What is the cause of the cracking of the bark of the seedlings of the small leaved boxwood?

The trunk of boxwood trees is debarked, and there are insects on the trunk; excessive dehydration; Fungal infections.

Maintenance small-leaved boxwood does not pick the soil, more resistant to barrenness, however, long-term this will also have poor growth, so it is necessary to properly apply Bika water-soluble fertilizer or turn over the pot to change the soil, so that the soil can be moderately fertile, for pearl boxwood, it likes warmth, not resistant to exposure to the sun, in the summer high temperature needs proper shade, like moisture but not resistant to stagnant water, watering management should also be appropriate, I suggest that the general is not dry and not watering, the ventilated environment is as much as possible more appropriate, proper pruning can also make the growth more robust.

1. When you plant large-leaved boxwood plants with too dense spacing, there will be defoliation, which is what friends in the industry often say, "covering off leaves". Generally, it will appear in the large-leaved boxwood hedge seedlings, and to solve the large-leaved boxwood defoliation in this case, only need to increase the plant spacing and row spacing of the boxwood in the planting process, and prune it in time, which will completely solve the large-leaved boxwood leaf litter. The large-leaved boxwood planted in this way will not lose its leaves.

2. Spring and autumn, the change of seasons, large-leaf boxwood will also have a slight defoliation, but this appearance is not obvious, this is a normal phenomenon, autumn November, and spring at the end of February and early March, large-leaf boxwood metabolism, so there will be a slight defoliation in autumn, and the old leaves fall off after the new shoots are ready to sprout in spring, but the spring is not very obvious. However, it does not affect the ornamentality of the large-leaved boxwood at all, and it is still green from a distance.

3. When leaf spot disease occurs in large-leaved boxwood, if it is not sprayed in time to prevent and control it, the leaves will fall off and the branches will be bare, and even the plant will die. Control measures: strengthen cultivation management, promote the growth of plants, and improve disease resistance.

Low-lying areas should do a good job of ditching and drainage to prevent water accumulation. In the early stage of the onset of large-leaved boxwood, spray 1000 times of 50% carbendazim wettable powder, or 500 times of 75% chlorothalonil wettable powder, or 800 times of 50% antibacterial special wettable powder. Spray 1 time every 10 days or so, 3 or 4 times in a row, you can achieve obvious results.

Reason 1: The planted large-leaved boxwood plants are too dense. Workaround:

In the process of planting, increase the plant spacing and row spacing of boxwood, and prune in time. Reason 2: Too much water accumulates, resulting in "waterlogging" in the roots.

Solution: Loosen the soil around the roots of the boxwood tree and evaporate some of the water. Reason three:

Leaf spot disease occurs in boxwood trees. Solution: Strengthen cultivation management to promote the growth of plants and improve disease resistance.

Low-lying areas should do a good job of ditching and drainage to prevent water accumulation.

Hello, there are two reasons for the yellowing of leaves: one is that the roots of the tree are sick, resulting in a serious lack of nutrients absorbed by the root system, resulting in the canopy.

The branches and leaves lack nutrients and turn yellow. The roots of poplar trees are poorly aerated, the soil water content is too high and the water quality is problematic, the root system is seriously hypoxic and the growth is poor, the metabolic function of the tree is poor, and the leaves are yellow. Second, the occurrence of tree diseases and insect pests is more serious, and the prevention and control of pesticides is not sprayed in time, resulting in yellowing of leaves.

Poplar. Poplar cultivation management techniques.

1. Watering and fertilizing.

For large trees, the adaptability is very strong, so the number of fertilization can not be too much, to avoid affecting the growth and development of poplars, if you want to fertilize, it is best to apply fertilizer once in autumn and winter. In the process of fertilization, you should not simply sprinkle the fertilizer on the surface of the tree, you should dig a few small pits around the tree and sprinkle the fertilizer into the pit, so that the fertilizer can penetrate into the roots and improve the growth ability of the poplar. If it is a poplar seedling, it is recommended to use a water-soluble fertilizer, which can quickly replenish the nutrients needed for plant growth.

Such as fertile leaf water-soluble fertilizer.

