What is the disease of peach tree leaves turning red and curling leaves from late August to early Se

Hello, according to what you said, it may be peach leaf shrinkage disease. The pathogen of the disease overwinters or summers with spores on the bark and bud scales, and invades the leaves in the spring of the following year, causing the leaves to show the symptoms of shrinkage and curling. The susceptible leaves shrank and curled, the color changed to reddish-brown, the texture became brittle, and finally dried up and fell off; The internodes of the susceptible shoots become shorter, some are swollen, and the leaves on the diseased branches are mostly clustered, and the diseased shoots wither and die in severe cases.

Control method: Peach tree flower buds have just shown red but not yet, spray 5 Baumé stone sulfur mixture or 30% mineral oil and stone sulfur 200 times. If the current budding period continues to encounter cold and rainy weather, it is conducive to bacterial infection, and 70 heli thiophanate-methyl can be sprayed again 1-2 times.

Timely spraying in early spring is the key measure for the prevention and treatment of this disease, if it is continuously prevented and treated for 2-3 years, the disease can be **. In the early stage of the disease, the diseased leaves should be removed as soon as possible, the diseased shoots and fruits should be cut off, and burned in a concentrated manner.

You may be talking about leaf shrinkage, in the young leaves just pulled out will be harmed, generally the leaves curl, and then red, and so on after the leaves will shrink more severely, the leaf surface looks pitted, the affected part of the leaves are also thick, more brittle, at the beginning of the gray-green, and finally will slowly turn reddish-brown. When the air is humid, there is also a white powder at the affected area. Eventually, the leaves turn dark brown and then dry up and fall off.

The young leaves of the new shoots with severe disease will turn black and die when they are not yet there, and after death, they will arch and germinate axillary buds, and the newly extracted leaves will not be damaged again, but most of them will become clustered.

The trunk is painted white. Needless to say, the effect of whitening fruit trees is well known, after whitening, it can not only refract a part of the heat, keep the tree temperature stable, reduce sunburn, frost damage, etc., but also delay the budding time of peach trees for about 1 week, so as to avoid the low temperature period and reduce the incidence of disease.

Strengthen management. For orchards with severe disease, a large amount of defoliation in the early stage is easy to cause the tree to weaken, so it is necessary to increase fertilizer to strengthen the tree. Whether it is germination fertilizer, or pre-flowering fertilizer, to apply enough in advance, to maintain the nutrients of fruit trees, promote growth, enhance tree potential, fertilizer to Bikaphosphine potassium granules water-soluble fertilizer, as little or no nitrogen fertilizer, adult fruiting trees per mu to apply 40-50kg, young trees can not be applied.

Construct drainage ditches in advance and drain stagnant water in time to quickly reduce the humidity of the orchard; At the same time, do a good job of pruning and shaping to keep ventilation and light transmitted, which is conducive to reducing the humidity of the orchard and ensuring the normal growth of fruit trees.

First consider whether there is a lack of nutrients:

One. Nitrogen deficiency. Nitrogen deficiency in peach trees is characterized by light green to yellow leaves throughout the tree.

The lower part of the new shoot is the first to become diseased, the leaves turn yellow, and the petioles, leaf margins and veins turn red; In the later stage, the interveined mesophyll produces reddish-brown spots, and there are many spots, and the mesophyll is purple-brown necrosis when the disease is severe. The shoots stop growing, are thin and short, and the skin is light red or light brown. The leaves fall off from the bottom up.

When nitrogen is deficient, urea is mainly used for foliar spraying, and 30-50 times of the solution is used in autumn.

Two. Phosphate deficiency. Phosphorus deficiency in peach trees begins with the disease in the middle and lower leaves of new shoots, gradually spreads throughout the branches, and then manifests itself throughout the tree.

The initial leaves are dark green, the petioles turn red, and the dorsal veins turn purple; In the later stage, the front of the leaf is copper-colored. The old leaves at the base sometimes appear yellow and green spots, and even the whole leaves turn yellow, often falling off early. The apical young leaves sometimes grow erect, narrow and rolled downward.

