What to do if cabbage leaves have yellow spots? What is the cause of the macular of Chinese cabbage

<> Disinfection of seeds Generally, the coated seeds of disease-free plants are selected, and if the seeds are not coated, the seeds can be sterilized with seed dressing or soaking agent to prevent and control leaf spot.

Strengthen management Pathogens can be spread through rainwater, so vegetable plots need to be cultivated in high terrain, cultivated in deep trenches, and have good drainage to ensure that there is no water accumulation and reduce transmission. Vegetable plots can be rotated with water and dry plants to strengthen cultivation management.

Clean up the diseased plants When the disease occurs, it is necessary to remove the diseased leaves in time, pull out the diseased plants, take them out of the field for centralized burning, and apply pesticides or put quicklime on the diseased holes.

After the cabbage is harvested, deep ploughing is carried out to remove the remaining residual leaves, water and fertilizer are replenished in time, and fertile leaf foliar fertilizer is applied to promote its normal growth.

There are yellow spots on the leaves of cypress, which may be due to infection with leaf spot, leaf spot is a common disease of vegetables, after infection, the leaf ** part changes from brown to gray, the edge of the leaf shows a light yellow halo, and the lesion on the back of the leaf will be dark green.

After the cabbage is infected with leaf spot disease, it is necessary to immediately remove the diseased leaves, and destroy the diseased leaves in a concentrated manner, and then spray the plants with 50% Tobuzin wettable powder 500 times, 75% chlorothalonil 600 times or 80% anthrax Fumei 500 times and other agents, spray once every 7-10 days, and spray 2-3 times continuously.

It should be downy mildew of cabbage, when the leaf is diseased, the first water-soaked green spots are produced, and with the development of the disease, white downy mildew is produced on the back of the lesions, and the lesions gradually turn yellow to yellow-brown, and the expansion of the lesions is polygonal due to the restriction of leaf veins. However, it is also amorphous. Severe disease can cause the whole leaf to dry up.

The peduncle and seed pod are fat, distorted, and have pitted brown lesions, and when wet, they have white downy mildew.

Can be used with Frosturea · Manganese-zinc, downy mildew, ethylphosphine aluminum · Manganese-zinc, methae, manganese-zinc, enoylmorpholine, downy mildew · Plague net, silver farry (flumichlor. Dimycocarb), Pulik (downy mildew hydrochloride) and other foliar fertilizer sprays, sprayed continuously once every 7 days.

Ask the experts, what kind of fungicide is used? How many times in a row?

Summary. Hello, I am glad to answer for you that Chinese cabbage leaves have macular spots, which can be sprayed with copper ammonia water, agricultural streptomycin sulfate soluble powder or neophytomycin, after dilution.

What medicine is used for macular macula in small cabbage.

Hello, very unbridled Hui quietly happy to answer the Chinese cabbage leaves with yellow spots can be used with copper ammonia water, agricultural streptomycin sulfate soluble powder or neophytomycin, the cracked residue can be diluted and sprayed.

1. Cut off the cabbage leaves infected with the macula, and then spray 500 times of 50% Tobuzin wettable powder to solve the problem; 2. Use mancozeb wettable powder, spray 2 3 times every 7 days, and it can be solved; 3. Use 1000-2000 times of 25% amisidad (azoxybacterium) suspension agent to carry out ** i.e., trembling; 4. Use 1000 times of Puli Cave Oak Water Agent for prevention and control.

Do you mix these types together?

It's not a mix of pros, these methods are fine.

Summary. Hello, I am happy to answer for you, the yellowing of cabbage leaves may be caused by lack of water, excessive fertilization or alkaline soil, when breeding cabbage, you need to water 1-2 times every other week to keep the soil moist, and fertilize according to the growth state of cabbage, so as to avoid its fertilizer damage.

What's the matter with the yellowing of Chinese cabbage leaves.

