The leaves in my garden suddenly turned black, what is the reason? Thank you

The blackening and darkening of the leaves of the vegetable garden are due to the accumulation of carbohydrates, excessive foliar fertilizer or drug hormones, or the superposition effect of hormones on the leaves by fertilization, and the blackening of the leaves will also occur. 1. Whether it's cucumbers or tomatoes, eggplants or peppers. The color of the leaves is normal and the color is bright green.

The darkening of the leaves is due to carbohydrate accumulation. The leaves combine water and fertilizer with light and carbon dioxide to produce light and matter. Redistribute to the individual cells of the plant.

If the temperature difference between day and night is too large, the temperature at night is too low, the daytime sunlight is sufficient, or the over-control is excessive, the nutrients produced during the day cannot be transported normally, and will accumulate in the leaves, causing the leaves to turn black and dark. There is also the use of foliar fertilizer or fungicidal drug hormones exceeding the standard, or the hormones contained in the fertilization show a hormone superposition effect on the leaves, resulting in premature aging of the upper leaves, and the leaves will also appear black and green. If the leaf color is too dark, there will be obstacles in nutrient transport, root growth, fruit expansion, overall plant growth, and fruit coloration.

Flowering and fruit setting also slow down, which directly affects the final yield. Second, at this time, the night temperature should be appropriately raised, adjusted to the range suitable for vegetables, and the control of Wang should be moderate, and the excessive use of drugs or fertilizers should not be used. Reduce the use of hormone drugs and fertilizers, timely use of biological enzymes with nitrogen to promote growth, can apply water-soluble fertilizers with high nitrogen macroelements to accelerate metabolism, metabolize harmful substances, and restore the normal growth of plants.

Planting requirements: We need to buy seeds with a high survival rate first, and then choose fertile, sunny organic fertilizer. Then prepare the land, dig a trench, sprinkle the vegetable seeds in, and cover it with a thin layer of soil.

In the process of its growth, it is necessary to do a good job in water and fertilizer management, and finally pay attention to weeding and preventing insects (pests).

I don't know what your dish is like, you should send a ** to come and take a look. How did the leaves suddenly turn black? Is it Suzhou Qingna?

When its leaves grow, they turn black, which is dark green. If not, isn't it? What kind of medicine was sprayed by someone else?

If you are infected with a bacterial disease, and in the case of high temperature and high humidity, the onset of the disease is relatively fast, so you can spray it with foliar fertilizer and fungicide to make the recovery faster.

The leaves of vegetables are blackened after top dressing, indicating that the fertilizer is applied too much, which may produce fertilizer damage, and should be flushed in the vegetable garden in time to reduce the impact of fertilizer damage.

Vegetables, especially leafy vegetables, should be applied with fertile leaf foliar fertilizer during the growth period to directly supplement the nutrients of the foliar surface and promote the better growth of vegetables.

After the vegetable top dressing, the leaves are blackened, too much fertilizer may be applied, and the fertilizer effect is too heavy, which has an impact on the growth of vegetables.

The yellowing of vegetable leaves is due to problems with the root system, such as low temperature, inhibition of water and fertilizer, and yellowing of leaves. In this case, the yellow leaves, no matter how much fertilizer is used, can not change the yellow leaves. Some are serious and yellow leaves, such as yellowing virus disease.

There is also a lack of nutrients and yellow leaves, a more common situation, to supplement fertilizer. In the case of a strong root system and few pests and diseases, the yellowing of the leaves should consider whether the fertilizer formula is appropriate. Physiological deficiency is also regular, the lower old leaves are yellow, generally lack a large number of elements, and the growers say that the upper leaves are yellow, which is the lack of medium and trace elements.

1. Some farmers are accustomed to water-soluble fertilizer when fertilizing, and only pay attention to the content of a large number of elements, that is, nitrogen, phosphorus and potassium can meet the growth of vegetables, but the types of medium and trace elements contained in water-soluble fertilizer are few, and there may only be two or three trace elements. If trace elements are used in fertilizer, but the acidity and alkalinity imbalance in the soil or substrate will also inhibit the absorption of trace elements by the roots.

