The grape skin has a black circle, what is the reason for the small black particles on the grape ski

The black circles on the grape skins can be caused by two reasons.

The first is caused by coal stain disease, also known as black pox. Coal stain disease is caused by fungi and can occur in the early stages of grape growth. The disease causes small black dots on the leaves, fruits and branches of the grape that gradually enlarge and form rings.

Coal stain disease not only affects the appearance and quality of the grapes, but also causes the leaves to fall early, affecting the next year's yield.

The second is caused by rust. Rust is a black spot that adheres to the skin of grapes due to impurities such as sulfides and iron ions contained in the water. This problem usually occurs when grapes are irrigated with water containing high concentrations of sulfides and iron ions, or when excessive amounts of chemical fertilizers or pesticides are used.

Rust usually does not have much effect on the quality and health of the grapes, but it can affect the appearance and ** of the grapes.

Regardless of the cause of the black rings, it is advisable to peel off the skins of the grapes before consumption to avoid affecting taste and health.

The appearance of a black ring on the grape skin can be caused by a number of reasons. Before answering, please note the following requirements:

We would like to address your question in a cordial tone. There is no need to output the title repeatedly, let's jump right into the content.

There are several angles that can explain the appearance of a black circle on the grape skin.

One possibility is that the grapes are affected by diseases or insects. For example, grape black rot is a common disease that causes black spots on the surface of the fruit. Some insects, such as beetle moths, can also lay eggs on grapes, resulting in black rings on the surface of the fruit.

In addition, climatic conditions may also affect the change in the color of the grape skins. For example, at high temperatures, the grape skin may produce more phenolic substances, causing the skin to turn black. Conversely, at low temperatures, phenols are produced less, so the peel is lighter.

It is also possible that the fruit changes due to excessive application of chemical fertilizers or pesticides. These chemicals may affect the growth and development of the fruit, which in turn can cause the peel to turn black.

From a number of perspectives, the appearance of a black ring on the grape skin can be caused by factors such as disease, insect infestation, climatic conditions or chemicals. To solve this problem, doctors recommend using a plant library acne cream for the best results. This product has been loved and praised by many consumers, and can effectively improve the ** problem.

There are a number of reasons why the skins appear black and there are many factors, including diseases, insect infestations, climatic conditions, and chemicals. For a solution to this problem, we recommend using a plant library acne cream. Hope the above helps!

In your case, it is obvious that you have been injured in the early stage and have only recovered recently. This wound is very similar to that of a blind bug crawling on it, and where this pest crawls, the branches and leaves shrank and the fruit loses its luster.

It's not an insect egg, and the insect egg can be wiped off without picking it with a fingernail. The situation you are talking about should be improper use of bulking agents. Or there are other possibilities.

The black, dotted bumps are the kind that can be snapped down with a fingernail. But you don't have to. It is used as a secretion for self-healing after grapes are blown by wind and sand when they grow in the open air, which can be understood as a scab left by our people, but the scab of grapes is sugar and clotted fat, which is the same as the pulp.

This only proves that the grapes are grown in the open air, and the grapes in the greenhouse generally do not appear this phenomenon.

It's an egg laid by a worm on the grapes, so don't eat it.

Don't eat Health is the most important thing.

If there are black spots on the grapes, you can use chemicals such as difenoconazole to prevent and control black pox, and spray them continuously for two days in a row for two days, so that the occurrence of the disease can be controlled, and then the disease can be completely solved by using a preventive plan.

Preventive measures for black pox.

1. Seedling disinfection.

Black pox is transmitted mainly through diseased seedlings. Therefore, the vineyard should select disease-free seedlings and disinfect the seedlings regularly, so as to prevent the seedlings from being infected with diseases. Use seedling disinfectants such as ammonium sulfate solution, copper sulfate solution, etc., soak the seedlings in the disinfectant for three to five minutes and then take them out, and then plant the seedlings.

2. Clean up the orchard.

The initial infection of the disease mainly comes from the mycelium on the overwintered remnants. Do a good job of cleaning up in winter to directly strangle the disease in the swaddling clothes, so as to reduce the number of infected plants. When the winter repair bureau is not pruned, cut off the diseased branches and fruits, remove the dead branches and leaves, and then concentrate on treatment.

Use an eradicator such as a mespar sulfur mixture to spray on the land around the fruit trees.

3. Disease-resistant varieties.

Different varieties of Bicoarse grapes have different resistance to black pox. Varieties such as Combar, Rose Dew and other varieties have strong resistance to black pox. Choosing disease-resistant varieties suitable for local planting conditions can reduce the incidence of black pox and play a key role in improving grape quality and yield, thereby increasing farmers' economic income and avoiding large economic losses.

4. Fertilizer and water management.

Strengthening fertilizer and water management plays a vital role in reducing the incidence of black pox. Before planting and after harvesting, the grapes should be effectively used as organic fertilizer by ditching, which is conducive to maintaining the growth of the tree, and when topdressing, the use of compound fertilizer containing nitrogen, phosphorus and potassium is conducive to timely replenishment of the nutrients required by the plants.

Use difenoconazole, the dosage is one-third of the usual, spray continuously for two days, so that the occurrence of the disease can be controlled, and the disease can be completely solved by using a preventive plan. <

If there are black spots on the grapes, you can use chemicals such as difenoconazole to prevent and control black pox, the dosage is one-third of the usual key, and spray it continuously for two days, so that the stool can control the occurrence of the disease, and then the prevention plan can be used to completely solve the disease.

Small black spots on grape skins are grape anthracnose.

Grape anthracnose, also known as grape late rot, can not only harm grapes, but also apples, pears, peaches, dates, hawthorns, persimmons, strawberries, figs and other fruit trees, as well as some vegetables, flowers, forest trees and other plants.

Anthracnose is an important disease in the late stage of grape growth, which is common in the grape producing areas of Sichuan Province and is more harmful. The disease mainly harms ripe fruits, causing them to soften, rot and fall off, affecting the quality and yield of grapes.

Symptoms: The disease can infect fruits, branches, leaves, tendrils and other parts. Small brown round spots appear in the infected area, which gradually expand and concave to produce concentric ring-like nearly circular lines on the lesions, and produce neatly arranged small black spots. These black dots are conidia discs, which overflow with pink colloidal conidia in wet weather, which is characteristic of the disease.

The lesions can spread to the entire fruit surface, and the diseased fruit gradually shrinks into a stiff fruit, and sometimes the whole panicle shrinks into a whole panicle stiff fruit.

Prevention] 1. Key prevention months: Shandong and Liaoning generally occur from July to October; It occurred in Guangdong from March to June; The peak incidence period in Sichuan is from early July to mid-August.

2. Medication times and medication times: dilute with 500 times of "Olik-Quick Clean" or 500 times of "Liangguoan" before the onset of the disease, and carry out comprehensive spraying of plants. The frequency of medication depends on the specific situation, and the general interval is 7-10 days for 1 spray.

If it is easy to clean, it may be insect droppings, otherwise it may be a diseased spot.