Hello, I am happy to answer for you, the yellowing of cabbage leaves may be caused by lack of water, excessive fertilization or alkaline soil, when breeding cabbage, you need to water 1-2 times every other week to keep the soil moist, and fertilize according to the growth state of cabbage, so as to avoid its fertilizer damage.

Kiss <>, cabbage leaves yellowing may be the following reasons: 1. Lack of water Cabbage needs sufficient water in the growth process, when breeding cabbage, if the watering is too little, it will lead to a lack of water in the plant, which makes the leaves of cabbage yellow, and it needs to be watered 1-2 times every other week to keep the soil moist, but in the rainy season, it is necessary to discharge the water in the soil for the cabbage to avoid its poor growth. 2. Excessive fertilization of cabbage is not tolerant of thick fertilizer, breeding cabbage, if it is fertilized too much, it will lead to fertilizer damage to the plant, which will make the leaves of cabbage rot and yellow, and it is necessary to adjust the frequency of fertilization according to the growth state of the plant, and regularly spray potassium dihydrogen phosphate on the leaves of cabbage to delay the senescence of plant leaves.

3. Soil alkaline cabbage is suitable for growing in slightly acidic soil, when breeding cabbage, if the soil is alkaline, it will lead to poor plant growth, which makes the leaves of cabbage yellow and wilting, it is necessary to apply ferrous sulfate in the soil to adjust the acidity and alkalinity of the soil, and when watering cabbage, alkaline water can not be used. 4, the control of pests and diseases of the leaves of the cabbage yellowing may be caused by pests and diseases, the maintenance of cabbage, the need to regularly observe the growth state of the plant, if found on the leaves of the cabbage on the insect spots, it is necessary to uproot the seriously infected disease plant and burn, and to spray 1-2 times every other week sterilization agent, so that the cabbage healthy growth.

Kiss, the reason for this is too much fertilization, which is what we often call burning the leaves. <>

Summary. 1. Lack of water cabbage needs sufficient water in the growth process, when breeding cabbage, if the watering is too little, it will lead to a lack of water in the plant, which will make the leaves of the cabbage yellow, and it needs to be watered 1-2 times every other week to keep the soil moist, but in the rainy season, it is necessary to discharge the water in the soil for the cabbage to avoid its poor growth. 2. Excessive fertilization of cabbage is not tolerant of thick fertilizer, breeding cabbage, if it is fertilized too much, it will lead to fertilizer damage to the plant, which will make the leaves of cabbage rot and yellow, and it is necessary to adjust the frequency of fertilization according to the growth state of the plant, and regularly spray potassium dihydrogen phosphate on the leaves of cabbage to delay the senescence of plant leaves.

3. Soil alkaline cabbage is suitable for growing in slightly acidic soil, when breeding cabbage, if the soil is alkaline, it will lead to poor plant growth, which makes the leaves of cabbage yellow and wilting, it is necessary to apply ferrous sulfate in the soil to adjust the acidity and alkalinity of the soil, and when watering cabbage, alkaline water can not be used. 4, the control of pests and diseases of the leaves of the cabbage yellowing may be caused by pests and diseases, the maintenance of cabbage, the need to regularly observe the growth state of the plant, if found on the leaves of the cabbage on the insect spots, it is necessary to uproot the seriously infected disease plant and burn, and to spray 1-2 times every other week sterilization agent, so that the cabbage healthy growth.

Yellowing of cabbage leaves may be caused by lack of water, excessive fertilization or alkaline soil, when breeding cabbage, it is necessary to water 1-2 times every other week to keep the soil moist, and fertilize according to the growth state of cabbage, so as to avoid its fertilizer, and to apply ferrous sulfate to the soil to make the soil slightly acidic.

