What s the deal with cabbage rotten leaves? How to treat rotten leaves of Chinese cabbage

After the beginning of autumn, many farmers began to plant Chinese cabbage, but Master Liu, who has always been very active, did not plant this year, he said: "Last year, I planted a few acres of cabbage, the outside looks good, the leaves are also green, but after cutting, the leaves inside are dry leaves, and some have rotten cabbage, neighbors said that it may be the cause of heavy stubble, or it may be the occurrence of leaf spot, and I dare not plant it again this year." ”

Master Liu is not the only one who has encountered such a problem, but other farmers have also encountered the problem of cabbage rotten leaves and rotten hearts, so what is going on?

1. Calcium deficiency. As Master Liu said, there is no problem outside, but after cutting, the heart leaves will dry up and rot the leaves, which is due to cabbage heart rot caused by calcium deficiency. The onset site of this disease is mainly in the center of the leaf bulb, and the main characteristics are the yellowing of the old leaves and the rot of the heart leaves.

Prevention and control methods: When fertilizing the land, calcium should be supplemented, quicklime or lime can be sprinkled, or rotten farmhouse fertilizer can be used. You can also spray chelated calcium fertilizer before wrapping the core, spray it from top to bottom, and spray it evenly with 40 grams of chelated calcium fertilizer in a bucket of water.

Or use superphosphate liquid solution.

2. Soft rot.

In addition to this condition, there is also a type of rot that starts at the base of the cabbage stem, begins to rot at the junction with the cabbage outlet, and then gradually spreads to the heart leaf, which is the soft rot of cabbage, a bacterial disease that is prone to occur during the balling stage.

Prevention and control methods: In the prevention and control, copper preparations can be used, such as copper hydroxide or king copper, with an interval of 7 to 10 days, and the second time is alternately used. For the second use, iprodione and neophytomycin can be used.

Cabbage soft rot will also cause huge losses during storage, so choose varieties with strong disease resistance, strengthen field management, and spray pesticides in advance to prevent soft rot.

Cabbage rot is generally caused by calcium deficiency and soft rot, so those who have planted cabbage do not have to worry, understand the prevention and control methods in advance, do a good job in field management, and prevent in advance, or can ensure the yield of cabbage.

Chinese cabbage leaf rot is generally caused by calcium deficiency and soft rot.

Therefore, those who have planted cabbage do not have to worry, understand the prevention and control methods in advance, do a good job in field management, and prevent in advance, or can ensure the yield of cabbage.

There are many reasons for Chinese cabbage leaf rot, generally common, there are pathogens in the soil, pests and diseases on the foliage, excessive boiling water, inadequate management, etc., many reasons lead to this phenomenon.

There are two possibilities for Chinese cabbage leaf rot, one is that it has suffered from pests and diseases, and the other is that it may be caused by cloudy weather, too long time, and too much moisture.

Chinese cabbage rotten leaves are commonly bitten by pests and then pull excrement on it, pollute the leaves, usually watered or rainy, wet, the leaves are easy to rot, so it is found that Chinese cabbage is pested to a variety of ways to control pests.

Soft rot: Spread mainly by insects, rainwater, irrigation water and infected manure. Calcium deficiency:

Cabbage heart rot caused by calcium deficiency. Virus disease: In severe cases, it will lead to dwarfing and even death of seedlings, and it should be treated with plant disease emulsion.

Downy mildew: Prevent with 58% methalene, manganese-zinc or 64% alum 400 times.

1. Soft rot

After Chinese cabbage is infected with soft rot and sclerotinia sclerotinia two diseases, there will be leaf rot, soft rot is mainly transmitted by insects, rainwater, irrigation water and infected manure, and the bacteria can also invade from wounds and cracks, and sclerotinia sclerotinia mostly occurs from the base of the ground petiole.

2. Calcium deficiency

The outer layer of Chinese cabbage does not rot, but the heart leaves dry up and erosive after cutting, which may be due to the cabbage heart rot caused by calcium deficiency, which mainly occurs in the center of the leaf ball, and the symptoms are turned into old leaves withered and yellow, and heart leaves are ulcerated.

3. Viral diseases

After the Chinese cabbage is invaded by the virus disease, the heart leaves are transparent at first, and gradually fade green along the leaf veins, resulting in light green and dark green conditions, the leaves become wrinkled, and in severe cases, the seedlings are dwarfed and even die, which should be treated with plant disease emulsion.

