Causes and control measures of citrus abnormal defoliation in winter

Citrus is one of the most common fruit trees in our life, it is an evergreen fruit tree, there is little defoliation in autumn and winter, and once the abnormal defoliation occurs, it is bound to affect the yield and quality of the coming year. So what is the reason for the abnormal defoliation of citrus in winter? Come and have a look with the editor.

1. Causes of abnormal defoliation of citrus in winter

1. Lack of nutrition

The yellowing and shedding of leaves will occur when there is a lack of trace elements such as nitrogen, phosphorus, potassium and calcium and boron in citrus in winter, which is one of the main reasons for citrus fallen leaves.

2. Water imbalance

When the soil is too dry, the root growth of the plant is inhibited, and when the evaporation of the plant is greater than the absorption of the root, then the leaves will curl and the petiole will fall off seriously. In addition, in stagnant water, the soil permeability is poor, inhibit root respiration, a long time will rot roots, which will also cause aboveground branches and leaves yellowing, fallen leaves, serious plant death.

3. Poor lighting

The growth and development of leaves is inseparable from photosynthesis. if the plant is closed and the light is insufficient, then the inner leaves will increase and become thinner. The leaves are dim or even yellowed. On the other hand, the light in winter is already weak and can not be improved for a long time, which will make the inner chamber branches lose a lot of leaves.

4. Keep the harm

In the citrus growing period, red spiders, scale insects, anthracnose, yellow spot will cause the most harm, not timely control will cause a large number of leaves in spring and winter.

5. Other reasons

In addition, drug damage, fertilizer damage, strong wind, freezing injury and ring cutting may cause abnormal defoliation of citrus.

II. Prevention and control measures

1. Strong tree potential

In production, combined with deep application of phosphorus and potassium fertilizer and organic fertilizer, the root system should be deeply rooted, foliar fertilizer should be sprayed at the same time, reasonable pruning, timely drainage and irrigation, so as to cultivate strong tree potential and improve tree resistance. For the plants with drug damage, foliar fertilizer and brassine can be sprayed on the crown, branches and leaves, but for the phenomenon of falling leaves caused by improper ring cutting, foliar fertilizer should be sprayed in time or electric tape should be used to glue the ring cut, at the same time, within one month after ring cutting, avoid spraying stone sulfur agents and other pesticides that are easy to cause fallen leaves.

2. Do a good job in pest control

It is necessary to do a good job in clearing the garden before overwintering, to reduce the base number of diseases and insect pests, and to add 2jue 4murD to the garden, which is beneficial to the protection of leaves from freezing. For anthracnose and yellow spot caused by a large number of fallen leaves, once found that the need for timely prevention and control, reduce the harm, timely spray control in the growing season to protect the leaves.

3. Pay attention to anti-freezing

In addition to measures such as suitable planting, adequate base fertilizer and trunk whitening, we should also pay attention to spraying citrus deciduous leaves in winter before freezing after fruit harvesting; second, we should take emergency freezing measures. it is necessary to spray and potassium dihydrogen phosphate solution in time before frost to slow down the thawing of trees and restore leaf function.

4. Replenish nutrients

Attention should be paid to element deficiency in production, and once it is found that it can be prevented and treated in time, we should prescribe the right medicine to the case and apply fertilizer to what is lacking.

The above is the introduction of the causes and control measures of abnormal defoliation of citrus in winter. I hope it can help you. If you want to know more about it, please follow us.