What is the matter with the blackened edges of the leaves of the persimmon tree?

The edges of the leaves of the persimmon tree are blackened:

It may be round spot disease, which is a disease that harms persimmon trees, and the main damage to leaf round spot disease occurs in all persimmon producing areas, which can cause the leaves to fall off early and make the fruit turn red in the early stage. Severely affects yields.

Symptoms: Round spot disease mainly affects the leaves of the lesion at the beginning of the light brown spot, the edge is not obvious, and then gradually become round, dark brown edge black-brown, the diameter of the lesion is about 2 to 3 mm, the yellow-green halo occurs around the lesion, the diseased leaf slowly turns red, and produces shedding. Persimmon horn spot disease and round spot disease can cause black spots, which occur more commonly on persimmon trees, and often cause leaf and fruit drop after the onset of the disease, and even the fruit is not harvested when it is serious, causing great economic losses.

1. Persimmon spot disease.

1. Symptoms: Harm persimmon trees and persimmon pedicles.

The leaves were damaged, and yellow-green lesions appeared on the front at the initial stage, with irregular shapes and blurred edges, and the veins in the spots turned black. As the lesion expands, the color gradually deepens and appears light black, and then the middle color fades to light brown. Because the expansion of the lesion is limited by the leaf vein, the shape becomes polygonal, and the black velvety small grain spots are densely grown on it, the back of the lesion is light yellow at the beginning, and the color gradually deepens later, and finally becomes brown or black-brown, there are also black edges, but not as obvious as the front, the black small grain spots are also scarcer than the front, the persimmon pedicle is infected, and the four corners of the pedicle begin to expand inward, the shape is uncertain, and both sides of the lesion produce black velvety small grain spots.

2. Pathogenesis law: horn spot fungus overwinters in the diseased pedicle and diseased leaves with mycelium, and the diseased pedicle hanging on the tree is the main initial infection and transmission center, generally from May to August, there are many rainy days, heavy rainfall, early rainfall is conducive to the production and invasion of conidia, the onset is early and severe, and the persimmon tree closer to Junqianzi is more serious.

3. Prevention and control methods:

2. Spraying protection: the critical period of spraying prevention is from late June to late July, that is, 20-30 days after flowering, and it is not good to be too early or too late. Elixir available 1:

3 to 5: 300-600 Bordeaux solution, 65% zeb wettable powder 500-600 times, spray 1-2 times, can effectively control the occurrence of diseases.

3. Avoid mixed planting of persimmon trees and Junqianzi: There are many stems of Junqianzi, in order to avoid its disease and infection of persimmon trees, we should try to avoid mixed planting of persimmon trees and Junqianzi.

4. Strengthen cultivation management: increase the application of organic fertilizer, improve the disease resistance of the tree, reduce the humidity of the orchard, and create conditions that are not conducive to the cultivation of pathogens, so as to achieve the purpose of disease control.

The blackening of the edges of the leaves of the persimmon tree can be caused by the following reasons:

1.Round spot disease, a disease that affects the leaves of persimmon trees, causes early leaf shedding and early reddening of fruits. Symptoms include small light brown spots on the leaves that gradually expand into dark brown round lesions with black-brown edges and yellow-green halos around them.

Small black spots may appear on the back of the lesion. The disease usually occurs during the rainy season from May to August, when the rainy season is early, heavy and early.

2.Horn spot disease, which mainly harms the leaves and pedicles of persimmon trees. After leaf damage, yellow-green lesions will appear on the front, pale yellow on the back, and then gradually turn brown or black-brown, and small black velvety spots may appear on the lesions.

The onset of this disease is similar to that of round spot disease, and it is also more severe during the rainy season from May to August, when the rainy season is early, the rainfall is heavy and the rainfall is early.

In order to prevent and control these diseases, the following measures can be taken:

1.Removing diseased stems hanging from trees is the main measure to reduce germs**.

2.Spray protection from late June to late July, and the critical period of spraying is 20-30 days after flowering. Available agents include 1:3 to 5:300-600 Bordeaux liquid, 65% zeb wettable powder 500-600 times, etc.

3.Avoid mixed planting of persimmon trees and Junqianzi, because there are many stems of Junqianzi, which are easy to infect persimmon trees with diseases.

4.Strengthen cultivation management, increase the application of organic fertilizers, improve the disease resistance of trees, reduce the humidity of orchards, and create conditions that are not conducive to the growth of pathogens.

What is the disease of the persimmon tree trunk turning black How to treat it.

Hello dear, the trunk of the persimmon tree turns black is persimmon madness, the solution is as follows: Symptoms: The diseased tree germinates late in spring, grows stunted, the leaf veins are black, the branches are quietly xylem turns black-brown with slag, and the phloem is seriously expanded to the phloem tissue, causing the branches to grow or erect or the branches are withered and the tips are scorched, and the fruit is less fruitful, and the fruit falls off after softening early, and the whole plant dies after serious failure.

Control methods :(1) Select disease-resistant varieties or use disease-resistant rootstock breeding. (2) Strengthen cultivation management and improve disease resistance.

3) Select healthy trees as rootstocks, and graft disease-free scion hidden chains. (4) Tetracycline antibiotics can be injected into the tree if necessary.

