Pollution-free control techniques of tea plant diseases and insect pests

At present, the main pests in tea garden are tea false eye small green leafhopper, tea orange gall mite, tea inchworm and so on; diseases include anthracnose, tea brown leaf spot and so on. Tea farmers should strengthen the investigation of tea gardens, do a good job in the prevention and control of diseases and insect pests in time, combine primary treatment with simultaneous treatment of many kinds of pests, select efficient and safe pollution-free pesticides and biological pesticides, mix them reasonably, and reduce the times of spraying to ensure the yield and quality of tea.

As the tea false-eyed small green leafhopper overwintered last winter and this spring, with the rise of temperature, the tea garden in the county has generally occurred, and the number of insects has increased rapidly since the middle of May. According to the survey of the station on June 14, the number of louvers reached 37, of which nymphs accounted for 89.2%. At present, it is about to enter the plum rain season, which is very beneficial to the growth and occurrence of the pest, and it is expected that the number of insects will continue to increase, which will have a certain impact on tea production in the future. Tea farmers should strengthen inter-garden investigation and harvest diligently in batches in production. it is an economical and effective method to control the pest by taking away a large number of eggs and young nymphs with bud leaves. For tea gardens with more than 6 louver worms, pesticide should be applied in sunny days, and 60 ml / mu of Lvlang EC can be used. According to Miao Gaozhuang Mountain Tea Farm, the use of Lulang EC 60ml / mu mixed with 50 kg of water spray, while spraying insects to death, the knockdown ability is particularly strong, three days after the medicine, the tea garden is pest-free, because Green Wave is a pure plant insecticide, no pollution, no drug resistance, for the county due to the long-term use of imidacloprid pesticides and can not control insect pests is a good choice.

Tea orange gall mite is a common harmful mite in tea garden in this county. Adult and juvenile mites absorb the sap of tender leaves, which makes the leaves lose luster and brown spots appear on the back of leaves, which has a serious effect on the yield, quality and tree potential of tea. According to the investigation of the agricultural plant protection department in the tea and fruit field of the county on June 14, the rate of mites leaves is 96.67%, with an average of 24.1 per leaf, and the highest leaf is 65. According to the actual situation of the local tea garden, combined with the prevention and control of pests such as false-eyed small green leafhopper, tea farmers should spray and control the tea garden with an average of 17 heads per leaf, and the method of application should be low-volume spray. The control of pesticides can choose 73% carotene EC 2000 times, and the safe interval for tea picking is 10 days (application should be avoided in the hot sun).

Tea farmers should pay close attention to the occurrence of other pests such as tea inchworm and control them in time. Green wave or Saidan can be used to control tea inchworm, and green wave or dichlorvos or Uranus can be used to control tea black moth. The safety interval was 7 days.

For tea gardens with tea brown leaf spot disease, anthracnose and other leaf diseases, 70% methyl topiramate 75 g / mu or 75% chlorothalonil 100 g / mu can be selected for control at the initial stage. The safety interval is 10 days.