2. There are also some farmers who supplement trace elements, and are accustomed to using foliar fertilizer spraying, using 30 grams of water for a bucket, in fact, this plays a very small role, and the leaves are still yellow. Some farmers are worried that the root application of trace elements will be low in utilization, so they use foliar sprays instead. This fertilization method is also not scientific, the roots can not absorb nutrients, the growth and development is poor, the later stage of premature aging, and the leaves absorb limited nutrients, can only alleviate the symptoms of nutrient deficiency, so, can not replace the root fertilization.

Yellow leaves due to lack of trace elements are not uncommon in the process of growing vegetables. The best solution is that farmers should take the initiative to supplement trace elements, and they are seven trace elements, so as to effectively prevent the occurrence of yellow leaves at the growth point.

When we use water-soluble fertilizer, add a little trace element fertilizer, which contains seven elements, and the nutrients are comprehensive, and it will not affect the growth of the root system. For example, ten kilograms of water-soluble fertilizer can be added with 100 grams of trace elements, which are added every time fertilizer is applied. However, it should be noted that when using a variety of trace elements, it is necessary to choose chelated fertilizers, which are stable in nature and prevent reactions with other fertilizers and affect fertilizer efficiency.

1. Improper watering.

Reason: Watercress grows in a humid environment, but once it is not watered properly or excessively, it will cause a large loss of water in the soil, because the roots are difficult to breathe, causing the roots to gradually rot. The temperature of the water is also a very important factor.

If the water used for watering is too cold, it will also cause the leaves of the plant to turn black, and the hail will appear black spots. Solution: Control the moisture and place the stagnant water in a well-ventilated area to encourage the excess water to evaporate as much as possible.

2. Improper fertilization.

Reason: Proper fertilization can promote the growth of watercress. If you apply too much fertilizer, or if you apply organic fertilizer that does not decompose, it can burn the root system and make it difficult for the plant to grow properly.

Solution: Daily fertilization must be done with well-rotted fertilizer. If the fertilizer is too thick, dilute it with proper watering.

Third, the temperature is too high.

Reason: Douban doesn't like hot weather, and high temperatures in summer are not good for growth. In the beginning, the level of light will cause dark spots, and later, in severe cases, it will directly cause decay.

Solution: Take measures to protect watercress from strong sunlight in summer. When the temperature is high, move to a ventilated and cool place.

Fourth, the temperature is low.

Reason: Not only because of the high temperature, but also because of the low temperature in winter. Solution: Be sure to move to a warm room in winter and keep the temperature above 10.

Summary. Pro, long black spots on the leaves of vegetables can be caused by a variety of reasons, such as diseases, insect pests, climate, and other factors. Here are some common ways to deal with dark spots:

1.Disease: For dark spots caused by disease, suitable fungicide can be used for spraying**, such as:

thiophanate-methyl, formabi, etc. At the same time, attention should be paid to the timely removal of infected leaves and pathogens. 2.

Pests: If the black spots are caused by insect infestations, suitable insecticides can be used for control, such as: fipronil, trichlorfon, etc.

But pay attention to the method of use and dosage so as not to have adverse effects on the plant. 3.Climate:

If the black spots are caused by climatic factors, such as high temperature and drought, flooding, etc., it is necessary to increase water and nutrients**, and water and fertilize the plants in time to improve the disease resistance of the plants. It should be noted that different causes and treatment methods of black spots are different, therefore, it is recommended to carry out targeted treatment according to the actual situation to ensure the growth and yield of the plant.

It's been planted for a few days, and spots appear, what's going on?

Pro, black spots on vegetable leaves may be caused by a variety of reasons, such as disease burial, insect pests, climate and other factors. The following are some common ways to deal with dark spots:1

Disease: For the black spots caused by the disease, you can use a suitable fungicide to spray Wuhe fog**, such as: thiophanate-methyl, Fumeshuang, etc.

At the same time, attention should be paid to the timely removal of infected leaves and pathogens. 2.Pest infestation:

If the dark spots are caused by insect infestations, suitable insecticides can be used to control them, such as fipronil, trichlorfon, etc. But pay attention to the method of use and dosage so as not to have adverse effects on the plant.

3.Climate: If the black spots are caused by climatic factors, such as high temperature and drought, flooding, etc., it is necessary to increase water and nutrients**, and water and fertilize the plants in time to improve the disease resistance of the plants.

It should be noted that different causes and treatment methods of black spots are different, therefore, it is recommended to carry out targeted treatment according to the actual situation to ensure the growth and yield of the plant.