The new shoots have few subdivided branches and are purple-red in color. The fruit is light in flavor and early in ripening. After phosphorus deficiency, spray 300-400 times of bika potassium dihydrogen phosphate, or 50-100 times of superphosphate clarification solution; When applying basal fertilizer in autumn, more organic fertilizer and phosphorus-containing fertilizer should be applied.

Three. Manganese deficiency. Manganese deficiency in peach trees first occurs from the upper leaves of new shoots, and gradually becomes heavier from top to bottom.

At the beginning, the leaf margin became light green and gradually extended to the intervein loss of green, while the main and midrib veins and their adjacent tissues remained green. In the later stage, only the midrib remains green, while most of the leaves are yellowed. Generally, the leaves do not wilt, and the new shoots and apical buds still grow, but when the manganese deficiency is extremely heavy, the new shoots grow short, the leaves are small and brown necrotic spots, and the spots are small.

Spray manganese sulfate solution in time.

Four. Zinc deficiency. Zinc deficiency in peach trees mostly starts from the old leaves, and then gradually develops to the new leaves, so that the new shoots are generally occurring, and the symptoms can generally be manifested in the early stage of growth.

When zinc deficiency occurs, peach trees show stunted growth, leaf loss of green, and severe disease of the sunny leaves of the tree. At the initial stage, except for the veins and their vicinity, the mesophyll between the veins obviously lost green and turned yellow. The apical leaves are small, petioles-free, and cluster-like. In the later stage, the diseased leaves are narrow and hard, sometimes shrunk and rolled outwards and produce purple-red spots, and the old leaves are easy to fall early and develop from the bottom to the top, eventually causing the new shoots to be bald or even die.

When applying basal fertilizer in autumn, the plant is applied with kilograms of zinc sulfate.

Five. Boron deficiency. At the beginning of the disease, the apical bud stops growing, the young leaves are yellow-green, and the leaf tip, leaf margin or leaf base appear scorched, and gradually develop to the inside of the leaf.

In the later stage, the diseased leaves are raised, twisted and even necrotic and fall early; The top of the new shoot withered, and from the bottom of the dead part grew many lateral branches, in the form of clumps; The newborn leaflets are thick, brittle, and deformed, with reddish veins and clumped leaves. Combined with autumn basal fertilizer, increase organic fertilizer, apply 150-200 grams of borax in severe cases, or spray borax before and after flowering.

Pests and diseases that cause yellowing and curly leaves of peach trees may be leaf shrinkage, peach aphids, etc.

1. Leaf shrinkage disease.

Peach tree leaf shrinkage disease mainly affects leaves, and in severe cases, it also affects flowers, young branches and young fruits. After the young leaves, the potatoes can be damaged, the leaves are curled, the color turns red, with the growth of the leaves, partially or completely thickened, and curled to the back of the leaves. When wet, a layer of gray-white mold is produced on the surface of the leaves, and then the diseased leaves turn brown, scorched and fall off.

The diseased shoots often grow in clusters and shrink, and in severe cases, the whole branches often die. The damage of young fruits is deformed, and the fruit surface often shows cracks and scars, and most of them fall off.

For the prevention of the disease, the focus is to do a good job in the early stage of the garden cleaning work and the prevention and control of the medicine after the leakage of the flowers, which can be used to win the pole (75% oxime fungus tebuconazole dry suspension), protection + ** + eradication, three effects in one.

2. Peach aphid.

The harmful symptom of peach aphid is that the damaged leaves of peach trees gradually thicken from the edge to the back and curl longitudinally, and the infested part becomes hypertrophied and resembles an insect gall. It not only affects the formation of flower buds, but also weakens the tree. The honeydew excreted by aphids pollutes the leaves and branches, retards the physiological function of peach trees, often causes bituminous coal disease, accelerates early defoliation, and affects growth.

