Black spot is the main disease of Chinese cabbage, what are the symptoms of Chinese cabbage black sp

The leaves and roots will be blackened, mainly because this situation will cause a certain amount of yield loss, so the most important thing to do in this case is to do it in time.

Chinese cabbage black spot disease, the shape of the lesion is round, and the color is gray-brown or brown, there are obvious concentric ring lines, sometimes there is a yellow halo around the lesion, and black mold is produced when the humidity is high.

First of all, there will be many round green spots on the leaves of Chinese cabbage, and then they will expand and become larger, and then they will become brown lesions, and there will be some wheel stripes on these lesions.

The question of black spots on cabbage that cannot be washed off has been debated for a long time. Some people say that it is because too much nitrogen fertilizer is applied, which affects the absorption of phosphate fertilizer; Some people say that it is caused by high temperatures and droughts; Others say that it is caused by a physiological disease...After consultation and data review, Chinese cabbage small black spot disease is a new physiological disease, which is caused by the rupture of the cell membrane caused by the programmed cell death of the cabbage cells themselves, and is not caused by foreign pathological harmful factors. It also has to do with the variety, climate, and fertilizer.

Cabbage sesame disease, also known as small black spot disease or cabbage sesame spot disease, is mainly caused by physiological abnormalities of nitrogen metabolism in leaves. When Chinese cabbage has sesame disease, a large number of black or black-brown sesame spots will appear on the petioles and leaf veins, and there are no mold or decay on the spots, and there are small black spots on the leaves and stems of the cabbage, which cannot be washed off. It is evident that these small black dots grow on the leaves and stems.

This kind of small black dots of cabbage is often a fertilizer damage caused by unreasonable fertilization. <>

But some people think it's about density, or too much fertilizer, but that's not true! If this is the case, it is impossible to have a neat distribution of black dots. If it is too dense and not ventilated, it will turn yellow and rotten, and if you apply too much fertilizer, there will be no black spots when you burn the leaves!

If you eat a lot of this kind of cabbage with a lot of big black spots, it can easily lead to hyperhemoglobinemia in your body, and in severe cases, it may even lead to a lack of oxygen in the body, and even life risk. <

There are a lot of those tiny bugs that are not visible to the naked eye. Of course, like these bugs doesn't have to be easily cleaned off. There are also those black spots caused by pesticides, which have black spots in many aspects in more than one aspect, and sometimes they are chemical fertilizers.

Sometimes there are some small black spots on the cabbage, they may appear on the leaves, or they may appear on the stems, and you can wash them in clean water. For such small black spots, it is generally due to lesions.

It will make the Chinese cabbage bitter and the quality worse. In addition, it can be infected with black spot on the leaves of Chinese cabbage and various other parts. At first, green spots of primary color will appear, and then they will turn grayish-brown or brown.

There will be a yellow halo around it, after which the leaves will dry up and turn yellow. A black mold layer will appear in wet conditions.

First of all, this disease is very contagious, as long as a cabbage has such a disease, other cabbage will also be sick, and it will also cause the cabbage to reduce production, the growth of cabbage to stop, so that the whole leaf is black and rotten.

Peanuts also need to play mequat during the period of lush branches and leaves, which is to prevent the branches and leaves from flourishing, only seedlings do not bear fruit, so planting Chinese cabbage must be left in advance of the spring land, and be prepared to plant Chinese cabbage, otherwise it will really lead to many diseases and disasters of Chinese cabbage! The possible reason for this may be that it is more likely to be confused by vegetable farmers with other diseases. Now, the rural fireflies will review some knowledge about the prevention and control of Chinese cabbage white spot disease with everyone, so as to be a prepared vegetable farmer for the prevention and avoidance of white spot disease when planting Chinese cabbage in the coming year.

As the disease worsens, the lesions will gradually expand, and the color will slowly change from gray-brown to white, and a pale green halo will appear around the lesions, until finally the disease is severe, and the lesions will become translucent due to drying, expanding and contiguous, causing the leaves to dry up and die.

