Why do citrus autumn shoots yellow? How to deal with citrus yellowing?

In recent years, the yellowing of citrus fruits in autumn is very common, what are the reasons for this, and what measures should be taken to deal with it? I will analyze the causes of this disease and make several suggestions and measures:

1. Caused by lack of soil fertilizer.

If the soil is sandy, the viscosity is not enough, the fertilizer holding capacity is low, and it is easy to lose fertilizer, resulting in insufficient nutrients in the root system. Citrus fruits generally prefer acidic, moderately clay soils, and soils that are too sticky will not work.

Solution: Improve the soil before planting, and water from the roots in time. You can choose Yuhualing No. 1, which can quickly promote the absorption of nutrients by the root system.

2.Spreading pests and diseases, causing the roots and leaves to turn yellow.

The initial root damage infestation is mainly from diseased roots and root-knot nematodes in the soil, which are partly due to fertilization processes and other human factors. They are suitable for growing in loose, breathable, and viscous soils. Root-knot nematodes invade the roots of citrus fruits, which will cause tumors in the roots of citrus fruits, affecting the absorption and transportation of nutrients by the roots, and the leaves will turn yellow or become diseased due to insufficient nutrients.

Solution: Choose disease-free seedlings for planting, soak the roots in warm water at 50 degrees Celsius before planting, and then soak the roots with Yuhualing No. 1 to promote root development. It is possible to choose to plant rice on the ground so that there are no root-knot nematodes in the first place.

3.Citrus psyllids can spread toxins that cause the leaves to harden and turn yellow.

Failure to pay attention to the control of citrus diseases and pests in the early stage of crop management will lead to hardening and yellowing of leaves. It is green, the mesophyll turns yellow, shows signs of aging, and slowly becomes deficient in iron, manganese, and zinc.

Countermeasures: Take precautions in advance, and do a good job of spraying in the peak growing season, especially in summer, to avoid insect pests. To promote the maturity and robustness of citrus plant branches and improve disease resistance, fungicides can be mixed with Yuhualing No. 2 in summer to prevent and control vigorous branches.

4. Seedling transplanting is poisonous, resulting in yellowing in the later stage. Many initial infections** are spread from seedlings carrying the germ and then to other plants after being bitten by insects.

Solution: Select virus-free seedlings and use non-virulent vaccines for propagation. It is advisable to purchase seedlings from large nurseries that specialize in cultivation, or to raise seedlings using micro-grafted citrus buds.

This situation is caused by too much fertilization, and this situation can be alleviated by watering more water and diluting the fertilizer.

This is due to the unsuitable temperature and climate, if this happens, the temperature should be controlled, and the temperature should be controlled at about 23.

Because in autumn, the nutrient supply is insufficient, and the water and light will become less, so the autumn shoots will yellow, and the nutrition should be strengthened, and more watering can cope with the yellowing of citrus.

Hello! There can be four reasons for yellowing of citrus:

1. The root system is hardened and rotted due to excessive fertilization;

2. Root-knot nematodes damage the root system, causing the root system to be unable to breathe and absorb nutrients normally and the yellow leaves that grow poorly;

3. Leaf yellowing caused by the wrong circumcision method.

4. The yellowing of fruit trees caused by improper application of organic fertilizer and compound fertilizer is not right.

You can suggest the following methods**:

Yellowing of leaves caused by improper foliar spraying: Haoda 1200 times - 1600 singles to alleviate pesticide damage and root rot caused by yellow trees: specific reasons for specific customization of ** scheme due to chicken and cow dung Yellow trees:

Haoda 1600-1800 times dilution rinsed fruit trees caused by excessive application of compound fertilizer caused by root burning and yellowing: Haoda 1500-2000 times alone flushing, about two effective intervals of 10-20 days.

One is a deficiency of nutrients, iron deficiency, manifested in new leaves. The new leaves are yellowish. For the deficiency of nutrients, it is recommended that you use 60 times of ulcer liquid + 600 times of wofengsu + silicone sprayed on the trunk, branches and leaves of the tree.

One is to produce pesticide damage, which produces relatively uniform yellow leaves. You can refer to it.

Citrus yellowing is incurable if it is huanglongbing, in addition to huanglongbing, the causes of yellowing are: 1. Soil acidification.

Soil acidification in South China is serious, and it is easy to rot roots and rot roots, unable to absorb nutrients, which will inevitably lead to yellowing of trees.

2. Nutritional imbalance.

Conventional fertilization only uses nitrogen, phosphorus and potassium compound fertilizer, insufficient organic matter supplementation, and lack of medium and trace elements such as calcium, magnesium, boron, zinc, etc., resulting in the yellowing of the deficiency of nutrients.

3. Improper fertilization leads to root burning.

The farmyard manure is not ripe, and the fertilizer is applied intensively, and the fertilizer is in direct contact with the root system ......will lead to root burning, which will cause the tree to yellow.

It is recommended to apply micro-calcium + micro-energy, phosphorus and calcium, and promote root and tree.

Micro-replenish magnesium, supplement the key elements of photosynthesis, balance nutrition, prevent and alleviate the deficiency of yellow leaves.

