Why do citrus curl leaves? How can it be prevented?

In early spring, citrus is prone to cold damage, especially in early spring, the branch tissue is tender and susceptible to frost damage, resulting in reduced physiological activity, weak tree strength, insufficient nutrition, and leaf rolling. The roots of some old, weak, diseased and damaged trees have weak absorption capacity, and the nutrients absorbed from the soil cannot meet the nutrients required for nutrient consumption and spring shoots, flower bud differentiation and root growth in winter, resulting in the normal growth of new leaves in the aboveground part and curling of leaves.

Because aphids are a type of pest that feeds primarily on citrus leaves, they can cause damage to citrus leaves, causing them to curl. Underground nematodes also harm citrus roots, preventing them from absorbing enough nutrients and water to support normal growth, which are responsible for curling citrus leaves. A bad citrus root system can also lead to leaf rolling; Improper fertilization can lead to root burns and injuries; Moisture in the soil leads to degumming roots; Root-knot nematodes damage roots; Small trees, especially new trees, will have curly leaves if the new roots do not grow well.

<> hanging fruit trees are not buried in winter fertilizer, the tree body is weak, and the leaves in the whole garden are serious, and some of them turn yellow; When digging the root system, the root system grows well and the soil is not dry. Orchards may fail to replenish nutrients in time to restore the strength of the trees after picking fruits, resulting in nutrient deficiencies, resulting in leaf rolling. It is recommended to use water-soluble fertilizers, which should be watered every 15 days or so, and the foliar surface should be supplemented with trace element fertilizers such as boron and zinc.

To strengthen nutrient management and restore the strength of the tree, it is necessary to replenish the leaves and roots at the same time.

Before the germination of new shoots, strong root fertilizer was applied, and the roots were soaked with humic acid and alginic acid to add nutrients to the roots and improve the structure of soil aggregates. It is necessary to nourish roots, promote roots, and strengthen roots, with a good root system, strong absorption capacity, a naturally strong tree body, good leaves, fast greening of leaves, photosynthetic production of nutrients, and reversal of tree potential. Replenish nutrients from the root system before new shoots appear.

Improve the structure of soil aggregates, provide good microecological soil environmental conditions for roots, improve root receptivity, promote rooting, and enhance tree dynamics.

It is likely that the leaves are curled due to the influence of pests and diseases, and it may also be due to insufficient nutrition. Be sure to choose high-quality varieties, and then you should also spray pesticides regularly, remove pests in time, and ensure that the light is sufficient, and the temperature of planting needs to be preserved.

It is caused by illness, or because of lack of water, and it is likely to be caused by malnutrition, so you must pay attention to watering, pay attention to supplementing nutrients, and you can use some fertilizer.

There are several reasons for leaf curling in citrus trees, such as root nematode infestation, lack of elements and unsuitable growing environment. If it is caused by root nematode infestation, it is necessary to do a good job in root nematode control, and once found, timely irrigation for prevention and control; If there is a lack of elements, it is necessary to supplement the elements needed for the growth of citrus trees in time, and organic fertilizer or multiple compound fertilizer can be applied; If it is caused by an unsuitable growing environment, it is necessary to transplant the plant into an environment suitable for its growth.

Citrus tree leaf curling causes.

Root nematode infestation: If the citrus tree is attacked by root nematodes, it will cause the root system to grow small nodules, causing the root system to not absorb nutrients and water normally, which will cause the leaves to curl due to lack of nutrient water.

Lack of elements: If citrus trees are deficient in trace elements such as boron and calcium, then there is a risk that their leaves will curl.

The growing environment is not suitable: Citrus trees can cause leaf curling if they are grown in drought, low temperatures, high temperatures, and acidic soils.

Citrus tree leaf curling treatment.

Remove root nematodes: If the citrus tree is infested by root nematodes, it is necessary to do a good job in root nematode control, once the root nematode is found, it is necessary to irrigate in time to prevent and control.

Increase fertilization: If the plant is curled because of the lack of elements, it is necessary to replenish the elements needed for the growth of citrus trees in time, and you can apply organic fertilizer or multi-compound fertilizer to increase the content of trace elements in the soil.

Choose the right environment for planting: If the leaves of a citrus tree are curled due to an unsuitable growing environment, the plant needs to be transplanted and moved to a soil environment suitable for its growth.

Citrus trees prevent leaf curling.

Control pests and diseases: The temperature gradually rises in spring, insects and germs also begin to be active, we must take preventive measures, you can spray Liangguoan + garlic oil + Mujian matrine, effectively prevent red spiders, thrips, scale insects potato resistance, canker, anthracnose and other pests and diseases.