2. Weeding and loosening the soil.

In the process of poplar growth, the staff not only has to clean up the weeds, but also loosen the soil, so that the poplar can better respirate.

Roots can better absorb nutrients and water, and increase the vitality of roots.

3. Prune branches.

When there are many branches, it is necessary to repair them in time, and when repairing the branches, it should be repaired at about 30 cm of the predetermined incision. In the process of repair, the poplar tree should be protected, and the bark should not be damaged, otherwise the quality of the poplar tree will be affected.

4. Prevention and control of pests and diseases.

The causes of poplar yellow leaves are varied, sometimes, the soil is not fertile enough, lack of necessary nutrients, will also cause poplar leaves to turn yellow, at this time, you can supplement some iron-rich organic fertilizers, so that poplar leaves are more green, at the same time, you can also add a certain quality of ferrous sulfate to the soil, so that the soil has more nutrients, effectively prevent and control poplar yellow leaf disease.

Because the soil is not fertile enough and lacks the necessary nutrients, it can also cause the poplar leaves to turn yellow.

What causes the yellowing of poplar sapling leaves? The onset symptoms of poplar yellow leaf disease are: the young leaves at the top of the branches appear first, followed by the whole leaves.

The mesophyll of the diseased leaf is light green, yellow-green or yellowish-white, and the veins are milky white. The middle lobes on both sides of the veins are still green, showing a green reticulate structure. As the symptoms worsen, the green color on both sides of the veins will gradually fade and disappear, giving the entire leaf a yellowish-white color.

Diseased leaves become smaller and thicker. The leaf margins of some diseased plants will also be scorched and curled, and finally the whole leaf will be scorched and peeled off. The chlorophyll content, net photosynthetic rate and transpiration rate of diseased leaves decreased sharply.

The internodes of the branches are short, the growth is small, and in severe cases, it can cause the death of some branches and the whole plant.

<> investigations and experiments have proved that soil nutrient deficiency (absolute deficiency) and iron deficiency (reactive iron deficiency) are the direct cause of poplar yellow leaf disease. The long-term application of livestock and poultry manure in livestock and poultry farms leads to an increase in available phosphorus, copper, zinc and manganese in the soil, and the pollution of phosphorus and heavy metals in the soil (relative deficiency) is the main cause of poplar yellow leaf disease. Soil is the root cause of poplar yellow leaf disease.

Poplar yellow leaf disease is a non-communicable disease, a physiological disease of iron deficiency, and the physiological metabolism of plants is unbalanced. Once the disease occurs, the leaves cannot synthesize chlorophyll, causing the leaves to lose green and photosynthesis cannot be carried out; Then, due to the lack of nutrients (a product of photosynthesis) in the roots, the physiological activity gradually weakens, and the plant grows slowly until it dies.

The occurrence and distribution characteristics of yellow leaf disease, the uniformity and consistency of the distribution of diseased plants: on poplars, once discovered, poplar yellow leaf disease often occurs in one or more rows at the same time, and there are scattered plants, or multiple rows occur at the same time, and the degree of incidence is very consistent between plants, and there is no process of institutional transfer or gradual spread from the disease center to the surrounding when it is found in a growing season. The development of symptoms is characterized by uniformity and consistency:

The severity of the disease may range from mild to severe, but the development of symptoms is basically the same, and the disease development is basically the same between different plants and different diseased leaves of the same plant in the same forest area. The occurrence of the disease is sudden: in many places, yellow leaf disease was not found in the previous year, and a large area of yellow leaf disease appeared in the second year, especially in nurseries.

The symptoms have the phenomenon of natural recovery and are not contagious: the survey found that some seriously ill trees, without taking any measures, returned to normal in the second year, and after returning to normal, the symptoms of yellow leaf disease did not occur again for many years, and the experiment proved that poplar yellow leaf disease is not contagious. This phenomenon is consistent with the characteristics of noncommunicable diseases.

Forestry and management practices have an important impact on the occurrence of poplar yellow leaf disease: in the survey, it was found that when the same forest belonged to different households, one or several households often had poplar yellow leaf disease, while other adjacent farmers had mild or no poplar yellow leaf disease incidence. Further investigation found that there were great differences in afforestation patterns or management measures among different farmers.