1. Lack of water cabbage needs sufficient water in the growth process, when breeding cabbage, if the watering is too little, it will lead to a lack of water in the plant, which will make the leaves of the cabbage yellow, and it needs to be watered 1-2 times every other week to keep the soil moist, but in the rainy season, it is necessary to discharge the water in the soil for the cabbage to avoid its poor growth. 2. Excessive fertilization of cabbage is not tolerant of thick fertilizer, breeding cabbage, if it is fertilized too much, it will lead to fertilizer damage to the plant, which will make the leaves of cabbage rot and yellow, and it is necessary to adjust the frequency of fertilization according to the growth state of the plant, and regularly spray potassium dihydrogen phosphate on the leaves of cabbage to delay the senescence of plant leaves. 3. Soil alkaline cabbage is suitable for growing in slightly acidic soil, when breeding cabbage, if the soil is alkaline, it will lead to poor plant growth, which makes the leaves of cabbage yellow and wilting, it is necessary to apply ferrous sulfate in the soil to adjust the acidity and alkalinity of the soil, and when watering cabbage, alkaline water can not be used.

4, the control of pests and diseases of the leaves of the cabbage yellowing may be caused by pests and diseases, the maintenance of cabbage, the need to regularly observe the growth state of the plant, if found on the leaves of the cabbage on the insect spots, it is necessary to uproot the seriously infected disease plant and burn, and to spray 1-2 times every other week sterilization agent, so that the cabbage healthy growth.

Melanoma.

Cabbage leaf spot is a common disease of cabbage throughout the growing season. Main symptoms: ** part from brown to gray-white, the periphery is a pale yellow halo, the periphery of the lesion on the back of the leaf is dark green, the later lesion becomes white and translucent, and finally ruptures and perforation.

The lesions are round, 2-6 mm in diameter, light brown or black-brown, with concentric rings, and often surrounded by yellow halos. There is black mold on the lesions, that is, the conidia of the fungus and its spore stalks. The petiole lesions are elongated and fusiform, with the same characteristics as the leaf lesions.

The leaves, stems, peduncles and pods of the remaining plants can also be damaged. In severe cases, the leaves are covered with diseased spots, turning yellow and dry.

There are basically three reasons for this, one is a nutritional problem, two is a temperature problem, and three is an air quality problem. However, now the weather is hot should be a little more hot, pay attention to watering, the water should not be too wet, the soil is too wet, the weather is hot, the plant is stuffy in it, and it is easy to rot the roots. Try to choose soil with good aeration.

The yellowing of Chinese cabbage leaves can be caused by lack of fertilizer, excessive soil moisture, insufficient moisture, or insect infestation. Cabbage is a common vegetable in daily life, and its leaves are generally green in color, but sometimes you can see yellow leaves of Chinese cabbage, and there are many reasons for this.

1. The yellowing of Chinese cabbage leaves may be due to lack of fertilizer and malnutrition, and the leaves will be yellowed due to lack of nutrients.

2. The soil moisture of planting Chinese cabbage is too much, which causes the roots of Chinese cabbage to rot, and the cabbage leaves will lose their luster and gradually turn yellow.

3. Lack of water, which is similar to lack of fertilizer, is caused by insufficient nutrients to cause yellowing of leaves.

4. Insect infestation occurs in cabbage.

Yellowing of the leaf edges of vegetables (Chinese cabbage) is caused by a lack of trace elements. For example, potassium deficiency in Chinese cabbage will cause white or yellowish-white spots of different sizes to appear on the edge of the leaves, and then expand and become blighted spots, and finally the leaf edges will wither due to bacterial infection, and the old leaves will wilt and fall off early; For example, the lack of calcium in cabbage will cause the inner leaf margin or concentric leaves to turn brown and dry up; Magnesium deficiency can also cause vegetable leaves to turn yellow (white) from the edges, gradually extending inward or yellowing and whitening of all leaves except for the sides of the veins.

Prevention and control methods: corresponding measures can be adopted according to specific symptoms. For example, potassium deficiency can be used as a potassium fertilizer.

