How to prevent wind and snow in winter when wind and snow invade and break branches and blow fallen leaves?

Citrus is a major cash crop in the south. In winter and spring, oranges are vulnerable to cold wind and heavy snow, resulting in wind and snow damage. The relevant wind and snow prevention measures of citrus are introduced as follows:

Citrus windbreak

First, guard against cold and wind damage:

Characteristics of cold wind damage: when blowing cold wind, suddenly a large number of fallen leaves, but different from frost injury. Freeze-damaged fallen leaves: leaves gradually turn brown and die after freezing, and stay on the branches for 1-2 weeks before falling off; cold wind damage fallen leaves: keep green. Citrus in hilly and mountainous areas, especially on hillside and flat land, is often caused by low temperature and wind in winter, especially the branches and leaves on the windward side of citrus. Cold wind damage to fallen leaves is due to the difficulty of citrus root water absorption caused by low temperature, but the enhancement of branch and leaf transpiration, resulting in the imbalance between transpiration and water absorption. Precautions against cold wind damage:

(1) to set up windbreaks.

(2) cultivate soil to cover and irrigate in winter to prevent the soil temperature from dropping and maintain the soil temperature.

(3) the canopy is covered with rice straw and polyvinyl film, and it can also be sprayed with water or anti-steaming heat preservation agent, which can reduce defoliation.

(4) Straw bundling, in areas hit by cold wind, each citrus plant was bundled with straw from late November to early March of the following year, with a leaf preservation rate of more than 80%. On the premise that the branches are not broken, it is better to tie them tightly. Prevent the snow from breaking up. The trunk and branches should be painted white. Before bundling branches, spray should be used to control mites.

Clear the citrus snow

Second, prevent snow damage:

The heavy snow broke the citrus branches, causing a serious disaster. Especially when the trees are windy, the snow cover is thick and the snow damage is heavy. Generally, the trunk is high, the crown is upright, the angle of the main branch is smaller (such as Ponkan, etc.) than the trunk, the crown is open, the angle of the main branch is larger (such as Wenzhou mandarin), and the snow damage is serious. Snow relief measures are as follows:

(1) when it snows heavily, snow should be shaken off the trees as soon as possible to avoid breaking the branches.

(2) to deal with the broken branches in time. For completely broken, saw off as soon as possible, cut the wound, apply wax and other protective agents to prevent decay. Those that have been torn but not broken should not be sawed off easily. Should first be propped up with ropes or pillars, restore the original state, the injured place should be coated with wax, fresh cow dung, yellow mud, etc., to promote its healing and restore growth.

(3) tidy up the canopy. If the snow is serious, the undamaged branches and leaves should be trimmed as lightly as possible; for those that have been torn and bound, pruning should be aggravated according to the severity of the injury, so as to reduce the consumption of nourishing water so as not to dry up. The new shoots under the broken branches should be properly retained for renewal.

(4) to strengthen post-snow management. After the snow damage, the tree is weak, so we should apply fertilizer in time to restore the tree potential. At the same time, tree wounds should be prevented in time to prevent resin disease, bark bugs and so on.

(5) to carry out high grafting or replanting. It is feasible to replace the broken young citrus, such as those with bad varieties, and dig up and replant new plants if they can not be renewed.