The taproot absorbs water, and the hairy root absorbs nutrients.

Citrus yellowing, in addition to huanglongbing and nematodes, is mainly the problem of malnutrition caused by nutrient deficiency. The cause of the deficiency is nothing more than a problem with root absorption. In fact, most of the problems caused by root malabsorption come from soil problems.

For example, the long-term use of chemical fertilizers, flood irrigation, and a serious lack of organic matter and beneficial bacteria have led to soil compaction, salinization, acidification, and excessive harmful bacteria. In such a soil environment, the root system of plants is difficult to breathe, and is eroded by inorganic salts all the time, which will cause problems such as root stunting and root rot, resulting in yellowing of citrus.

To make citrus yellowing, the damaged soil must first be repaired. In order to repair the damaged soil, it is necessary to supplement a large number of organic matter and beneficial active bacteria in the soil, so as to improve the living environment of plant roots, take root and raise roots, absorb more nutrients, and the problem of national yellowing will be solved naturally, and it is not easy. To truly eradicate citrus yellowing, product selection is important.

Not only should the organic matter be abundant and clean, but the microbial active bacteria should also be of high quality and sufficient quantity. Henan Yikang Plant Immunity Technology produced Manchu Han full fertilizer with bacteria and meat, with meat meal, soybean meal, pepper cake, humic acid, 6 kinds of active microorganisms as raw materials, has an outstanding effect on the remediation of compacted salinized soil, and comprehensively eradicates the problem of citrus yellowing.

Etiolation.

Yellowing is a general term for the phenomenon of green and yellowing of the leaves during the growth of citrus, and its appearance marks the beginning of the decline of the tree.

Yellowing is an adaptation of plants to the environment. When seeds or other persistent organs germinate under the dark-free soil layer, the limited amount of organic nutrients can be used most effectively for the elongation of the hypocotyl or stem, ensuring that the seedlings can see the light when they are unearthed. People often use the method of shading to produce yellowed seedlings as food, such as leeks, garlic and bean sprouts, etc., which are tender and delicious because of the lack of cellulose.

Causes of yellowing of citrus

First, the soil is unsuitable.

Yellowing of citrus can be caused by soil discomfort. Severe soil compaction and poor air permeability will hinder root respiration, so that the leaves are prone to yellowing. In this case, it is necessary to loosen the soil frequently to increase the aeration capacity of the soil.

It is also necessary to fertilize it regularly to ensure that it is well nourished, so that it can recover faster.

Second, the lack of elements.

Citrus requires a lot of nutrients during the growth period, especially various elemental fertilizers. If nitrogen fertilizer is lacking, the leaves tend to turn yellow and the leaves become thinner. It should not be nitrogen fertilizer in time to ensure adequate nutrition.

If there is a lack of calcium fertilizer, the leaves and veins will turn yellow, and calcium fertilizer should be applied appropriately. Fertilizer treatment should be carried out according to different growth conditions.

Citrus yellow leaves are caused by many reasons, such as root problems, nutrient deficiencies, pests and diseases, improper circumcision, hormone overuse, etc.

If it is not the yellowing caused by citrus huanglongbing, it should not be a big problem, find the cause of yellowing and solve it, so that citrus can regain its vitality. Anzhou Sannong people try to analyze from the following aspects for reference.

Now there are more citrus plantings, and many of them have begun to be planted in the mountains, we have gone to see a lot of orchards, the water source has not been well solved and hurriedly planted, and the weather is dry and not drenched in time, which is also easy to cause yellowing of the leaves of new plants. The solution, of course, is to find a way to get drenched.

There are also many fruit farmers who are planted in paddy fields, or planted in relatively low-lying places, which are easy to accumulate water, and long-term water accumulation, the growth and development of tree roots are stunted, and it is also easy to cause yellowing of seedlings. The solution is to raise deep ditches to remove stagnant water and improve soil permeability.

Different soil qualities have different levels of trace elements, and the lack of trace elements will also lead to yellowing of citrus leaves.

Yellowing due to the lack of a trace element is also relatively common. In the case of boron deficiency, yellow spots begin to appear in the young leaves at the beginning, and then slowly begin to yellow. If there is a lack of iron, the leaves become thinner and yellow. Others, such as lack of zinc, are also prone to cause yellowing of leaves.

The solution is to supplement the soil structure, which can be improved by increasing organic fertilizer, and the fastest way is to spray the microelement fertilizer on the foliar surface. If boron is deficient, borax can be sprayed two to three times.

3.Yellowing caused by huanglongbing.

This is the most worrying problem, and it is also the most feared problem in citrus production at present. Now there are more occurrences of huanglongbing in different production areas, which should be paid enough attention.

Everyone knows that there is no cure for citrus huanglongbing, and the only way is to dig it up and burn it as soon as possible.

After planting, the seedlings have huanglongbing, most of which are caused by the seedlings with poison, and it is recommended to buy detoxified seedlings from the standardized virus-free seedling farm when planting.

This phenomenon is known as yellowing, which marks the beginning of a decline in the number of oranges, and is an adaptation of the plant to the environment.

