What are the causes of yellowing of spinach leaves, and how should I treat them?

1. The reason for the yellowing of spinach leaves.

1. Self-growth: If it is a new root that grows at the bottom of the axils of the leaves, causing the spinach leaves to turn yellow, this is a very long imagination, in terms of biology, it is metabolism, and there is no need to worry about this situation.

2. Planting soil: If the spinach leaves do not regrow new roots from the bottom of the leaf axils and cause yellowing, it is mostly because the soil quality is not good, poor air permeability, etc., resulting in poor growth of spinach and yellow leaves, at this time, the land should be renovated to increase the air permeability of the soil layer.

3: Fertilization problem: When spinach is planted, a large amount of nitrogen, phosphorus and potassium fertilizer elements are needed, and the ratio of nitrogen, phosphorus and potassium elements is 2:

1:3, but you can't only apply these three kinds of fertilizer, or you can apply some iron, zinc, manganese and boron microelements to the soil, because if these are indeed affected by the yellowing of spinach leaves, you can also spray some foliar fertilizer on spinach in the later stage to increase nutrients and prevent the leaves from turning yellow.

4. Watering: In the process of spinach planting, if the amount of watering is too large, it will make the spinach roots grow poorly due to lack of oxygen and the leaves will turn yellow, at this time, you can insert a chopstick into the soil when watering, to see if the roots of spinach are lacking water, if the soil is in a moist state, there is no need to water.

2. Prevention and control measures for yellowing of spinach leaves.

1. Agricultural measures: choose those disease-free seeds when planting, and hang some silver ash film in the field to drive away aphids. It is necessary to keep the surface of the land clean and eradicate diseased plants and weeds in time.

When planting, choose well-ventilated terrain and water spinach in dry seasons, which can reduce the yellowing of spinach leaves. Fertilization can be carried out, and phosphorus and potassium fertilizers can be added, which can improve the disease resistance of spinach and make spinach grow healthily.

2. Pesticide control: In the early stage of leaf yellowing, you can spray some plant disease emulsion, or spray some anti-poison agents. For downy mildew and anthracnose of spinach, in the initial stage, it can be treated with 75% chlorothalonil 600 times solution, 25% methalonil 700 times solution, 40% ethyl phosphorus aluminum wettable powder 300 times solution, etc.

One flush some organic fertilizer, the other is a foliar fertilizer that supplements these trace elements, and it is better to contain potassium, zinc, iron, calcium and nitrogen.

The reason for the yellowing of spinach leaves is that there is a lack of water and drought, the soil is not loose in time, the leaves are pests and diseases, and the spinach leaves lack the corresponding nutrients.

The reason is that there is a lack of water and the ultraviolet rays are too strong, so the leaves are yellow, so you should water more and then use chemical fertilizers, so that you can prescribe the right medicine.

It may be because of the lack of nutrients, water this plant more fertilizer, water more, and pay attention to insecticide, so that it can be alleviated.

If new roots grow from the axils of the bottom leaves of spinach, then it is normal for the leaves to turn yellow, which is the metabolism of spinach itself.

The yellowing of spinach leaves is caused by a lack of fertilizer, if you find that the leaves are yellow, we can, dilute some foliar fertilizer, and spray it on it.

Spinach is a common vegetable in autumn and winter, and it is popular in the market because of its refreshing taste and rich nutrition. At present, spinach is also very common in China, and it can be grown in greenhouses or outdoors. But no matter which way you go, there are all sorts of problems you will encounter in the management process, what about the yellow spots on spinach leaves?

How can it be prevented? Let's learn about it.

What's the deal with yellow spots on spinach leaves?

This could be downy mildew.

Downy mildew mainly affects spinach leaves, and the lesions are yellowish in the early stage, irregular in shape, and inconspicuous in edge. After the lesion, they connect to each other as a piece, which then turns into brown spots and can lead to death. A layer of grayish-white mildew will form on the back of the leaves, which will then turn grayish-purple.

Diseased leaves turn yellow when dry, and rot when humidity is high; In severe cases, the whole leaf turns yellow and dies.