Poplar trees that have suffered natural disasters or man-made damage in the past are more severe.

This phenomenon may be caused by a lack of nutrients or trace elements required by poplars in the soil, or because the local temperature is not enough and photosynthesis is not enough.

It may be caused by a lack of nutrition, or it may be caused by a lack of light, and there are many reasons for this situation, which should be determined according to the actual situation.

It may be that the nutrients in the soil are relatively small, and the seedlings are not able to better absorb some nutrients, so the leaves will turn yellow.

Hello dear, most of them are caused by improper water and fertilizer or environmental factors. 1.In general, if the leaves of the boxwood tree are dry, it can be saved, and as long as the roots do not wither, the boxwood tree can still live.

At this time, we need to find the cause of the dry leaves of the boxwood tree first, and then treat the symptoms according to different reasons. 2.If the root system of the boxwood tree dies, the boxwood will gradually dry up because the leaves absorb the waste and lack nutrients.

3.Overwatering: If the boxwood is overwatered, it will cause the boxwood leaves to turn yellow, which is characterized by the fact that the old leaves of the boxwood do not change significantly, but the newly grown leaves will turn yellow.

At this time, the solution is very simple, that is, you need to control the moisture. 4.Too little watering:

If the boxwood leaves turn yellow from the bottom up, it may be caused by a lack of water. If the water shortage is too long, it can even lead to the death of the whole plant. The solution to this situation is the need for timely watering.

5.Nutrient insufficiency: Insufficient nutrients in boxwood can also lead to yellow leaves, and if this is the case, then the young leaves and young stems of boxwood will turn yellow first.

When this happens, it is necessary to apply fertilizer in time, but it is necessary to pay attention to thin fertilizer and frequent application, so as not to cause root burning. I hope mine can help you. I hope mine can help you.

Take a closer look to see if there are any insect pests, the temperature is high in summer, the plant growth is not adaptable, there is a lot of rain, pay attention to drainage.

Large-leaved boxwood blightLarge-leaved boxwood wilt is a common and devastating disease of large-leaved boxwood in recent years, which is characterized by fierce onset, rapid infection rate, and great impact on greening effect.

Symptoms:At first, the upper leaves of individual branches lose water, and then the whole branch and the whole leaf branch lose water. In the later stage of the disease, the leaves are yellowish-white, and severe infection will lead to plant death.

The causative agent is Fusarium which is present in the soil. The germs mostly invade from root wounds, but can also directly invade plants. Generally, the onset of the disease begins in mid-May, and the peak of the disease is in July and August, and some plants do not exceed a week from the onset of disease to death.

Prevention and control measures:Irrigate the roots with 1500 times of ground color, and then spray with photosynthetic pigment + tetramycin 1000 times.

There are several reasons why the young leaves of the poplar tree turn yellow: one is watered too much. Second, too little watering. Three, lack of light. Fourth, the sun burns. Fifth, the lack of nitrogen fertilizer and phosphorus fertilizer will also cause all yellowing first, and then the new leaves will also turn yellow.

Yellowing of the leaves of poplar trees may have seedling yellowing. Yellowing of poplar seedlings generally occurs in alkaline plots, and is generally nitrogen deficiency or iron deficiency. Nitrogen, iron-rich fertilizers can be added to the soil.

Or use manganese-zinc wettable powder to spray the trees, but the concentration of the spray should not be too high, otherwise the leaves will be burned.

It should be normal for poplar seedlings to turn yellow in winter. Poplar leaves turn yellow, mainly to adapt to unfavorable growing conditions in winter. Generally, in late autumn and early winter, poplars, willows and other deciduous tree species will have yellow leaves and fall off; Yellowing and defoliation of plant leaves in winter is an adaptation of plants to the dry and cold environment in winter, and new leaves can germinate after the temperature warms up in the following spring.

Poor ventilation in summer, heavy irrigation, excessive fertilization, and root problems can all cause the leaves to turn yellow as a whole.

If you want to prevent the natural yellowing of the leaves, the first thing is to prevent the plant from rotting the roots, so that the leaves can get sufficient nutrition, and then it is necessary to eliminate external injuries and prevent the spread of wounds. Fertilization can choose the fertile leaf water-soluble fertilizer series.