4. Downy mildew

Chinese cabbage may be infected with downy mildew from seedling stage to flowering stage, and the leaves of adult plants are most seriously damaged, which can be prevented with 58% methalene-manganese-zinc wettable powder 500 times or 64% alum wettable powder 400 times, sprayed once every 7 days, sprayed 3 times in a row.

The rotten leaves of Chinese cabbage can be controlled by alternating bacterial drugs such as thiasen copper, or thioxene copper, or agricultural streptomycin, or mesomycin, or thiamethone, or quinoline copper, or choosing two components with the same mechanism of non-nuclear volcanic volcanic and potassium dihydrogen phosphate. 5 days to change the brigade to carry the times, continuous spraying of more than 2-3 times. The vegetables that are sick here should be removed from the ground and destroyed in time.

Recommended medications, e.g., copper thioxamethoxene + thiamethone + potassium dihydrogen phosphate.

If the cabbage does not grow and has rotten leaves, it may be caused by insufficient nutrients in the land, or a serious lack of water and fertilizer**, or it is infested by some kind of virus.

Therefore, at this time, we should ensure sufficient water and fertilizer, spray some insecticides appropriately, and then slowly observe for a few days, and the situation that cabbage does not like to grow should be improved.

Flush some organic fertilizer, use fungicide, and spray a series of pure natural plant-derived suspension products at two or three o'clock in the afternoon.

Root rot is a common disease of Chinese cabbage during planting, which will lead to the gradual death of Chinese cabbage, which seriously affects the yield and quality and reduces the economic benefits of farmers. So what causes Chinese cabbage root rot? What about rotten roots?

Let's take a closer look.

Causes of root rot of Chinese cabbage and prevention methods.

1. Rotten roots caused by roots.

Chinese cabbage is a semi-cold vegetable, prefers a mild and cold climate, is neither cold nor heat tolerant, and at the same time prefers a humid environment, but is not waterlogged. In the environment of high temperature or low temperature at the time of planting, if there is too much water accumulation in the soil during heavy rains during the rainy season, it will lead to necrosis of the root system due to lack of oxygen, resulting in root pruning. In addition, if the Chinese cabbage is in the high temperature period in the early growth stage, the high-temperature root will appear; On the other hand, in the late growth stage of Chinese cabbage, if the temperature is too low, low-temperature roots will appear.

Causes of root rot of Chinese cabbage and prevention methods.

2. Root rot caused by soft rot.

Soft rot is also one of the causes of root rot of Chinese cabbage, which is very prone to soft rot when planted on higher terrain and prone to water accumulation, and excessive application of nitrogen fertilizer, or insect bite or damage to the plant, resulting in the invasion of pathogens and infection of soft rot. Soft rot mainly harms the rhizome, the petiole appears water-stained, the outer leaf loses water and wilts, and the rhizome rots when the disease is severe. It is full of yellow sticky, emits a peculiar foul odor, and causes the whole plant to rot.

Causes of root rot of Chinese cabbage and prevention methods.

3. Preventive measures for rooting.

Choose a plot of land with higher terrain and good drainage to plant, so as to avoid excessive soil water accumulation and lead to the phenomenon of rooting, in the early stage of growth, in case of high temperature climate, you can go to shading measures to prevent high-temperature roots; In the later stage of growth, the low temperature can be increased by mulching and fertilizing to prevent low-temperature rooting. During planting, weeding can be done through tillage to increase the permeability of the plant, so that the root system can breathe and stretch normally, and in the later stage of growth, tillage can also improve the low temperature, so that it can reduce the probability of frost damage. Drain water in time after rain to prevent rain and waterlogging, and it is strictly forbidden to flood irrigation when watering, so as not to root up.

Causes of root rot of Chinese cabbage and prevention methods.

4. Soft rot prevention and control methods.

Precautions against soft rot are also avoided on low-lying, sticky plots, and solanaceae, melons and fruits, and cruciferous vegetables should be avoided before planting plots. At the onset of the disease, it can be sprayed with agricultural streptomycin sulfate or neophytomycin, once a week, and sprayed 2-3 times continuously depending on the condition.

Causes of root rot of Chinese cabbage and prevention methods.

The above are the causes of Chinese cabbage root rot and the prevention and control methods.