It doesn't look like there's bugs.

It's a spot, will the vegetables die, is there any way.

How to deal with it. How to deal with small worms.

Dear, if you don't deal with the seedlings, you won't live. I see your sprouts outside. Dark spots on the leaves may be caused by a bacterial infection or a burn on the leaves.

If the injury is only burned, it can be helped by adjusting the light, avoiding direct exposure of the leaves to sunlight, and maintaining the right humidity. If it is a bacterial infection, the following measures can be taken:1

Cut off the infected area in time to minimize the chance of germs multiplying; 2.Maintain good ventilation and light conditions, avoid humidity and high temperature environments, and reduce the growth of germs; 3.Use a suitable Nai Heng He fungicide for spraying, pay attention to the method of use and dosage, and avoid causing damage to the plant.

【Cultivation Technique】

Most of them are planted in the ground, 3-5 meters high, and potted plants are 1-meter high. It does not choose much soil, and mixes humus soil with vegetable garden soil into loose and fertile slightly acidic to neutral sandy loam soil for planting and growth, light clay soil can also be, avoid heavy clay soil, saline-alkali soil. The potted pot should be large, and the pot should be low and a layer of foam plastic fragments should be padded to enhance ventilation and drainage.

During the growth period, it should be watered frequently, and the soil should be slightly moistened, but not waterlogged, otherwise the light leaves are yellow, and the heavy ones are rotten roots.

Begonia is fertilizable and barren, regardless of the potted plant, should be planted with some bone meal or rotten organic fertilizer as base fertilizer, before flowering, after flowering, when the leaves fall, each apply a nitrogen, phosphorus and potassium compound fertilizer, in order to facilitate flowering, fruiting, overwintering. Weeping silk begonia likes the sun, does not tolerate shade, no matter the ground potted plants should be placed in a sunny place, too shade will make the branches and leaves grow, less flowers or even no flowers to appreciate. It is slightly hardy and can safely overwinter in winter conditions with a minimum of -5 or so.

1.Trim properly. Prune diseased branches, dead branches and overly dense branches in time before germination in early spring; To renew the old branches of the old plants, the specific method is: sawing off the upper end of the large branches with few small branches, and then cutting off the weak branches after germinating new branches.

2.Pick the fruit in time. The young fruits should be removed in time after flowering, so as to save nutrients and increase the number of flowers in the coming year.

3.Watering and fertilizing. Spring drought is common in northern areas, so it needs to be watered 2-3 times in early spring; Every autumn, a trench is dug and a well-rotted organic fertilizer is applied.

4.Pest and disease control. Always pay attention to observation and timely control of pests and diseases.

Is this it? Lettuce leaf margin necrosis disease.

It is also known as bacterial spot disease and root rot. Mainly damage the leaves, mostly from the time of balling, the leaf edge or near the leaf edge first disease, at first water-immersed, then dry and paper-like, now brown to black-brown irregular oil-soaked lesions, the leaf edge lesions are about centimeters wide, the other parts of the leaves are reddish-brown spots, some several lesions are continuous, gradually softening, some of the whole plant quickly dry up or fall leaves, generally only the bulb leaves are diseased, and the expansion is slow, the disease affects the development, but does not cause rot. Some have black to green hard rot tissue in the center of the stem, which extends to the root along the veins of the bottom leaf when the plant is weakened, causing root rot.

Mode of transmission and cause.

Pathogenic bacteria overwinter in the soil and spread through the soil or air. It is easy to develop the disease under the conditions of low temperature and high humidity, and the disease is generally severe in early spring and late autumn, and cold and fog are conducive to the disease. Onset is rare and slow during high summer temperatures.

Prevention and control methods. (1) Crop rotation with other vegetables.

2) Strengthen field management, adopt formula fertilization technology, avoid high soil humidity conditions, implement furrow cropping or high ridge cultivation, and use plastic film to cover to avoid reducing the contact between diseased plants and healthy plants.

3) 1 month after sowing, spray 1000 times of 47% Garinon wettable powder or 400 times of 30% green debao suspension, 500 times of 50% copper succinate wettable powder, 300 times of 14% copper ammonia aqueous solution, 500 times of 77% killable wettable particle powder, spray 50 liters of good liquid per 667 square meters, once every 10 days, and control 2 3 times. Discontinue the drug 3 days before harvest.