The outer edge of the lesion is pale yellow halo, there is a light gray mold layer on the back of the lesion when the humidity is high, the lesion becomes thin and translucent in the later stage, and the perforation and rupture when drying, and the leaf is dried up when the lesion is more, which directly affects the yield and quality of cabbage, and is a common disease of cabbage planting. In the process of growth and development, such a good Chinese cabbage is often infected by white spot disease, resulting in leaf spots. Blight, how can we prevent and control vitiligo?

This article introduces the identification, harm, transmission, occurrence conditions and prevention methods of vitiligo.

Cabbage virus disease (the main symptoms are: seedlings are sick, and the heart leaves appear bright veins or rock leaf veins lose green, and then produce pale green mosaic leaves or mottled symptoms.) The disease occurs at the adult stage, and the damage is mild or the disease can catch the ball in the later stage, but the manifestations are different, and small brown lesions appear on the veins and petioles of the leaves).

The pathogen overwinters on the soil or vegetables with the residual disease, and germinates and infects the seedlings when the conditions are suitable in the spring of the following year, and the average temperature of the epidemic is about 16 °C, and the lesion expands the fastest at 16 to 20 °C. It is easy to occur when there is low temperature and rain, high and low temperature, large temperature difference between day and night, and large dew.

The lesions on the leaves are scattered at first, the gray-brown round small spots, it will expand into white amorphous lesions when it grows up, there are light yellow-green halos around the lesions, and under humid conditions, the back of the lesions produces a sparse light gray fog layer after the lesion, and the white translucent leaves die in advance after the lesion is roasted and fire-like.

The lesions on the leaves are scattered gray-brown round small spots at first, and then expand into gray-white amorphous lesions, with pale yellow-green halos around the lesions. Under wet conditions, a sparse pale gray mold layer develops on the back of the lesion. Later, the lesions become white and translucent, often ruptured and perforated.

When there are many lesions, the leaves die early. The leaves of the diseased plant are dried up layer by layer from the outside to the inside, like a fire.

Control the field humidity in the disease-prone period, the field humidity is high, and the disease is severe. Seedlings are set at the appropriate time. According to the characteristics of Chinese cabbage varieties, soil fertility and other factors, the appropriate plant spacing should be used to set seedlings at the appropriate time (Taiyuan area can not be later than early September) to improve the field ventilation conditions.

Watering wisely. In the disease-prone period, it is necessary to "look at the sky, the ground, and the growth of Chinese cabbage" and water the furrow in a timely and appropriate manner, and avoid raining days after watering. Stagnant water in the field should be drained as soon as possible.

Foliar fertilization If the plant is weak, in addition to strengthening the management of water and fertilizer, potassium dihydrogen phosphate or 1% red (white) sugar can also be added to the sprayed solution to supplement nutrients to the foliar surface.

Hello, in the case of everyone planting Chinese cabbage, the occurrence of small black spots on the petiole of Chinese cabbage is a very widespread situation, and the small black spots on the Chinese cabbage are some diseased Chinese cabbage petiole somatic cells have changedThere are many grayish-black patches at the altered petioles. If there are not many small black spots on the petiole of Chinese cabbage, it is likely that the grower uses too much base fertilizer in the cultivation situation, which is a physiological disease caused by too much chemical fertilizer, and the balance of nutrients is destroyed, which in turn leads to the black transformation of plant cells.

It is also possible that the Chinese cabbage is suffering from black spot disease. After the occurrence of black spots in Chinese cabbage, it will gradually expand and rot, the disease will be hollow, and the petiole will gradually fall off after it is broken, which will lead to the death of Chinese cabbage. Chinese cabbage black spot disease is a disease that harms the growth and development of Chinese cabbage, and is a disease caused by the bacteria and viruses of black spot.

Key routes of transmission: in the seed belt, airborne transmission and soil retention.

Because the seeds themselves contain black spot pathogens, it will immediately cause Chinese cabbage to get black spot disease. Spread in the air, generally appear in high temperature and high humidity, Chinese cabbage in the middle and late stage of growth and development is very susceptible to the external food crops black spot fungus pollen and disease. The retention of soil layer is the main factor for the occurrence of Chinese cabbage black spot disease.

Chinese cabbage is planted continuously, and the black spot disease that occurred in the previous year may be mild and undetected, but it will be more serious in 2022. Ways to prevent and prevent Chinese cabbage black spot disease: Planting with high-quality disease-resistant Chinese cabbage seeds.

