What is the dark spot on cabbage? Can you eat Chinese cabbage with dark spots

The black spots on cabbage may first of all be a physiological disease of growth. During the cultivation process, when there is too much nitrogen fertilizer, cabbage is prone to black spots. Another possibility is that the cabbage is infested with aphids, and these black spots are aphid carcasses that grow into the cabbage as the cabbage grows; It is also possible that the cabbage is not stored properly, rots, and is prone to black spots.

The black spots caused by the first two causes are not caused by viruses or molds, and there is no definite research on whether they are harmful to the human body. Generally speaking, if there are sporadic black spots, it will not affect the consumption, but if there are many black spots and the appearance is not good, it is best not to eat. The cabbage with black spots due to mildew is easy to be poisoned after eating, because the cabbage contains nitrate, which is not toxic, but during the decay process, nitrate will be converted into toxic nitrite.

When nitrite enters the bloodstream, it oxidizes low hemoglobin to methemoglobin, depriving the blood of its ability to carry oxygen. After eating rotten cabbage, even a slightly rotten cabbage leaf, the body will experience dizziness, nausea, palpitation, shortness of breath and other phenomena within two or three hours due to lack of oxygen, and in severe cases, cramps, coma, and even life-threatening. Most of the cabbage is stored in the northern winter season, and if there are black spots on the leaves when eating, it is better to throw away the dense parts of the black spots, just in case.

What exactly is this black spot on cabbage, and can you eat it? Experts give answers, and it's not too late to know.

1. The cabbage is attacked by aphids, and these black spots are aphid corpses, which grow into the cabbage with the growth of the cabbage;

2. The cabbage with black spots derived from orange balls due to mildew is easy to be poisoned after eating, because the cabbage contains nitrate, which is not toxic, but in the process of decay, nitrate will be converted into toxic nitrite; When nitrous chamber salts enter the bloodstream, they oxidize low hemoglobin to methemoglobin, causing the blood to lose its ability to carry oxygen.

3. If you eat rotten cabbage, even if it is a little rotten cabbage leaves, your body will experience dizziness, nausea, palpitation, shortness of breath and other phenomena within two or three hours due to lack of oxygen, and in severe cases, you will have cramps, coma, and even life-threatening.

Eatable.

This black sesame-like spot, although it looks a little disgusting, looks very dirty, many people think they can't eat it when they see it for the first time, but in fact it's not, these spots are the physiological diseases of cabbage, there is no ***, except for growing a little ugly, it has no effect on the taste and texture of cabbage, and it has no effect on us, so you can eat it boldly and with confidence.

The reasons for the appearance of these black spots are:

There are three main reasons why cabbage can produce small black spots. One is the variety of cabbage itself, some cabbage varieties have poor immunity to small black spots, so they are easy to grow small black spots, and the probability of small black spots is different between different varieties. It's like there's a difference between different races, and the white race is taller and stronger than us yellow people.

Another is that when the cabbage is stored and transported, the conditions are not suitable and black spots will be produced, and the transportation is bumpy and bumpy, or the temperature is too high, there are no black spots, and after arriving at the destination, it is found that there are black spots. It is best to store and transport cabbage at a temperature below 4 to help prevent the formation of black spots.

Another is that vegetable farmers overapply fertilizer in the process of planting vegetables, mainly due to the influence of nitrogen fertilizer. Excessive addition of nitrogen fertilizer and eutrophication will destroy the cell structure of cabbage, and the nutrients inside the cells will be out of balance, and the cell walls will be distorted, thus turning black, and small black spots will be formed, as if obesity from eating too much. These are the two reasons why cabbage grows small black dots.

1.It can be rotated with leguminous, melon and nightshade crops for 2-3 years. According to the growth needs of Chinese cabbage, formula fertilization, more well-rotted high-quality organic fertilizer, and increase phosphorus and potassium fertilizer.

