After May, the temperature rose rapidly, the rain was too much, and the citrus also ushered in a critical period from falling fruit to stabilizing fruit. Suitable climatic conditions are likely to cause a lot of shoots in summer. To consolidate this month's young trees should seize the opportunity, attack the strong shoots, and expand the canopy; for fruit trees, the key point is to deal with the opposition between the shoots and reduce fruit drop.
Stable Fruit
Most citrus fruits have entered the second physiological fruit dropping period this month. Because the fruit dropping lasted for a long time, the fruit preservation work should not be careless.
For those who have not yet carried out the second protection, you should choose a fine weather and spray the fruit protection medicine: gibberellin + sea spirit biological stimulant foliar type + phosphorus and potassium source reservoir.
Regarding types with severe second physiological fruit drop, such as sugar tangerines, circumcision is required to achieve the purpose of stabilizing the fruit and controlling the shoots.
Generally speaking, circumcision after the spring shoots turn green is the most suitable, but for trees with a lot of fruit, it can be carried out after the fruit is divided, and the next time the fruit fertilizer is stabilized before the circumcision after the second protection. The fertilizer is a source of phosphorus and potassium, etc. High-potassium fertilizer mainly promotes fruit swelling and suppresses the germination of summer shoots together.
Pay attention to avoid applying fertilizer as much as possible before the girdling wound is healed. At this time, the absorption capacity of the root system is relatively weak and it is easy to form rotten roots.
Control summer shoots
For fruit trees, there are many shoots in summer, which will inevitably consume a lot of nutrients. The nutrient competition among the shoots is fierce, causing a lot of fruit drop. Therefore, controlling summer shoots is an important task this month.
Common methods for controlling summer shoots include tree control (control shoots with fertilizer, shoots with shoots, and control shoots with fruits), manual control and drug control (shoots control, shoots pressing). Here are a few points worth noting. .
â‘ The purpose of controlling shoots is to alleviate the opposition between shoots and fruits, not to remove summer shoots. Even if it is about fruit-hanging trees, summer shoots must have a positive meaning. For example, for trees with a large amount of fruit-hanging, an appropriate amount of summer shoots can wash away part of the fruit, reduce the amount of fruit thinning, and increase the leaf-fruit ratio, which is conducive to tree cultivation. . In addition, with regard to the very many species of top fruit, such as Maogu mandarin, wo mandarin, etc., proper retention of some summer shoots can temporarily block part of the sun during the high temperature period, so as to reduce the occurrence of sunburnt fruit.
â‘¡Shooting control is a comprehensive approach. Although control shoots are often divided into several types of methods, they are mostly used cooperatively in actual operations. If the fertilizer is applied reasonably in the early stage, the germination of summer shoots can be reduced. In the later stage, it can be used to wipe the shoots manually to achieve an outstanding shoot control effect.
â‘¢ Reasonable use of tip control techniques. For example, when wiping the tips manually, do not wipe off all of them, leaving the weakest one to avoid wiping more and more summer tips; the first batch of summer tips can be preserved like strong trees, while weak trees with a lot of fruit are not so good. Suitable for. In addition, it is advisable to try drugs on a small scale first to avoid unnecessary losses when using drugs to control shoots, especially for killing shoots.
Sapling management
Summer shoots grow vigorously, with long, thick and strong branches. For young trees, promoting good summer shoots is the key to saplings to cultivate outstanding tree shapes and form a vigorous canopy.
Attacking shoot fertilizer: 10-15 days before shoot, apply a balanced or high-nitrogen water-soluble fertilizer (or compound fertilizer) + 300 times solution of the root application of the sea spirit biological stimulant to improve the nutrient quality of the tree. A strong root system promotes regular growth of summer shoots.
Unanimous release of shoots: Although summer shoots grow vigorously and vigorously, their hair is not regular. Generally, the top buds are wiped 1 to 2 times to remove the top dominance, and let the lower buds emerge first, and the new shoots of the plant are regular. This can consistently promote the release of new shoots, facilitate the prevention and control of pests and diseases, and can quickly form a bumper canopy.
Strong shoot fertilizer: apply 1~2 times strong shoot fertilizer after the shoots emerge. The method of fertilizer application is ditching of phosphorus and potassium source reservoir or high potassium water-soluble fertilizer or compound fertilizer + sea spirit biological stimulant root application type 300 times liquid to speed up The summer shoots are old and mature, and the competition is drawn again, which is good for forming a vigorous canopy.
Cultivate the tree shape: the summer shoots that are short and too long should be cut and the bud eyes should be outward. Remove the young fruits that have not fallen in time to gather nutrients to supply the shoots; pay attention to transforming or pruning the elongated branches. For the larger space, you can cut short to promote the shoots. After budding, pay attention to the thinning operation. Keep 2~3 branches for each base branch. If there is a large space, you can leave as many as 4~5. Regarding the tree type that is too compact, it should be combined with branching and shaping to open the tree shape and cultivate a tree that is conducive to fruit-hanging. Type structure.
After removing the above, the diseases and insect pests on citrus will enter a high incidence period this month. The diseases mainly include anthracnose, canker, brown spot, etc. The main pests are leaf miner, scale insect, psyllid, rust tick, longhorn beetle, Attention should be paid to the prevention and control of grasshoppers and other cicadas. At the same time, do not ignore the dead corners of the grass and other trees.
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