How to manage citrus after harvest？

After the citrus is harvested, the citrus trees gradually enter the dormancy period, and various germs and pests also enter the overwintering stage. Our growers should strengthen the management of citrus trees, apply good fertilizers, clear the garden in winter, eliminate pests and diseases, reduce the number of pests and diseases, and reduce the damage in the next year.

Scientific application of winter fertilizer

1. Restore tree vigor after picking

Generally, the orange orchard cannot be pruned immediately after harvesting. Select the appropriate pesticide according to the citrus variety, tree age, cultivation management, climate conditions, and occurrence of diseases and insect pests. Spray in suitable weather and spray evenly to prevent pruning. Orally infected with germs, combined with plant growth regulators and foliar fertilizers to quickly replenish nutrients, restore tree vigor, and promote flower bud differentiation in the coming year.

2. Scientific application of winter fertilizer

Citrus winter fertilizer is the base fertilizer applied in winter. The types include bio-organic fertilizers, ordinary organic fertilizers, compound fertilizers, and medium and trace element fertilizers. Restoring tree vigor, preserving leaves, prolonging leaf life, and preventing winter defoliation. Organic fertilizers slowly release nutrients under the activity of microorganisms, while citrus grows slowly in winter, and the absorption capacity of roots becomes weak, and its absorption of nutrients is also slow. At the same time, winter fertilizer can make the tree accumulate a certain amount of organic nutrients in winter, which is needed for budding and flowering in the next spring. At the same time, the accumulation of nutrients can enhance the frost and drought resistance of the tree, which is conducive to safe wintering.

3. Soil improvement operation

Loosening the soil can improve soil permeability, promote root growth, and restore tree vigor. On the other hand, it can also improve the plant's ability to resist diseases and insect pests and prevent cold and drought. In addition to the differentiation of flower buds and the promotion of new roots, it can also effectively kill some overwintering diseases and insect pests in the soil.

Pruning branches

Prune diseased and insect branches, dead branches, and fallen branches after harvesting, such as scale insects, cankers, soot, etc. Harmful branches and leaves, short-cut fruit-bearing branches in the canopy and peripheral decaying branches Prune and renew branches in rotation. If the tree is closed, pruning methods such as opening skylights and digging side doors can be carried out to increase the ventilation and light transmission of the tree body, expand the tree crown, and reduce the difficulty of management in the coming year. Especially in orchards with outbreaks of canker disease, after the fruit is harvested, the diseased branches and leaves on the trees will be removed and destroyed outside the garden to reduce overwintering pathogens, which will be very helpful for the prevention and control of canker disease next year. The incision left after pruning must be coated with wound healing agent to seal the wound and protect the callus. In addition, remove weeds in the orchard, dig out stumps and diseased trees, and loosen the soil in the whole garden to kill underground overwintering pests.

Clear the orchard

Winter is the dormancy period for most pests. Most of them hide in the soil, weeds, or diseased branches and leaves to survive the winter. Therefore, after the pruning is completed, the garden cleaning agent is sprayed in time to protect the wound and kill the orchard The pests and diseases that overwinter in the country can reduce the occurrence of pests and diseases in the coming year, and reduce the difficulty and cost of management. It is best to spray pesticides to clear the garden three times, and spray pesticides to clear the garden 15 days after the fruit is harvested. After an interval of more than 20 days, spray again. The third time is to use the spray before the spring shoots sprout to prevent them from sucking the juice due to the germination of spring shoots and spreading Huanglongbing. Pay attention to the thorough spraying requirements. In addition to the leaves and the back of the leaves, the branches must also be sprayed to kill the overwintering scale insects, mites, soot, and moss.

Insulation and antifreeze

Before the frost, wrap the tree trunk with grass, cultivate the tree tray, whitewash the trunk, and spray antifreeze agents to prevent frost damage and resin disease. For unpicked fruits, insulation measures must be taken, and antifreeze agents should be sprayed to prolong the freshness period and add sugar for coloring.