease.

It is an important disease of the branch, causing the weakening of the tree, the reduction of yield or the death of the tree, and there are two kinds of non-infectious and fungal infective. In spring and summer, some protruding lesions of different sizes occur on the new shoots of the current year, centered on the skin pores, and then colorless and translucent soft gums flow out. Later, the gum becomes a brown crystal, expands after absorbing water, and is a peptone-like colloid, and when it is severe, the bark is cracked, the branches die, and the tree is weakened.

Peach tree rot disease is a more harmful branch disease, what do you know about it?

Peach fruit tastes sweet and sour, so what do you know about the rot disease of peach trees?

The first peach dry rot mainly occurs on the trunk and main branches of old peach trees, centered on the stomata, dark brown, and moist surface. There is yellow viscose under the cortex. The lesions are long or irregular, usually confined to the cortex, but can penetrate deep into the xylem of aging trees.

In the later stages of the disease. Sometimes there are several small black spots densely, and if the peach tree is severely infected with wood rot, the peach tree should be uprooted in time and destroyed from the orchard. Be sure to thoroughly clean the diseased branches of the peach tree, and no diseased branches can be left.

Second, peach rot is an important peach branch disease that occurs in cold regions, and it can cause premature senescence, dry branches, reduced branches, and even the death of the entire fruit tree. Once a peach tree is found to be infected with wood rot, the infected shoots must be cut off immediately, the rotten wood removed, and then disinfected with tar. After disinfection, the wound must be wrapped with some healing agent or something else to prevent the wound from being reinfected with the wood rot virus.

Thirdly, the disease usually infects smaller branches first. When the ulcer spreads around the branch, the branch dies and causes symptoms of branch wilting; Causes the gradual death of major branches and trees. On the main stem and trunk, a large glue stream is discharged, and the diseased tissue then decays, is yellowish-brown, and rapidly expands to the xylem.

On weak branches, the lesion develops longitudinally, and the leaves appear yellowing, wilting, and cracking.

Fourth, providing sufficient water for peach trees is an important factor affecting the growth of peach trees, so it is necessary to pay attention to water management when planting peach trees. There should be no too much water in the peach orchard, neither too much nor too little. We have to maintain the most suitable water content.

When the rain is heavy, we have to dig more ditches to drain the rainwater accumulated in the peach orchard and prevent the peach orchard from accumulating. When it is hot in summer, pay attention to watering more. Evaporates faster on hot days.

We must pay attention to replenishing the moisture of the peach tree in a timely manner.