Prevent continuous planting. The implementation of rotation planting of Chinese cabbage can reasonably prevent Chinese cabbage black spot disease and reduce the occurrence of diseases that harm Chinese cabbage such as black spot disease. Drug prophylaxis.

InIn the middle and late stages of black spot disease in Chinese cabbage, 500 times of mancozeb can be used to prevent Chinese cabbage spray. Mancozeb is a broad-spectrum and high-efficiency pesticide fungicide, which is slightly toxic to humans and animals, and can reasonably prevent Chinese cabbage black spot disease and other diseases.

Both sides of Chinese cabbage leaves can be infected with black spot disease, and the diseased leaf spots infected by black spot disease are round or almost round, brown in color, 2-10mm in diameter, with obvious concentric wheel patterns, often accompanied by yellow halos, and fine black mold on top. The lesions on the petiole are long fusiform, dark brown in color, and have a wheel pattern in shape. Prevention and control need to avoid collars with early-maturing Chinese cabbage; Strengthen cultivation management, do a good job in fertilization and watering; Reasonable dense planting to improve the disease resistance of Chinese cabbage plants; Clean up the diseased leaves in the field in time to prevent the reproduction of pathogens.

Seed treatment Before sowing, the planting is carried out with 70% Fumei double wettable powder according to the amount of seeds, which is conducive to improving the disease resistance of the plant.

Round, brown in color, about 2 4 mm in diameter, the leaves will die locally; First of all, the seeds should be treated before sowing to improve the disease resistance of the seeds, and some drugs should be sprayed to control pests and diseases during the onset of the disease.

It can be identified by a few spots on the bok choy. I think we must pay attention to the planting method of Chinese cabbage, and also pay attention to the prevention of diseases, so that we can ** this disease.

If the black spots grow on green leaves and can be rinsed with water, they are usually caused by small insects, which may be the feces of vegetable insects, or particulate matter or soil in the environment. If these black spots are washed with water, in these cases, they can be eaten after washing. If these black spots can be washed off with water, it is likely to be the feces or mud of some insects, just wash them clean, there is no problem.

If the black spots can't be washed off and are scattered on the cabbage leaves, it may be that the cabbage is sick.

First of all, the black spots found on the inside of the cabbage gang are very likely to be caused by insects. I remembered a popular joke not long ago, which said that during the growth of cabbage, one leaf after another, it was wrapped in leaves, so everything was dirty. secondly, there are small black spots on the cabbage leaves and cabbage gangs, some sparse and some dense; Some of them are dark and some are light, like freckles, scattered scattered as if they were seeping into the fibers of the cabbage, but they cannot be washed off.

The appearance of dark spots on the inside of the cabbage gang is used by farmers during the growth of cabbageToo much nitrogenThe physiological dark spots that appear do not affect consumption. If the cabbage is attacked by aphids, it may leave a black powdery substance on the cabbage leaves, which is the secretion of the aphids, and some small black dots on the cabbage that cannot be washed off with water. These small black dots are the ones that come with the cabbage.

That is, in the process of cabbage growth, due to various factors such as climate, soil, lack of fertilizer or more fertilizer, cabbage disease.

Small black spot disease is actually caused by damage to the cell membrane of vegetables, which is a physiological disorder of vegetables, which is affected by moisture, temperature and environment. If too much nitrogen fertilizer is used in the process of cultivating cabbage, it will form black spots for a physiological disease, or the lack of water during the growth of cabbage, the unsuitable climate or the lack of calcium caused by too much nitrogen fertilizer, this problem may occur.

Cabbage will have some black spots, and the size is different, it is also irregular shape, and the branches and leaves will also be particularly wilted, and there will be no luster, etc., these are the symptoms of cabbage black spot disease.

You will find that the outermost leaf of the leaf is yellow, and there are many black spots on it, and it looks like there is a white layer, which is obviously problematic.

The symptoms of cabbage black spot disease are round green spots at first, and then slowly expand into light green to dark brown edges, with obvious concentric ring patterns and yellow halos around them. When the humidity is high, there is black mold on the lesions, and in severe cases, the lesions merge into large plaques, causing the leaves to die.