What causes the yellow and curly bean leaves?

The main reason is that there are certain diseases, and then there are that kinds of pests and diseases, in which case they will form this special kind of leaves, so it makes people feel very scary.

This is a typical long-grown carob with potassium deficiency caused by yellowing of leaves. Potassium deficiency causes yellowing of leaves, and the yellow spots that appear are mainly concentrated near the leaf veins, and the edges of the leaves have symptoms of drooping. One of the main reasons for potassium deficiency is the low use of organic fertilizers.

Now is the time to reduce the use of nitrogen fertilizers and promote potassium uptake.

The plant is infected with root rot, which causes poor growth and gradual yellowing of the bottom leaves; Deficiency of trace elements, such as iron and zinc; Poor root growth, insufficient fertilizer and water, etc.

It may be a lack of nutrients, because if there is no nutrition, it will turn yellow, so it is a lack of nutrients.

Beans are a vegetable that we often eat and can be stewed and eaten; It can also be blanched and then served cold; The best way to eat it is to blanch it, dry it in the sun, and stew it with pork belly. Cultivation is very common due to eating a lot. In planting, it is common to see the leaf tips of beans curled and wilted, which is caused by a variety of reasons.

First, the normal curl and wilting. In the normal growth of beans, due to vigorous growth, sudden changes in weather, cold and heat, will cause curl and wilting. But this is a temporary phenomenon, and it will automatically stretch and grow normally when the weather is normal.

Second, water and fertilizer are insufficient. During the growth process, nutrients are transported from the leaf stem to the leaves, due to the lack of fertilizer or water, resulting in malnutrition, and the leaf tips cannot absorb nutrients, resulting in curling and wilting. At this time, it is necessary to water and fertilize in time.

Third, land compaction. After watering, the soil is compacted and has no permeability, so that the root system can not "breathe", can not absorb nutrients from the outside world, and can not transmit the absorbed organic fertilizer elements to the stems and leaves, and the sunlight absorbed by the leaves cannot be transmitted, resulting in "blood circulation" (water veins are not connected). As a result, the leaves are "false si", curled and wilted.

Therefore, after watering the carob field with a little water, it is necessary to hoe in time to let the root system of the carob grow comfortably.

Fourth, the concentration of spraying pesticides is higher. After the occurrence of insect pests in beans, it is inevitable to use some pesticides for control. Due to the heart of insect control, the concentration of the proportion is increased privately when mixing pesticides, and the leaf tips and leaf edges are more tender, forming temporary "pesticide damage", resulting in curling and wilting.

Therefore, even if the low-toxicity pesticides are used, they should be blended according to the standard ratio.

Fifth, caused by pests and diseases. In the process of growth, whether it is roots, stems, or leaves, beans are exposed to various pests and diseases. For example, virus diseases, wilt and a variety of insect pests will cause wilting of the leaf tips and edges of the beans.

Sixth, lack of sunlight. Beans are temperature-loving vegetables, planted next to high-stem crops, or planted too densely, blocking the warmth of beans to absorb sunlight, impermeable to wind, easy to curl, and wilting. Therefore, when planting beans, it is necessary to choose a good plot, do not plant next to large trees or near tall crops, and plant reasonably densely.

In short, there are many reasons for the curling and wilting of the leaf tip of the bean leaf. In addition to human factors, crop rotation planting is the best way to solve curling and wilting.

It is not that there is a pest, but that a disease has occurred, and it is best to use carbendazim solution to sanitize, spray 2 or 3 times.

1. It may be carob root rot. The disease mainly affects the roots and base of the stem, which invades from wounds. The disease is severe when there is high temperature and rain, water accumulation in the field, and high humidity.

At the beginning of the disease, water-stained reddish-brown spots appear on the diseased area, which later turn dark brown or black-brown, slightly depressed or cracked; The taproot is rotten or necrotic, the lateral roots are scarce, the plant is dwarfed, and it is easy to pull out. In severe cases, all the taproots rot and the stems and leaves die.

The reason for the yellowing and curling of carob leaves may be: the harm of aphids, its adults are mainly concentrated on young leaves and young stems, and will suck the sap in the leaves, causing the leaves to look yellow and curly, affecting photosynthesis and producing nutrients, so the plants look generally short.

There are two main types of symptoms: the yellow leaves of beans. One is that the leaves at the bottom are yellow, easy to fall off, and gradually swell upward, causing dead trees. The second is the yellowing of the new leaves at the top, which is often accompanied by falling flowers and fruits.

The third is that the plant does not die, but the middle of the vein of the plant leaf is yellow. Cause analysis of bean root rot, commonly known as "red root disease". This is a soil-borne disease, the early pathogen infects the root system, the plant is malnourished, the bottom leaves are yellow, the plant wilts, recovers, and causes dead trees.

Trace element deficiency. The yellowish-white appearance of the leaves at the top of the growth point is caused by iron and zinc deficiency. The yellowing of the new leaves at the top usually occurs when the new leaves turn clear suddenly after dark, the root system does not grow well, the weather changes from cold to warm, and the early plants produce too much fruit.

