How do tea trees cope with rain, snow and cold weather? What are the measures to prevent frostbite?

Tea tree is one of the warm tree species, which has certain requirements on temperature and heat. Normal growth can be achieved at the temperature of 10~35℃. When the temperature is stable at 8~ 14 degrees, the overwintering buds begin to germinate. When the temperature drops below 15 degrees, the new buds will stop growing, and when the temperature drops below 10 degrees.

Therefore, it is very important for tea trees to prevent cold weather.

Six measures are generally taken to prevent freezing injury of tea trees:

1, the tea garden is covered with soil, miscellaneous fertilizers, weeds, etc. In order to raise the temperature of the whole tea garden, cover the whole tea garden with straw and miscellaneous fertilizer leaves. It can obviously improve the cold resistance of tea trees. Root cover thickness 10 cm and spatial cover thickness of 5 cm are beneficial to soil moisture conservation and try to avoid soil temperature falling below 0 degrees. Straw mulching can improve the low temperature resistance of soil and reduce the depth of frozen soil.

2. Smoking can prevent the low temperature effect caused by late spring cold. Look at the weather forecast to understand the weather. The late frost caused by cold wave is very harmful to tea trees, because tea buds are sprouting at this time, and some new buds have been pulled out, which greatly reduces the cold resistance. When the temperature drops to about two degrees, pay attention to the wind direction at night and smoke properly in the windward, which is beneficial to protect the tea garden and reduce frost.

3. Covering the tea garden with plastic film is beneficial to increase the ground temperature through illumination, thus preventing the tea garden from freezing injury.

Not only plastic film can be used, but also other thermal insulation materials and crop straws can be used. Can be removed after the temperature rises.

4. Post-treatment method of tea tree freezing injury: properly prune, properly prune the frozen branches, cultivate COVID-19, and prune according to the severity of freezing injury. The pruned wound can be coated with four waves of meishi sulfur mixture, or directly coated with fresh plant ash immediately after pruning.

For freeze-trimmed tea trees, it is best to leave a large functional leaf when picking tea leaves to help tea trees recover their tree potential.

5. Proper topdressing will affect the tree potential of tea trees after freezing injury caused by late frost. About 23 kg of urea, a quick-acting nitrogen fertilizer, can be topdressing per mu, and foliar fertilizers can be sprayed together, such as amino acid foliar fertilizer+Tianda 2 1 16+0.3% potassium dihydrogen phosphate aqueous solution+brassinolide, etc. , once a week, continuous spray 2-2 times.

6, prevention and control of pests and diseases, the resistance of tea trees is reduced after freezing injury, which is easy to cause some diseases, such as scale insects, aphids, anthracnose and so on. To control aphids, imidacloprid and beta-cypermethrin can be sprayed after secondary dilution.

The bactericide chlorothalonil wettable powder and 47% Galenon wettable powder can control tea anthracnose.

The best time to control the nymphs of scale insects is from the end of incubation period to the first instar. Abamectin and buprofezin can be sprayed twice every two weeks for prevention and treatment.

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