This phenomenon is called yellowing, which is a general term for the loss of green and yellowing of leaves during the growth of citrus, and its appearance marks the beginning of the decline of the tree. Seeing this phenomenon, it is necessary to take corresponding measures.

Collectively referred to as "yellowing". It is a unified name for the decline and yellowing of the leaves of citrus tree species.

Yellowing of citrus can be caused by soil discomfort, lack of elements, infection or root problems, which need to be addressed according to different symptoms. When the soil is unpleasant, the soil can be loosened and the soil can be fertilized regularly; When the elements are missing, the plants can be applied with the required elements; Sprays can be applied when infected with diseases**.

1. The soil is unsuitable

When planting improperly, citrus will appear yellowing, what are the causes and solutions of citrus yellowing, citrus yellowing is usually caused by poor soil air permeability. At this time, it is necessary to strengthen management, fertilize the plants regularly, and properly loosen the soil during the planting process, which can increase the permeability of the soil.

2. Missing elements

Citrus yellowing may also be caused by the lack of elements during planting, at this time, different fertilizers should be applied to the plants according to different situations, when the citrus is lacking in nitrogen, the citrus will start to turn yellow from the leaves, and the leaves will become thinner, so nitrogen fertilizer needs to be applied to the plants. When calcium is deficient, the veins and leaves of citrus will turn yellow, and appropriate calcium fertilizer is required.

3. Infection with diseases

When planting, citrus infected with huanglongbing, mite pests, aphids, longhorn psyllids and other diseases will also cause yellowing of leaves, so different pesticides should be sprayed according to different insect pests. **Huanglongbing can be sprayed on the plant with wofonin or ulcert; **Aphids can be sprayed with pine borer emulsion or anti-aphid wettable powder on the plant.

4. Root system problems

The appearance of root-knot nematodes in citrus roots or unsuitable root environment will also lead to leaf yellowing, and when root-knot nematodes appear in the roots, avermectin can be sprayed on the plants, and the spraying needs to be diluted with 2000 3000 ml of water. If it is caused by the unsuitable root environment, you can change the plant to half of the soil.

<>1. The root problem is the cause of yellowing of citrus, and the solution includes the use of R. solanacearum rick, Wofengsu and Diliwang to irrigate the roots. 2. Deficiency is the cause of yellowing of citrus, and the solution includes formulating a reasonable fertilization plan. 3. Pests and diseases are the cause of yellowing of citrus, for the yellowing caused by mites, aphids, longhorn beetles and other factors, the dead branches and diseased branches can be taken out of the park in time when solved.

4. The external climatic conditions are the cause of the yellowing of citrus, and the solution includes doing a good job of drainage and irrigation.

First, the root system

1. Reasons. Yellowing root molting and decay caused by root problems will lose the ability to regenerate roots, which will lead to the obstruction of nutrient and water absorption of the tree, and lead to the yellowing of citrus, which is a relatively common factor causing yellowing.

2. Solution.

You can use R. solanacearum rick, wofengsu and Diliwang to irrigate the roots, which can quickly promote the germination of new roots, release a variety of elements in the soil, dissolve phosphorus, potassium and nitrogen, and supplement a variety of nutrients to crops.

2. Lack of nutrients

1. Reasons. Yellowing caused by nutrient deficiency citrus lack of trace elements or excessive trace elements will cause yellowing, this type of yellowing has a certain law, can be found through experience and comparison.

2. Solution.

A reasonable fertilization plan should be formulated, the fertilization should be even, the organic fertilizer should be applied more, and the products such as foliar fertilization should be used.

3. Pests and diseases

1. Reasons. Pathogens such as yellowing pathogens caused by pests and diseases invade citrus trees, and produce various secretions that can block the citrus transport system, resulting in the inability to absorb water and nutrients.

2. Solution.

For the yellowing caused by mites, aphids, longhorn beetles, etc., you can take the dead branches and diseased branches out of the park in time, and carry out centralized treatment, once fresh insect feces or insect pests are found, they will immediately use insecticides to prevent and control, and use whitening agents to coat the root neck, root stem and main branches in May.

Fourth, the external climatic conditions

1. Reasons. Under the condition of heavy texture and soil compaction, the root activity is significantly weakened, which will hinder the absorption and utilization of nutrients by the roots, and cause the leaves to lose green and yellow.

2. Solution.

The yellowing of citrus leaves caused by external climatic conditions should be drained and irrigated to avoid frost damage in winter, and the soil pH value should be adjusted when necessary. It should be pruned reasonably, so that the park is kept ventilated and light-transmitting, pay attention to the specific details of agricultural operations, and deal with the amount of fertilizer and medication and the time of use. The second peak of root growth is summer, before the aging of summer shoots and the occurrence of a large number of autumn shoots, high temperature and high humidity will affect the germination and growth of the root system, the nutrient absorption is relatively poor, and the nutrients consumed by shoots and fruits are relatively large, which will make the roots molt and rot, and the fruit trees will yellow.

In the summer shoot germination period, fruit growth period and autumn shoot stage, Liangguoan 300 times spray can be used once, and wofeng 600 times spray can also be added 1-2 times, which can effectively prevent the common yellowing of citrus in citrus.