What are the integrated pest control techniques for pollution-free tea gardens?

1, adding early topdressing. Generally, the application time of accelerating germination fertilizer is 15-30 days before the tea tree germinates, that is, before the end of February, 25-30 kilograms of urea, 50-60 kilograms of ammonium bicarbonate or 50 kilograms of special compound fertilizer for tea trees are applied per mu. Fertilization should be applied in furrow, with the furrow depth of 10- 15cm, and the soil should be covered in time after fertilization. For tea gardens with too dense plants, if furrow application is not possible, throwing application can be adopted, but it must be carried out on cloudy days and before rain, so as to avoid burning tea leaves and causing fertilizer loss.

2. Shallow tillage and weeding. Weeding by shallow tillage before tea garden mining is beneficial to loosen soil, raise soil temperature, remove weeds, reduce water and nutrient consumption, and promote early germination in spring ploughing. Shallow tillage weeding should generally be carried out at the end of February and the beginning of March, with a depth of 5- 10 cm. At the same time, combined with cleaning the garden, weeds and fallen leaves will be converted into soil to reduce the population base.

3. Use light pruning skillfully. For tea gardens that have no freezing injury in winter and spring and need to pick famous and excellent tea, in order to pick more famous and excellent tea early, pruning should generally not be carried out before spring tea, but should be postponed as far as possible until the end of spring tea picking. For the tea garden to be pruned, it is best to finish it from the end of February to the time of surprise, and the depth of light pruning is generally 5-7 cm. For tea gardens damaged by freezing, light pruning should be carried out in time, and the pruning depth should be based on cutting off the branches damaged by freezing, which should be light rather than heavy, sooner rather than later. Put an antiseptic film on the trimmed mouth in time to protect the wound from rapid healing and isolate virus infection.

4. Prevent "cold spring" in time. In early spring, we should always pay attention to the weather forecast of the day and take measures to prevent "late spring cold" in advance: First, cover the tea garden, that is, cover the shed surface and the tea garden floor with straw, weeds and plastic film with sunshade net before the cold current comes, so as to promote the temperature rise of the tea garden and reduce the frost impact of the tea garden. The amount of grass spread per mu is more than 1500 kg, so it is advisable not to expose the ground. The tea garden is covered with the tree crown, and the cover will be removed in time after the cold wave. The second is to smoke and prevent freezing. Before the late frost comes, in the clear and rainy evening, the sod piles set at the edge of the inward and well-located tea garden are lit to spread the smoke, reduce the radiation and heat dissipation at night, and effectively prevent the harm of late frost to the tea garden. Third, keep the soil moist, strengthen the management of fertilizer cultivation in tea garden, apply sufficient base fertilizer, increase exotic soil, thicken the living soil layer, and establish a shelterbelt at the windward mouth of tea garden. For tea gardens where early-growing varieties have sprouted leaves, it is necessary to concentrate manpower on harvesting young leaves to reduce freezing damage losses. Fourth, the whole garden is sprayed with general tree protection liquid for disinfection and sterilization to protect trees from freezing injury.

5. Spray foliar fertilizer. In order to promote the early, frequent and strong development of spring tea, foliar fertilizer can be sprayed before the germination of tea trees in spring. Generally, 0.5- 1% urea, 0.2-0.3% potassium bicarbonate and multifunctional nutrient solution can be sprayed before and after 2-3 times with an interval of 5-7 days each time. In addition, spraying Zhuangganling can make the stems and leaves of plants stout, fresh and tender, the plants flourish and have a strong natural flavor. At the same time, it can improve the disaster resistance, reduce the dosage of pesticides and fertilizers, and reduce the residual poison.

6. Early mining. Tea bud is the raw material base for producing famous tea. When more than 5% of tea buds in the tea garden meet the standard of picking suitable products, they should be picked immediately, so as to pick them in time, in batches and early, promote the continuous germination of spring tea, increase the proportion of high-quality tea and improve the economic benefits of tea.