Balanced supplementation of medium and trace elements: When fertilizing citrus trees, it is necessary to apply fertilizers containing different elements in a balanced manner, and must not apply a large amount or a small amount of fertilizer of a certain element.

The reason for the curling of old citrus leaves is mainly due to the lack of fertilizer, and it is better to add some all-element compound fertilizer when watering. The leaves are often sprayed with potassium dihydrogen phosphate, and the leaves are brighter and greener.

Citrus fertilizer and water management.

Citrus requires irrigation during the dry months, so it is essential to irrigate when the winter is dry and the temperature is above 13 degrees Celsius. In addition, dehydration is dangerous, it allows fruit moisture to flow to the leaves and causes fruit wilting. In the past, irrigation was mainly done by furrow irrigation or sprinkler irrigation in the upper part of the canopy, but sprinkler irrigation has the risk of salinization, and furrow irrigation can cause a decrease in soil permeability.

Drip irrigation and micro-sprinkler irrigation under the canopy are now trending towards strip irrigation, with part of the soil surface kept dry. Orchards that have not fully applied phosphorus and potassium fertilizers before planting should increase the application of phosphorus and potassium fertilizers year by year; 1 month after the young tree is planted, the new roots begin to move, dilute manure water can be applied, the amount of fertilizer should be less than more, it should be light and not thick, especially chemical fertilizer, more attention should be paid to the application to avoid hurting the roots. Before each new shoot pumping and the growth period, apply 1 2 times of fast-acting fertilizer, and strive to pump 3 4 times of shoot in 1 year, that is, from the end of February to the beginning of March, the spring shoot fertilizer, the middle and late May of summer shoot fertilizer, the early and mid-July of early autumn shoot fertilizer, and the late November of winter fertilizer.

In areas prone to frost damage, fertilization should be stopped in August and October to prevent the extraction of late autumn and winter shoots to avoid the consumption of nutrients and cause frost damage. In the second year after planting, the amount of fertilization should be gradually increased, combined with the application of organic fertilizer in combination with soil modification, the amount of phosphorus and potassium fertilizer should be increased, and an appropriate amount of lime should be added to the acidic soil to cultivate dense root groups and robust autumn shoots, laying the foundation for the third year's fruiting. After the shoots are cut or topped, apply 1 time of strong shoot fertilizer, and after the autumn shoots turn green, add 2 times of manure water. When fertilizing, attention should be paid to the difference between weak trees and strong trees.

In order to ensure the normal growth of weak trees three times and increase the number of new shoots, the summer shoots can be pumped in the first year after planting, and the topping and fertilization are carried out when the summer shoots grow to 7 or 8 leaves. In the second year after planting, the summer shoots of weak branches should not be shortened, and the growth of new shoots after stubbing is weakened due to poor nutritional conditions.

Apply a few kilograms of organic fertilizer to the roots, water some water, and you're good to go, you can try it.

Today I'm going to talk about a common problem in citrus – leaf rolling. In spring, there are often curls in citrus orchards, some are curled with new leaves, some are curled with old leaves, and even new and old leaves are curled in serious cases.

Causes of old leaf curling.

1. Root causes: few hairy roots, black roots and rotten roots; improper fertilization, burning and injuring roots; The soil is waterlogged, and the roots are soaked.

2. Affected by root-knot nematodes.

3. Small trees, especially newly planted trees, will also have curling leaves before the new roots have grown.

4. The hanging fruit trees had more fruit last year, the fruit was picked late, the post-harvest fertilizer was insufficient or the absorption was not good, and the tree did not recover.

5. Pesticide damage: pesticide damage caused by alkyne mite, herbicide, gibberellin, 2,4-d, etc. may cause leaf curling.

Solution. Promote the roots and strengthen the roots.

To promote roots, the key elements phosphorus and calcium should be supplemented, and fertilization should be applied according to the age of citrus trees, for example, 3-5 kg of water for newly planted trees, 5-10 kg of water for one-year trees, 20-30 kg of water for two-year trees, and 50 kg of water for hanging fruit trees. The older and larger trees should be watered more to ensure that the roots are drenched.

Control of nematodes. If it is leaf curling caused by nematodes, the roots should be irrigated with nematode medicine. nematode chemical control agents include thiazolphos and avermectin; The commonly used biological control mainly includes Verticillium pachyspora, Penicillium lavender and Bacillus subtilis.