Reasonable hoop water, small water irrigation at the seedling stage, appropriate water control at the rosette stage, and sufficient water and fertilizer at the core stage. After the Chinese cabbage is harvested, the field disease residues should be removed in time, and the field should be buried or burned in time to reduce the source of disease in the field.

2.Seed treatment, which is applied prior to sowing reduces morbidity in the field. With 50% iprodione wettable powder, 50% pythium presol wettable powder or 50% carbendazim wettable powder, plus 50% fumei double wettable powder, you can press 0 of the seed weight.

Seed dressing. 3.In field investigation, the following fungicides can be used for prevention before the onset of Chinese cabbage black spot disease to the early stage of the disease:

25% bromonitrile wettable powder 500-1000 times liquid + 70% mancozeb wettable powder 700 times liquid;

50% methyl sulfur suspension 800 1000 times liquid + 70% mancozeb wettable powder 700 times liquid;

50% Pythium 1000 1500 times liquid + 50% grammedan wettable powder 400 600 times liquid;

50% fumeidil iprodione wettable powder 800 1000 times liquid;

600-800 times of 70% propylene multibacterial wettable powder;

100 times of benzyl WP + 600-800 times of 70% zinc propylene wettable powder;

64% hydrogen-copper-Fumei zinc wettable powder 1000 times liquid;

50% methyl rice multi-wettable powder 1500 2000 times liquid + 70% dysen joint dry suspension 800 times liquid;

600-800 times of 47% chunleimycin copper oxychloride wettable powder + 800 times of 70% dysenlian dry suspension;

Spray water evenly, once every 7-10 days depending on the condition.

When there are many plants in the field, high-resistance varieties should be selected to strengthen the control. When the onset of the disease is more common, the following fungicides or formulations can be used for prevention and control

50% benzyl wettable powder 800-1000 times liquid + 75% chlorothalonil wettable powder 600 800 times liquid;

10% difenoconazole water dispersible granules 1000 times + 75% chlorothalonil wettable powder 600-800 times.

560g azine chlorothalonil suspension 800 1000 times liquid;

20% azolamine ester water dispersible granules 1000-1500 times;

75% oxime tebuconazole water dispersible granules 2000-3500 times;

Spray the water evenly, and spray l times every 5-7 days depending on the condition.

Cabbage is a vegetable that we often eat in our lives, and it is delicious and economical. The appearance of black spot disease in the process of Chinese cabbage planting seriously harms the growth of Chinese cabbage, so how to prevent and control Chinese cabbage black spot disease? This article will introduce the prevention and control measures of Chinese cabbage black spot disease.

1. Precautions.

1. Disease-prone plots. Fields with cruciferous vegetables and adjacent stubble, fields sown without seed treatment, fields with premature sowing, fields with high plant density, fields with insufficient basal fertilizer and top dressing, weak plant growth, and flooded lands are prone to disease.

2. Vulnerable vegetables. In addition to Chinese cabbage, radish, cabbage, rape (Chinese cabbage or green), cauliflower (cauliflower), etc., are susceptible to the disease, and the control measures can refer to Chinese cabbage.

2. Early spraying.

After the pathogen of black spot disease invades the leaves of Chinese cabbage, it can form lesions after 3-5 days, and black mold can grow on the lesions, and then invade the Chinese cabbage. Therefore, when there are lesions on the lower leaves of Chinese cabbage, you can spray the drug, you can use 75% chlorothalonil wettable powder 600 times, or 50% promethanine wettable powder 1500 times, or 50% Fumei double wettable powder 500 times, or 64% alum wettable powder 500 times, spray once every 7-10 days, spray 3-5 times, 50 kg per 667 square meters.

3. Control the humidity in the field.

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 in a timely and appropriate amount of watering, and should avoid raining days after watering. Stagnant water in the field should be drained as soon as possible.

Fourth, foliar fertilization.

If the plant growth 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 foliage.

Chinese cabbage black spot is a fungal disease, prone to disease in September and October every year, the main control measures are, seed treatment, seed mixing during planting, control of field humidity, early spraying, foliar fertilizer.

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.