What causes pepper leaves to turn yellow and fall?

One is poor nutrition of chili peppers. Is the base fertilizer applied when preparing the land before planting? If no plantar fertilizer is applied, the leaves may turn yellow and fall due to malnutrition, or there is no top dressing during the flowering and fruiting period of the pepper, because the pepper is also to be topdressed in stages to supplement nutrients, and the leaves of the pepper are yellow and fall due to insufficient nutrients.

The second is improper field management. In addition to proper fertilization, it is also necessary to pay attention to watering.

And hoeing, if the soil moisture is poor due to drought and little rain, the leaves of the pepper will also turn yellow and fall because of the lack of moisture, or due to more rain, the pepper field is wet for a long time, or the water is accumulated, and the temperature is relatively high, it is also easy to fall leaves.

The third is the harm of pests and diseases. Especially in the later stage of the virus disease, it will also cause leaf loss, flower and fruit drop, if it is more serious, it will lead to pepper, the whole dwarf leaves are few and small, and even die. There is also leaf blight that occurs in the high temperature and high humidity season, if it is more serious, it will also cause a large number of pepper leaves to fall, seriously affecting the yield of pepper.

Of course, if the pepper leaves turn yellow and fall, there is also a possibility that the pepper is ripe to the harvest stage, so it is normal for the leaves to turn yellow and fall. Only by going deep into the pepper field, conducting careful analysis on the spot, and figuring out the specific reasons for the yellowing and falling of pepper leaves, can we prescribe the right medicine to solve the problem.

The first is to choose a good variety. It is necessary to pay attention to the selection of disease-resistant, high-quality pepper varieties for planting. Before sowing seedlings, combined with germination, the seeds are soaked in water for about 12 hours, and then soaked for a few minutes with 1% copper sulfate solution for disinfection.

The second is to apply plantar fertilizer. Before planting peppers, the ground should be deeply ploughed. It is necessary to apply well-rotted farmhouse fertilizer or organic fertilizer, as well as ternary compound fertilizer as the base fertilizer, and then carry out deep turning to fully mix the fertilizer with the soil, and then use the rotary tiller rotary tillage to level, ridge and mulching ready for planting.

The third is reasonable dense planting. When planting peppers, according to the characteristics of the variety, pay attention not to plant too high density, so as to prevent the ventilation and light transmission in the field from affecting the growth of peppers. Then it is necessary to pay attention to the demand for nutrients for the growth of peppers, timely topdressing and watering, to ensure the needs of nutrients for the growth of peppers, and to maintain a balanced and unified soil moisture in the field, drought watering and waterlogging.

Fourth, pest control. After the pepper is planted, it is necessary to pay attention to field management, in addition to fertilizing and watering and cultivating and hoeing, we should also pay attention to the prevention and control of pests and diseases, and we must prevent and treat them early. In the early stage of pepper disease, you can use 50% carbendazim 500 times solution, or 80% anthrax Fumei wettable powder 800 times solution for foliar spray, don't wait until the pepper leaves turn yellow and fall off to panic, at this time it is a little too late.

It may be that the pepper leaves lack some nutrients, so you can give the pepper more organic fertilizer, and you should also water the pepper leaf more, so that its leaves will not turn yellow.

Because of the lack of nutrients, the pepper tree does not get enough nutrients, so its leaves turn yellow and fall off.

It may be caused by a lack of water, and it is recommended to observe after watering.

If it lacks nutrients or lacks water, it should be fertilized and suitable for him, such as compound fertilizer, which can supplement the nutrients it needs and make it grow better.

There are four reasons for this.

1. Yellow leaves caused by high temperature and drought.

Affected by high temperature and drought, pepper seedlings will have the problem of lower yellow leaves due to insufficient absorption of water and fertilizer in the root system and malnutrition, which can be delayed by spraying foliar fertilizer or timely watering. In addition, the high temperature in summer will also cause the adult pepper to turn yellow leaves, which is also easier to judge: the pepper leaves curl upward, and the veins of the leaves turn green and yellow spots appear, gradually leading to the yellowing of the whole leaf.

2. Yellow leaves caused by nutrient deficiencies.

Pepper nitrogen deficiency will cause the plant to be thin and low, the leaves are thin and yellow, and it will fall off in the later stage, you can apply an appropriate amount of nitrogen fertilizer or compound fertilizer, but not too much fertilizer, so as not to cause the plant to grow.

Magnesium deficiency in pepper often occurs at the fruiting stage, and the leaves will yellowish along the main vein and gradually expand to the whole leaf, but the main vein and lateral veins will maintain clear green, and the old magnesium deficiency leaves will turn pale yellow between the veins.

When peppers are deficient in potassium, the leaves will lose green and turn yellow from the leaf margin, and the tips near the middle of the plant will gradually turn yellow-green. Lack of calcium in peppers causes the plant to be dwarfed and the top leaves to yellow, but the lower leaves remain green, and the growing point and its vicinity will stop growing or die, and the lower part of the fruit tree will turn brown and rot.