Lack of nitrogen, phosphorus, potassium, calcium, boron, magnesium, iron, zinc, sulfur, copper, molybdenum and other nutrients will cause yellowing and early fall of citrus leaves. When the soil is dry, the root growth is inhibited, and when the transpiration of the tree is greater than the water absorbed by the roots from the soil, the leaves will wilt and curl, and in severe cases, the petioles will fall off. When water accumulates, the soil is poorly aerated and causes root rot, which affects the absorption function, and in severe cases, it causes yellowing of branches and leaves and leaf loss.

Spider mites, rust ticks, scale insects, anthracnose, yellow spot, foot rot, powdery mildew and other diseases and insects can cause early leaf fall. Among them, red spiders, scale insects, anthracnose, and macular disease are the most serious, and the failure to control often leads to a large number of defoliation in winter and spring. Leaves need to be grown with proper light.

The crown is closed, the light is insufficient, the inner chamber leaves are enlarged and thinned, the leaf color is light green or even yellow, and the assimilation amount is significantly reduced. Unfavorable factors such as pesticide damage, fertilizer damage, strong winds, frost damage, and improper circumcision (stripping) can also cause abnormal leaf fall.

Causes of citrus leaf curling and prevention methods!

1. Leaf curling caused by aphids.

This is basically known to everyone, basically occur on the new leaves, aphids because it is easy to resist the medicine, so the prevention and control has become a headache for many people, requiring him, constantly changing the drug or compounding a variety of drugs, sometimes the effect is not necessarily good.

Solution: When playing aphid drugs, you can add anti-synergists that can eliminate aphid resistance, this kind of additives can generally solve the problem of aphid resistance, solve the problem of aphid resistance, and the selection of pesticides is much simpler and easier, and it is generally better to use organic fluorine anti-synergist.

2. Leaf curling caused by boron deficiency.

It is generally manifested as leaf vein cracking, leaf roughness, wrinkling, petioles and branches are thick and short, and the absorption and utilization of boron is relatively low.

Solution: Foliar spraying of boron-calcium foliar fertilizer that can be supplemented with calcium and boron is used to improve the absorption and utilization rate of boron. In addition, supplementing plants with boron and calcium at the same time can also improve their respective effects, and supplementing boron and calcium at the same time can solve many problems and kill multiple birds with one stone.

3. Insufficient nutrition in comprehensive scattering.

These are often caused by too many results in the last year, insufficient fertilization in autumn, or insufficient fertilization in spring, or weak root system in spring, broken roots and other problems cause citrus lack of fertilizer to cause leaf rolling, generally new leaves and leaf rolls can also be well solved, old leaves and leaf rolls belong to the serious lack of fertilizer, need to be fertilized and adjusted, and it is difficult to recover seriously.

Solution: generally with foliar fertilization, this time needs to be fast-acting, it is recommended to spray foliar boron and calcium foliar fertilizer that can be supplemented with calcium and boron, ground flushing or dropper liquid highly concentrated balanced water-soluble fertilizer, water-soluble fertilizer containing organic fluorine is better.

Because it can solve the problem of rapid and balanced absorption of citrus, it is not easy to cause soil compaction, maintenance of roots, stems, leaves and fruits, nutrient supplement and absorption are more sufficient, and the effect is better, because our fertilization is to solve the problem, so it is better to choose a more reliable organic fluorine water-soluble fertilizer.

4. Soil permeability is not good.

This reason will lead to weak root vitality, as the temperature rises, transpiration is strengthened, and nutrient production can not keep up, which can easily lead to leaf rolling.

Solution: Flush application of nutrient flush fertilization containing biological bacteria, that is, increase the number of beneficial viable bacteria in the soil, activate the soil and add nutrients to the root system, and the maintenance is integrated, and then the effect is better with the use of liquid balance water-soluble fertilizer.

5. Root system problems.

In addition to being related to weak roots, broken roots, and broken roots, this is also related to root-knot nematodes, which are also accompanied by yellowing symptoms, so it is necessary to control root-knot nematodes.

If it occurs in a large area, it is related to the deficiency of nutrients, and very few phenomena are related to diseases. From the perspective of the nutrient gear wheel, calcium itself is a component of the cell wall, so after calcium deficiency, the cell wall becomes thinner, the leaves will be thinner, and dull and dull, and the lack of calcium will also lead to a decrease in the absorption capacity of water and fertilizer after the root system deteriorates, so in the high temperature and dry season, especially when the old and high amount of the fruit containing the letter is relatively large, it is easy to roll the leaves. Flushing calcium supplementation promotes root growth, prevents and reduces the problem of calcium deficiency and leaf rolling, and underground flushing and application of micro-calcium supplementation to promote the healthy growth of roots and protect leaves and trees.