What are the black dots on grapes, what are the little black dots on grapes

Black spots on grapes are small spots left by the invasion of germs.

Black spots on grapes are caused by grape anthracnose. It mainly harms the fruit close to maturity, so it is also called "late rot" pathogen, which damages the stem and shaft of the fruit, and the top of the panicle near the ground is the first to disease.

After the fruit is damaged, small brown round spots the size of needles appear on the surface of the fruit, and then the lesions gradually expand and depression, and many small black spots arranged in a wheel-like arrangement appear on the surface, that is, the umbilicus of the pathogenic bacteria. In wet weather, the most noticeable feature is the appearance of pink colloidal conidia. In severe cases, the lesions can spread to the entire surface of the fruit.

In the later stages of infection, the fruit will rot and fall off, or it will gradually lose water and shrink into a frozen fruit. The stem and shaft of the fruit are diseased, producing black-brown rectangular dimples, and in severe cases, the entire spike will dry up or fall off.

Precautions against grape anthracnose:

1. Seedling disinfection:

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

2.Clearing the orchard:

The first infect of grape anthracnose comes mainly from the mycelium of overwintering organisms. Clean well in winter and kill diseases directly in swaddling clothes, so as to reduce the number of plants infected by diseases. When pruning in winter, cut off diseased branches and fruits, remove dead branches and leaves, and then concentrate on treatment.

Agents such as limestone-sulfur mixtures are sprayed on the land surrounding the fruit trees.

3.Disease-resistant varieties:

Different grape varieties have different resistance to grape anthracnose. For example, varieties such as Combare and Rose Dew are very resistant to black pox. Choosing disease-resistant varieties that are suitable for local growing conditions can reduce the occurrence of black pox and play a key role in improving the quality and yield of grapes, thereby increasing farmers' economic income and avoiding greater economic losses.

4.Fertilizer and water management:

Strengthening fertilizer and water management plays an important role in reducing the occurrence of grape anthracnose. Trenches should be made before and after the grapes are planted to effectively play the role of organic fertilizer, which is conducive to maintaining the vigorous growth of the trees. When topdressing, the use of compound fertilizers containing nitrogen, phosphorus and potassium helps to replenish the nutrients required by plants in time.

Small spots left by germs invading. The small black spots on the grapes are caused by grape anthracnose. It mainly harms near-ripe fruits, also known as "late rot" pathogens, which attack the fruit stalk and cob, and the tip of the ear near the ground is the first to occur. <

Black spots on grapes are small spots left by the invasion of germs.

The small black spots on the grapes are caused by grape anthracnose. It mainly harms the fruit that is close to maturity, so it is also called "late rot" pathogen, which invades the fruit stalk and cob, and the fruit at the tip of the ear near the ground is the first to disease.

After the fruit is damaged, small brown round spots with large needles are produced on the fruit surface, and then the lesions gradually expand and concave, and many small black spots arranged in the shape of whorles are produced on the surface, that is, the conidia disc of the pathogen. The most obvious feature is the conidia that emerge from pink gum when the weather is wet, and in severe cases, the lesions can spread to the entire fruit surface.

In the later stage, the fruit is soft and rotten and falls off, or gradually loses water and shrinks into stiff fruit. The fruit stalk and cob are diseased, producing dark brown oblong sunken lesions, and in severe cases, the whole panicle fruit will dry up or fall off.

It may be that the grapes are rotten, they may be too ripe or they have gone bad in the area that has been touched by insects, so it is best not to eat those spoiled grapes.

Summary. OK.

Black grapes belong to natural seedless grapes, in order to increase the size of the fruit, it is generally treated with gibberellin, and the granular pimples on the fruit surface are caused by the high concentration of gibberellin treatment, that is, "fruit thorns". Gibberellin treatment is at full flowering, before the grape harvest.

Forty or fifty days, so eating it will not be harmful to the human body.

What are the small black dots on the grapes, and can this grape be edible.

OK. Black grapes belong to natural seedless grapes, in order to increase the size of the fruit, a bright draft must be treated with gibberellin, and the granular pimples on the fruit surface are caused by the high concentration of gibberellin treatment, that is, "fruit thorns". The gibberellin treatment period is the peak flowering period, which is before the grape harvest period.

Fourth, five reputations disturb ten days, so eating will not be harmful to the human body.

I hope you can be satisfied, you can ask me a follow-up, I hope you will forgive me. Have a great day!

Black spots on the grape skin may indicate that the grape has black pox. Grape black pox disease can damage the green parts of grapes, such as leaves, fruits, shoots, tendrils, petioles, and cobs. Peel off the skin, and if the inside is normal, it is still edible.

When the grapes grow and start to soften, small black dots with a diameter of millimeters appear on the surface of the fruit, scattering like fly droppings. It does not harm the pulp, and the fruit does not rot. The diseased spores are scattered on the fruit surface, and the mycelium secretes decomposition enzymes to decompose the fruit powder after germination, and the mycelium covers the fruit surface, and when the fruit powder disappears, it will damage the appearance of the fruit grains.

Small black dots will also appear in the new hair to talk about Li disease.