After dimethoate comes back, dilute 600 times the liquid Spray's Sleepy Release Once every 10 days Generally, 3 times can solve the problem What are the symptoms of persimmon madness when the trunk of the persimmon tree turns black: The diseased tree germinates late in spring, grows stunted, the leaf veins are black, the xylem of the branches turns black-brown, and the phloem is seriously expanded, causing the branches to grow or erect or the branches are withered and the shoots are scorched, and the fruit is less fruitful, and the fruit falls off after softening early, and the serious Lu manuscript does not bear fruit or the whole plant dies. Prevention and control methods:

1) Select disease-resistant varieties or use disease-resistant rootstock breeding. (2) Strengthen cultivation management and improve disease resistance. (3) Select healthy trees as anvils and early nucleus filial piety wood, and graft disease-free scion.

(4) Tetracycline antibiotics can be injected into the tree if necessary. Fertilization is very important, when the leaves of the persimmon tree have not grown in spring, dig a circle of small pits around the rhizosphere, combine watering and apply nitrogen, phosphorus and potassium compound fertilizer, and water thoroughly every 4-5 days to complete the soil covering. After the persimmon tree is set with fruit, it is necessary to apply a fertilizer based on phosphorus and potassium fertilizer in combination with watering to promote the persimmon to expand well.

Summary. The leaves of tomatoes are black and wilted, mainly due to diseases. In the summer, between May and June, tomatoes are exposed to high temperature and humidity, and tomato black spot disease, and the leaves will turn black, dry and wilt.

Between 3-7 in spring and 9-11 in autumn, in a humid environment, tomatoes develop tomato leaf mildew, and the leaves turn black, curl and wilt.

The leaves of tomatoes are black and wilted, mainly due to diseases. In the summer between May and June, tomatoes will get tomato black spot disease in a high temperature and humidity environment, and the leaves will turn black, dry and wilted. Between 3-7 in spring and 9-11 in autumn, in a humid environment, tomatoes develop tomato leaf mildew, and the leaves turn black, curl and wilt.

After the tomatoes have tomato black spot disease, the diseased branches, leaves and fruits of the tomatoes need to be cut off and burned in a concentrated manner. After pruning the diseased leaves, the tomatoes can be sprayed with iprodione, chlorothalonil or mancozeb. After diluting the agent with water, it is generally 7 to 8 days to spray tomatoes 1 time, and after spraying 3 or 4 times in a row, tomato black spot disease can be inhibited.

The blackening of the leaves of tomatoes may be caused by black spot infection. Black spot disease mostly occurs between May and June, and it is easy to get infected in a high temperature and humidity environment, which will cause the leaves to turn black, dry out, and even wilt, and the fruit will rot. If the disease is severe, it will affect the yield.

The diseased strains should be isolated as soon as possible, and sterilization and disinfection agents should be sprayed.

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What medicine is good to use?

There are many pesticides that can be used for black spot disease, generally using 4% flusilazole 800 1000 times solution, 75% chlorothalonil 500 times solution, 20% silazole prochloraz 800 1000 times solution, 80% zebsen 500 times solution, spray 1 time in 7 10 days, spray 3 4 times.

Summary. Hello! This is a physiological disease.

This is mainly caused by boron deficiency and calcium deficiency. The air humidity is high and low, and the soil is too dry and wet, which may affect the absorption of boron and calcium by the roots, resulting in boron deficiency, the above symptoms, and susceptible to bacterial diseases, boron and calcium fertilizer can be sprayed on the foliar surface, and 500 times of 20% leaf dry azole can be used to alleviate this symptom.

What to do if the edges of the leaves of a persimmon tree are blackened? What to do if the edges of the persimmon leaves are blackened.

Hello! This is a physiological sichakra disease. This is mainly caused by boron deficiency and calcium deficiency.

The air humidity is high and low, the soil is too dry and too wet, and the hole letter may affect the absorption of boron and calcium by the roots, resulting in a lack of boron, and the symptoms above the Nalu ship appear, and it is susceptible to bacterial diseases, so boron and calcium fertilizer can be sprayed on the foliar surface, and 500 times of 20% leaf dry azole can be used to alleviate this symptom.

The persimmon leaves are not hypertrophied on the side.

It should be a lack of nitrogen, phosphorus and potassium.

There is also a lack of boron and calcium.

What to do if the persimmon leaves have black leaves, and the persimmons fall again.

Hello, this is the scab disease of persimmon trees, prevention and control methods: (1) clean the persimmon orchard, remove a large number of fallen leaves in the persimmon orchard in late autumn and early winter, and bury or burn them in a concentrated manner to reduce the source of initial infection. (2) Strengthen cultivation management.

Increase the application of basal fertilizer, and timely irrigation of arid persimmon orchards. (3) Timely spraying prevention. Generally in early to mid-June, after the persimmon tree falls flower, a large number of ascospores are scattered before spraying 1:

5: 500 Bordeaux liquid or 70% mancozeb wettable powder 500 times liquid, 64% alum wettable powder 500 times liquid, 36% thiophanate-methyl suspension 400 times liquid, 65% zeb wettable powder 500 times, 50% carbendazim wettable powder 600 800 times liquid.