The cause of spinach downy mildew is mainly related to low temperature and high humidity conditions. Once late blight appears, bacteria are also infected, and infected plants tend to shrivel and spread through air currents, rain, agriculture, insects, etc. At an air temperature of 10, relative humidity.

85% of the occurrence of low temperature and high humidity conditions, or excessive planting density, water accumulation, and early sowing, will lead to serious disease.

Spinach downy mildew control methods.

1. Variety selection.

Choose downy mildew-resistant varieties for cultivation, such as Outlander.

Royal Black Generals, etc.

2. Implement crop rotation.

Implement 2-3 years of crop rotation, the planting density is reasonable, reduce the field humidity, and the density should not be too high.

3. Strengthen management.

Before sowing, the residues and dead leaves should be removed in time, the soil should be finely trimmed, and the appropriate organic fertilizer should be applied to improve the disease resistance of the plant. At the same time, it is necessary to pay attention to the control of water and fertilizer, especially not to overwater, which will increase the humidity of the field and promote its disease.

4. Chemical control.

Once a small area of diseased plants is found, spray 500 times the solution of 53% manganese zinc water dispersible granules in time, spray 2-3 times in a row, and use each agent alternately to prevent drug resistance.

Generally speaking, if you find that there are yellowish spots on the leaves when planting spinach, you can judge whether it is caused by downy mildew based on the above experience, find out the cause of the disease, and then take corresponding control measures.

It may be the result of downy mildew. Downy mildew mainly affects spinach leaves, and the lesions are pale yellow, irregularly shaped, and the edges are not obvious. After the lesions expand, they are connected to each other into patches, and later they turn brown and die.

A gray-white mold layer is produced on the lesions on the dorsal leaf lesions, which later turn grayish-purple. In drought, the diseased leaves wither yellow, rot more when the humidity is high, and the whole leaves of the serious plant turn yellow and die.

Control method: variety selection: choose varieties resistant to downy mildew for cultivation, such as using the Royal Black General of Outlander, the Royal Black Qiang of Saint-Nice, Syngenta Dadiwo, etc., and the sharp-leaved varieties can also be used.

Implement crop rotation: 2-3 years of crop rotation should be implemented, reasonable dense planting, reduce field humidity, and the density should not be too large.

Strengthen management: Before sowing, the residual plants should be completely removed in time, the land should be carefully prepared, and the fully decomposed organic fertilizer should be applied to improve the disease resistance of the plants. At the same time, pay attention to the control of water and fertilizer, especially do not water too much, too much water will increase the humidity of the field and promote its disease.

The yellowish spot of spinach is caused by malnutrition, and if you want to prevent this disease, you should breed excellent varieties, apply proper fertilizer, and water properly.

Because the spinach has bugs. Around the spinach, spray some pesticides and spray pesticides on time according to the growth of the spinach, and that's it.

It may be caused by some diseases, or it may be caused by the wrong way of planting, it may be caused by some pests and diseases, it may be caused by too long exposure to sunlight, or it may be caused by poor development. Some fertilizers can be used when planting, and some pesticides can also be used.

It may be caused by a lack of water, so be sure to water frequently, clean up the stagnant water, and then prevent insect infestations and loosen the soil in time.

This can be caused by malnutrition or root rot, and it can be fertilized or drained.

Kissing hello may be self-growing. If new roots regrow at the bottom of the leaf axils, causing the spinach leaves to turn yellow, which is a normal metabolism, you don't have to worry about this situation. Planting soil.

If the spinach leaves do not regrow new roots from the bottom of the leaf axils and cause yellowing, it is most likely because the soil quality is not good, poor air permeability, etc., resulting in poor growth of spinach and yellow leaves, at this time, the land should be renovated to increase the air permeability of the soil layer. Fertilization issues. When spinach is grown, it needs a large amount of nitrogen, phosphorus and potassium fertilizers, and the ratio of nitrogen, phosphorus and potassium elements is 2:

1:3, but not all of these three fertilizers can not be applied, or some iron, zinc, manganese and boron microelements can be applied to the soil.