3. Yellow leaves caused by fertilizer damage and pesticide damage.

Pesticide damage to yellow leaves: After the occurrence of pesticide damage in pepper, the leaves will be scorched and the leaf edge will yellow, but the yellow leaves caused by pesticide damage will mostly occur in spots and will not expand on the leaves.

Fertilizer damage to yellow leaves: After the fertilizer damage of pepper, the leaves will turn yellow, shrunk, brittle and ossified.

Fourth, the yellow leaves caused by the disease.

Pepper wilt wilt mostly occurs in the middle and late stages, the leaves near the ground will droop at the beginning of the disease, and then the leaf tips will gradually become dry yellow, and spread upward along the main stem, and finally make the whole pepper all wilt and die, which should be used in time fungicide**.

Causes of yellowing of pepper leaves and prevention methods.

1.Viral diseases.

In the case of high temperature and drought, especially some time ago, the occurrence of virus disease is particularly serious, the specific symptoms are the appearance of bright veins on the top of the leaves slightly green, or the appearance of thick and light green mottling, severe in addition to the green mottling, will also cause the diseased leaves to turn obvious yellow, the phenomenon of falling leaves, especially in the case of high temperature and drought.

Prevention and control measures. In the prevention and control of viral diseases, we must first control whiteflies and aphids, because whiteflies and aphids will spread viral diseases, causing difficulties in prevention and control. For viral diseases, virus A plus triasanol can be used for prevention and control.

2.Leaf mold.

It usually starts in the lower leaves and gradually develops to the upper leaves, especially during the swelling period of the fruit. At the beginning of the disease, it has light yellow irregular green spots, and the diseased part of the leaf is initially white mold, and soon turns gray-brown to black.

With the development of the disease, the leaves gradually become spotted from the bottom up, and when it is serious, it becomes yellow and dry, so that the plant grows weak, and the fruit becomes smaller and deformed, which affects the yield.

Prevention and control measures. After the onset of the disease, it can be sprayed with a mixture of Dakonine 700-800 times, mycloconazole 2000 times, and methyl tobuzine 800 times. It is also necessary to pay attention to the timely removal of diseased residues after harvest, and concentrate on deep burial or burning, and reasonable crop rotation, preferably rotation with non-Solanaceae plants, which can reduce the probability of leaf mold.

It should be a lack of fertilizer or water, it depends on what the potting soil lacks nitrogen, the leaves are small, the leaf color is light yellow, the lower leaves are yellow first, and gradually the whole plant loses its green, and the lower part is more yellow.

The potting soil is deficient in phosphorus, the leaves are curled, the leaf color is dark green, the yellowing between the leaf veins of the lower leaves is potassium deficiency, and the brown edges of the lower leaves are easy to lodging.

The potting soil is deficient in magnesium, and the edge and middle of the leaves are green and white from bottom to top.

If there is no lack of fertilizer, it may be that there is too much watering or too much fertilizer.

Mosaic disease plus yellowing virus disease can be cured three times with a plant-derived biological pesticide 30% suspension agent willow. The effect is immediate.

The roots are weak and the absorption capacity is poor, and they cannot absorb enough nutrients for the growth of aboveground stems and leaves, resulting in poor plant growth. Nitrogen, phosphorus and potassium (20, 20, 20) water-soluble fertilizer plus humic acid active liquid fertilizer or amino acid active liquid fertilizer plus biological bacterial fertilizer were applied to the roots. Foliar sprays of natural brassinin plus humic acid active liquid fertilizer plus potassium dihydrogen phosphate plus zinc sulfate plus magnesium sulfate plus ferrous sulfate.

Every 7 to 10 days, 2 to 3 times in a row. In order to promote the roots to take root and strengthen the roots, promote the seedlings to grow seedlings and strengthen the seedlings.

Answer pro, there are many reasons for the yellowing of pepper leaves, the following is the prevention and control method I have sorted out for you about the causes of yellowing of pepper leaves, you can take a look at what is the main cause of yourself! 1.The yellow leaves caused by overwatering improved and the peppers entered the normal growth stage.

In order to promote the tree, some vegetable farmers water too much at one time, resulting in a lack of oxygen in the soil, the death or injury of capillary roots, which makes the water and nutrients insufficient, resulting in the young leaves at the top of the pepper are light yellow and wilted, and the old leaves are dark yellow. In addition, excessive watering leads to insufficient iron and zinc**, or lack of iron and zinc in the soil, which can also lead to yellowing of the parietal leaves. Prevention and control methods:

Watering should be carried out according to the needs of peppers in different growth periods and soil moisture, and the requirement is to water small water, not large flooding. After the yellow leaves appear due to excessive watering, hoe in time to reduce soil moisture, and spray leaf fertilizer containing iron and zinc in time to solve the problem. 2.