To prevent peach aphid, you can use a yellow plate to trap and return to the stool, imidacloprid when the flower is red, etc., if leaf curling has occurred, you should choose a strong systemic drug such as flufeniliprole, and with a dialysis adjuvant.

Peach tree management methods

1. Effective pruning. Plastic pruning should be carried out according to the characteristics of the tree, and the management should be gradually changed to a tube, less cutting and more putting, and flexibly using a variety of plastic surgery and beauty adjustment methods to quickly form a balanced plant shape and produce a bumper harvest early. After winter pruning, the tree body is coated with a tree protector to maintain the safety of the tree body for winter.

2. Effective top dressing. After October, subsoiling is carried out and sufficient farm fertilizer is applied. The base fertilizer is generally used from September to October, and 100 to 150kg of farm fertilizer, 3kg of phosphate fertilizer, and 1kg of potassium sulfate are applied per mu.

Top dressing is generally applied at the flowering stage of the plant urea solution 1kg, potassium sulfate; 3kg of compound fertilizer was applied to the plants at the young fruit stage. And at the time of flowering, young fruit stage, and fruit expansion stage, it is sprayed once to increase the thickness of the fruit pedicle, improve the amount of nutrients transported, and prevent residual flowers, fruit dropping, rotten fruits, stiff fruits, and deformed fruits.

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Yellowing and curly leaves of peach trees can be caused by a variety of pests and diseases. Among the more common diseases include peach scab, peach anthracnose, peach leaf dwarf disease, etc. These diseases will cause the leaves of peach trees to appear yellowing, curling, atrophy and other symptoms.

In addition, peach trees are also susceptible to pests such as peach aphids, peach red aphids, and peach heartworms. They will suck the sap on the leaves of the peach tree, causing symptoms such as yellowing, curling, and drying up. In order to determine the specific types of pests and diseases, it is necessary to carefully observe the damaged peach trees, and judge the characteristics and incidence patterns of pests and diseases.

For different pests and diseases, corresponding control measures can be taken, such as spraying insecticides, disease agents, etc. At the same time, it is also necessary to pay attention to strengthening the management of peach trees, maintaining a good growth environment, and improving the ability of peach trees to resist diseases and macro insect pests. ✌️

Peach aphids are a common pest on peach trees, they will suck the sap of the peach tree, causing the leaves of the peach tree to turn yellow and curly, and in severe cases, it will also affect the growth and fruit yield of the peach tree. 2.Viral Diseases:

Peach trees may be infected with some viral diseases, such as peach blossom leaf virus, peach blossom dwarf virus, etc., these viruses can cause the leaves of peach trees to turn yellow and curly, and in severe cases, they can also affect the growth and fruit yield of peach trees. 3.Fungal diseases:

Peach trees may be infected with some fungal diseases, such as peach powdery mildew, peach scab, etc., which can cause the leaves of the peach tree to turn yellow and curly, and in severe cases, affect the growth of the peach tree and the yield of the fruit. 4.Lack of water and fertilizer:

If the peach tree is short of water and fertilizer for a long time, it will cause the leaves to turn yellow and curly, and in severe cases, it will also affect the growth of the peach tree and the yield of the fruit. In short, there may be many reasons for the yellowing and curly leaves of peach trees, which need to be judged and treated according to the specific situation. It is recommended that you take timely measures to prevent further damage from pests and diseases and protect the healthy growth of peach trees.

Hello dear. Life experts love to laugh and love, let you wait for a long time, I am happy to answer for you! The yellowing and curly leaves of the peach tree may be caused by the harm of the peach aphid.

The peach aphid is a common pest on the peach tree, which will suck the plant sap on the back of the leaves of the peach tree, causing the leaves of the peach tree to gradually turn yellow and curl, and honeydew will appear on the surface of the leaves, and even cause the death of the peach tree. In addition, yellowing and curly leaves of peach trees can also be caused by diseases such as peach scab and peach blight. It is recommended to carry out prevention and control in a timely manner, and use appropriate pesticides or biological control methods for treatment.