Calcium deficiency is available. 5% calcium chloride foliar spray, 1 time every 7 days, 2 3 sprays in a row; If the soil is acidic and calcium deficient, lime can be applied. Magnesium deficiency can be sprayed with 1% 2% magnesium sulfate on leaves, 5 7 days 1 time, spray 3 5 times; Calcium, magnesium and phosphorus fertilizers can also be applied, and the application rate of potassium and nitrogen fertilizers can be appropriately controlled.

One is yellow, that is, too much water causes the soil to accumulate water for a long time, poor air permeability and even some fibrous roots rot. It shows that the young leaves are dark yellow and dull, and the new shoots are shriveled.

The second is fat yellow, that is, fat, which is manifested as the tip of the old leaves turning yellow and falling off, and the new leaves are thick and shiny, but generally uneven and unstretched. You can sprinkle a layer of radish seeds and pull them out after a few days of emergence to consume nutrients.

The third is dry yellow, due to long-term lack of watering or dehydration, although the new leaves are normal in color, the lower leaves gradually dry up and fall off and age.

Fourth, it is alkali yellow, and the water quality in the north is alkaline, and the leaves gradually fade, turn yellow or even fall off. The easiest way to do this is to pour fermented rice washing water or rainwater.

The first reason why the cabbage field is yellow is because the land is too dry due to insufficient watering. This reason will cause the cabbage to turn yellow, if the weather is dry, the cabbage will not be replenished with water for a long time, the cabbage will turn yellow, and even dry up and die.

In a humid environment, when the soil is moist or even when water accumulates, the soil will become less permeable. The root system of the cabbage in the ground will rot and die. In this way, the baby cabbage will naturally turn yellow.

The soil is too fertile. Baby cabbage grown in overly fertile soil will also turn yellow. This is not a fantasy, but because when the cabbage grows, the demand for fertilizer is not particularly large, but many people will use a lot of base fertilizer when planting cabbage.

Cabbage can also cause cabbage leaves to turn yellow because of excessive nutrition.

The last reason why cabbage is easy to turn yellow is that the soil environment is not suitable. Because when planting cabbage in rural areas, it is rare to plant it for many years. When planting in rural areas, it is more about rotation and intercropping.

There are yellow spots on the cabbage leaves, first of all, the seeds should be sterilized, try to use coated seeds, if not, you can use seed dressing or soaking agent to sterilize the seeds. Then it is necessary to strengthen the cultivation and management of vegetable fields, dredge more, avoid water accumulation, and carry out crop rotation. Remove diseased leaves and diseased plants in time, apply fully decomposed organic fertilizer, and improve the disease resistance of vegetable soil.

After the onset of the disease, spray antibacterial agents in time for prevention and control.

1. Disinfect the seeds.

Generally, the coated seeds of disease-free plants are selected, and if the seeds are not coated, the seeds can be sterilized with seed dressing or soaking agent to prevent and control leaf spot.

2. Strengthen management.

Pathogens can be spread by rainwater, so vegetable plots need to be cultivated in high terrain, cultivated in deep trenches, and well drained to ensure that there is no water accumulation and reduce transmission. Vegetable plots can be rotated with water and dry plants to strengthen cultivation management.

3. Clean up the diseased plants.

When the disease occurs, it is necessary to remove the diseased leaves in time, pull out the diseased plants, take them out of the field for centralized burning, and apply pesticides or put quicklime on the diseased holes. After the cabbage is harvested, deep ploughing is carried out to remove the remaining residual leaves, and it is dried for more than three weeks before use. Diseased leaves can be fully rotted and applied to vegetable fields to improve disease resistance.

Fourth, spraying chemicals.

In the early stage of the disease, the diseased leaves can be sprayed with targeted agents for prevention and control. Fungicides can be used for control in the initial stage, focusing on the base of the diseased plant and near the surface. You can use 75% chlorothalonil 600 times solution, 80% anthrax forme 500 times solution, 1:

Antibacterial agents such as 1:400 Bordeaux liquid can be sprayed again at an interval of 7-10 days, and 2-3 sprays can be sprayed.