The yellow leaves caused by the excessive soil are affected by the continuous rainy and snowy weather, and the peppers planted early cannot be watered in time due to the low temperature in the early stage, resulting in the lower old leaves gradually drying up and curling yellow. Solution: After the weather improves, water in time to ensure the moisture required for the growth of peppers, but the watering should not be too large, otherwise the capillary root injury will cause the new leaves to turn yellow.

3) Yellow leaves caused by excessive fertilization are normal old leaves are hypertrophied and shiny, the leaf color is dark green, the back of the leaves is shrunken and convex after a large amount of fertilization, the leaves are not stretched, the old leaves gradually fall off, the new leaves are seriously curled and closed, and the whole leaves turn yellow and fall off. The reason for this is that the amount of fertilizer applied is too large. Workaround:

Timely watering to dilute the fertilizer concentration, combined with irrigation rooting agent, and spraying Brassidiolactone or Bihu at the same time, can alleviate fertilizer damage.

Parietal yellowing is mostly a viral disease, and the lower yellowing is considered to be a bacterial disease or nitrogen deficiency.

1. Excessive watering: Flood irrigation will cause the young leaves at the top of the pepper to turn yellow and wilt. 2. Excessive fertilization:

Excessive soil fertility causes root burns and leaves turn yellow and fall off. 3. Infection disease: After being attacked by viral diseases, the leaves will gradually wither and fall off.

4. Strong light exposure: especially in the hot summer, the leaf tip is seriously yellowed.

1. Watering too much

In the process of cultivating peppers, flood irrigation and excessive watering at one time will cause hypoxia in the soil and damage to the capillary roots, causing the young leaves at the top of the pepper to turn yellow and wilt, and the old leaves to appear dark yellow, so when watering the peppers, we must master the amount of water.

2. Excessive fertilization:

After applying thick fertilizer to pepper, the soil fertility will be too large, resulting in root burns, and the leaves will shrink and bulge, yellow and fall off.

3. Infection with diseases

After pepper infection with viral disease, the leaves will also yellow and fall off, the leaf surface will be uneven and slightly yellowish in the early stage of the disease, and the yellowing degree will deepen after 1-2 months, at this time, the diseased leaves should be cut off, and then the pepper should be sprayed with anticides.

4. Strong light irradiation

Although pepper is a light-loving crop, but long-term under the scorching sun, the branches and leaves are easy to wither yellow, especially in the hot summer, the phenomenon of yellow leaves is very common, in this case, you can pull a layer of shade net on the upper part of the pepper.

Summary. The yellowing of pepper leaves may be caused by diseases such as viral diseases and leaf mold. When the pepper suffers from viral disease, the leaves on the top of the plant will fade green, or there will be mottled between dark green and light green, and if the situation is more serious, the leaves will turn yellow and fall; In the case of leaf mold, the leaves will appear light yellow and irregular greened spots, and mold will appear on the back, and the leaves will turn yellow and dry up after a period of time.

The yellowing of pepper leaves may be caused by diseases such as viral diseases and leaf mold. When the pepper suffers from viral disease, the leaves on the top of the plant will fade green, or there will be mottled between dark green and light green, and if the situation is more serious, the leaves will turn yellow and fall; In the case of leaf mold, the leaves will appear light yellow and irregular greened spots, and mold will appear on the back, and the leaves will turn yellow and dry up after a period of time.

1. Suffering from viral diseases: in the case of high temperature and drought (especially in the first period of time when high temperatures) are more likely to occur, the specific symptoms of plant disease are that there will be bright veins (slight greening) on the leaves at the top, or there will be dark green, light green mottled, if the disease is more serious, in addition to having greening, mottled and other symptoms, it will also make the diseased leaves obviously yellow, and there will be the phenomenon of falling leaves. 2. Suffering from leaf mold disease:

Generally, the disease starts from the lower leaves, and then gradually develops to the upper leaves (especially the fruit expansion period will be more serious), the initial stage of the disease will appear light yellow and irregular greenish spots, and at the same time, the diseased part of the back of the leaf will appear white mold layer, and soon its color will become gray-brown to black, with the development of the disease, the leaves will turn yellow and dry, and in severe cases, it will affect the yield of peppers. <>

<> how to deal with the yellowing of pepper leaves 1, first use drugs such as lice and green cabbage to control whiteflies and aphids, because these two pests will spread viral diseases, thus causing difficulties in prevention and control, if the plant is already diseased, you can use drugs such as virus A + triacosanol to prevent and control. 2. Mixed spraying with Dakonine (700-800 times liquid), mycloconazole (2000 times liquid), methyl tobuzine (800 times liquid) and other drugs, and at the same time, it is necessary to pay attention to the need to remove the disease residues in the field in time after harvesting, and to concentrate on deep burial or burning, in addition to reasonable crop rotation (rotation with non-solanaceae crops) to reduce the probability of leaf mold. <>