1. Choose a garden in the selection of citrus sites, consider the impact of high temperature as a major factor, try to avoid heat cultivation. For example, in a large-climate environment, where suitable local microclimates are selected, conservation forests can be set up to improve the ecological environment, and cultivation in rivers and rivers can also reduce heat damage.

2. Choose a good variety should choose strong heat resistance varieties and rootstocks, such as the best selection of late-maturing varieties of Satsuma oranges, sweet oranges are best to choose nuclear species.

3. After the garden has been established, fertilization is carried out in the planting areas. The citrus plants grown on deep, loose and fertile soils have strong heat resistance. On the contrary, the heat resistance of the plants grown in the barren soil is poor.

4. To strengthen the cultivation and management to strengthen the cultivation and management can reduce the citrus heat damage, including the following aspects of management:

- Soil management. The emphasis is on deepening the soil layer and increasing the content of organic matter in the soil. It can also be covered with tree trays. When the temperature is higher than 30°C, the uncovered production trees are covered. The implementation of the whole garden grass cultivation from March to September will also help reduce heat damage.

- Fertilizer management. One is to re-apply precipitating fertilizer. When the spring buds begin to germinate in early March, fertilizers based on available nitrogen fertilizers are re-applied to meet the needs of tree shoots, flowering and fruit setting. The second is to increase the application of phosphorus and potassium fertilizer, spraying the phosphorus and potassium fertilizers on the leaves frequently in the spring, which has obvious effect on preventing heat damage and reducing abnormal fruit drop.

- Water management. Watering in time to keep the soil moist can reduce heat damage, and the spray water is better than irrigation.

- Branch management. The first is to protect the overwintering leaves. Put autumn shoots and apply urea or diluted manure water after fruit harvesting to increase tree vigor. Protecting the leaves can also spray 2,4-D solution with a concentration of 10 mg/kg to protect the leaves for the winter. The second is to reapply spring shoots and reduce the amount of new leaves. Spring shooter wipes, rewipes, and wipes as early as possible: Early wipe starts from the bud and re-wipes the new spring and the old leaves, erasing the excess spring shoots, and removing the spring shoots after 70% of the spring shoots. The summer shoots are used to make up for the lack of tree leaves, that is, to wipe the shoots several times in batches. Generally, they are wiped every 7 to 10 days until the end of the second physiological fruit drop. It is also possible to erase all late spring shoots and early blooms after the late flowering period. Summer shoots, 30% to 50% of the spring shoots before the flowering period, 3~5 leaf toppings left on the spring shoots left.

--Pest Control. Do a good job in the prevention and control of buds, locusts, leaf nails, and anthrax, and protect the leaves and fruits.

5. Emergency measures

——spraying flower and fruit protection agent. Use synergistic liquefaction of cytokinin (BA) + gibberellin (GA, coated fruit type) or synergistic liquefied gibberellin + gibberellin (spray type). Coated fruit type (10 ml) per bottle (10 ml) plus 0.5-1 kg of water (0.6-0.75 kg of orange adult tree water, 0.75-1 kg of young trees, and 0.75-1 kg of water added to Wenzhou mandarin). Mix well and dilute the solution. . After 5 to 10 days after the citrus flower is cut, the whole fruit surface of the young fruit is coated with a brush pen dilute solution, and the fruit can be wetted. Generally, the amount of fruit is sufficient when the fruit is coated once. For some plants that grow weakly or are vegetatively prosperous and are prone to fruit drop, they can be applied again at the beginning of the second physiological fruit drop. Spray the bottle (10 ml) and add 10~15 kg of water and stir it well to make a dilution. When 70%~80% of the flowers are cut in the citrus, use the sprayer to spray the young fruit of the crown. Spray the fruit, leaves and Spray as little as possible on the new shoot. 10 to 25 days after the first spray, spray again. For varieties or plants that are susceptible to fruit drop, they can be sprayed for the third time 30 to 40 days after flowering, and rain within 12 hours after spraying. They should be fine. Spray 1 time. The use of a micro-sprayer (with a mosquito-killer or other miniature sprayer aimed at flowering, young fruit spray) is more effective. The micro-sprayer adds about 5 kg of water to each bottle. Pulps should be tested in small areas before spraying to ensure safety. The mandarin orange of Wenzhou can also be used as its special fruit preserver - Baogan Ling. Usage: Each package Polan Ling powder plus 50% to 70% alcohol or liquor 25 to 50 grams, stir dissolved, add water 25 kilograms spray canopy, spray the end of full flower spray for the first time, 15 to 25 days after heavy spray 1, Spray flowers and fruit are the main ingredients and can be moistened.

In addition, it can also be sprayed gibberellin 10 mg / kg +0.4% ~ 0.5% potassium dihydrogen phosphate + 0.1% borax solution Xiehua 7 ~ 15 days after the spray gibberellin 30 ~ 40 mg / kg + cells Mitogen 800 times the second physiological fruit spray when spraying 10 mg / kg 2,4-D + 800 times Miu Bao to prevent the abnormal fruit drop in Wenzhou oranges. Paclobutrazol can also be used to protect the fruit, when the spring shoots 1.5 cm long when the spray growth inhibitor paclobutrazol (prescription effect is not ideal), 7 to 10 days before spraying again.

- Ringing ring cut. From the early flowering stage to the late flowering stage, the primary fruit tree or the large branch of the Prunus mume tree is cut or girdled.

- spray fungicide. The bactericide such as buprenorbuzine can be used to prevent mold infection before the rain, and it is also effective to shake off the residual flowers and raindrops after rain.

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