Poor plant growth. This condition does not cause plant death, mainly because the plant grows poorly, resulting in yellowing in the middle of the middle and lower leaves, which can easily lead to premature plant aging. For example, the temperature in the shed is too high, the root system is underdeveloped, the root system is damaged, and the fertilizer and water are not scientific, etc., will cause a similar situation.

The first is an infectious pathogen, mainly soil-borne root rot.

It invades growing roots at an early stage, resulting in poor plant growth, malnutrition of the outer leaves, and yellowing of the bottom leaves. What to do if the beans turn yellow? Find the right reason and prescribe the right medicine!

Doubling the yield of root rot of beans can be controlled by chemical control, and the soil should be thoroughly disinfected and sterilized during planting to remove the germs from the roots. In the onset stage, carbendazim can be used for root irrigation with good effect. The second is due to a deficiency of trace elements, which causes yellowing of the leaves at the top growth point, mainly due to the deficiency of iron and zinc.

The yellowing of the new leaves at the top is caused by a sudden sunny day after rain and warm and cold weather.

For beans lacking trace elements, organic fertilizer can be applied in time to improve the organic matter in the soil, provide trace elements for the growth of beans, supplement the nutrients required by beans through foliar spraying, and alleviate the yellowing of leaves. The third problem is poor plant growth, which does not cause the death of the whole tree, but the leaf veins will turn yellow, causing premature plant senescence, which is a rare phenomenon. It is mainly caused by high temperature in the shed, insufficient fertilizer and water, and root damage.

If the leaf veins are yellow, it is necessary to water and fertilize them in time and reasonably to improve the immunity of beans, enhance plant resistance, promote the rapid growth of the root system, and avoid premature yellowing of leaves.

Trace element deficiency. The leaves at the top growth point appear yellowish-white, which is caused by iron and zinc deficiency. The yellowing of the new leaves at the top generally occurs when the new leaves are sunny after the shade, the root growth is poor, the weather changes from cold to warm, and the early plant bears too much fruit.

It is likely that these leaves do not receive enough light, so the leaves are yellow and weak.

1. The reason for the poor variety; 2. The soil is compacted and poor, and the organic matter content is low; 3. The climate is arid and water-scarce; 4. Insufficient light is not conducive to photosynthesis to produce nutrients; 5. Pests and diseases have not been prevented and controlled in time.

There are three reasons for the yellowing of leaves: the veins are green and the leaves are yellow and magnesium is deficient. The old leaves are green. The new leaves are yellow and iron deficient. Nicotine is heavier and will turn the foliage yellow.

The cause of the yellowing of the bean leaves is likely to be caused by improper watering, such as drought or overwatering causing water accumulation, which will damage the normal growth of its root system, which will cause its leaves to turn yellow. It is also possible that when fertilizing, the concentration of fertilizer is relatively high, it will burn the roots, and the roots will also cause yellow leaves after being burned, so it is necessary to master the scientific fertilization method and avoid applying thick fertilizer.

Beans are more afraid of salt and alkali and are prone to yellow leaves. Therefore, the alkalinity should be neutralized, and it can be diluted with ferrous sulfate and poured into the root system. In addition, if it is dense, ventilation is not good, it can also lead to yellow leaves.

The old leaves have spots and slowly turn yellow and fall off the leaves, and what medicine is used to prevent them is effective.

Summary. Answer: There are many reasons for the yellowing of carob leaves: 1. Infection and disease, 2. High temperature, 3. Lack of trace elements, 4. Lack of oxygen in the root system. The following will specifically introduce several causes of yellowing of carob leaves and prevention and control methods.

1. Infection with diseases.

Carob seedlings are infected with root rot, commonly known as "red root disease". The fungus infects the root system in the early stage, resulting in malnutrition of the plant, and the bottom leaves gradually turn yellow, easy to fall off, gradually expand upward, and finally lead to the death of the tree. At this time, it is necessary to take the medicine to irrigate the roots, and you can choose the medicine:

Carbendazim. Formeidi (allicin) + oxafen + copper pine acid root irrigation.

2. The temperature is too high.

Beans like to be cool, and when the temperature is above 30 degrees Celsius, the leaves will start to turn yellow. It needs to be shaded with a shade net, and spray water mist around the beans once a day in the morning, noon and evening.

What is the reason for the yellowing of the edges of the bean leaves.

Hello, happy to answer your questions.

Answer: There are many reasons for the yellowing of carob leaves: 1. Burning and infecting diseases, 2. High temperature, 3. Lack of trace elements, 4. Lack of oxygen in the root system.

The following will specifically introduce several causes of yellowing of carob leaves and prevention and control methods. 1. Infected with diseased carob seedlings infected with root rot, commonly known as "red root disease". The pathogen invades the root system in the early stage, resulting in malnutrition of the plant, and the bottom leaves gradually turn yellow, easy to fall off, gradually expand upward, and finally lead to the death of the tree.

At this time, you need to pick and take the medicine to irrigate the roots, and you can choose the medicine: carbendazim. Formeidi (allicin) + oxafen + copper pine acid root irrigation.

2. When the temperature is too high, the beans like to be cool, and when the temperature is higher than 30 degrees Celsius, the leaves will begin to turn yellow. It needs to be shaded with a shade net, and spray water mist around the beans once a day in the morning, noon and evening.