The use of chemical pesticides in tea plantations to prevent and treat diseases and insect pests is one of the important means to achieve high quality and high yield of tea. However, if it is used improperly, it can easily cause injury and affect the yield and quality. There are many reasons for the occurrence of phytotoxicity in tea gardens, such as improper selection of pesticides, excessive concentration of chemicals, excessive spraying volume, poor water quality (such as sewage or hard water, etc.), excessive application times, and inappropriate pesticide blending or No strict application according to operating procedures; if chemical pesticides are used under high temperature, high humidity and strong light conditions, it will easily induce large-scale phytotoxicity. Prevention of phytotoxicity should start from many aspects and take comprehensive preventive measures:
Strictly according to the index medication to minimize the number of medications, to avoid seeing the worm to rush to medication. For tea plants with insect population density and disease index exceeding the prevention and control index, such as 5% of buds attached to tea line pods or 20% of buds of pods, 7,000-9,000 tea worms per acre, and 10-15 lobules of tea green leafhoppers. At the head, pesticides can be used to control.
Spraying with the correct method of application is a common method. From high-volume spray to low-volume spray, not only improves control efficiency, but also reduces the occurrence of phytotoxicity; poisonous baits can be placed 3-4 centimeters from the hole where the ground pest is harmful. It is trapped and killed; plug hole is a kind of spraying method for preventing and killing the stem pests. After being dipped in dichlorvos with cotton balls, it is stuffed into the hole of insects to kill and kill insects. Under the root zone, it is applied under the soil, and it can be 100-150 times of aluminum diphosphorus. Or benomyl 1000 times Irrigation root and so on.
Scientific preparation of liquid medicine to accurately grasp the amount and concentration of liquid dosage cup volume, with the syringe pumping, can not easily fall medicine; powder according to the area of ​​the drug over the scale, packaged into small packets; WP, first modulated into a paste, Blended with mother liquor and diluted with water to ensure the quality of application. The liquid should be sent to the control site and prevent heavy spraying. Special attention should be paid to the use of pesticides under conditions of high temperature, high humidity and strong light. To be able to achieve both the rule and the rule, no rule can be ruled.
Pay attention to safety intervals such as using BT agent 300-500 times to control tea caterpillars, tea worms, tea black venom moth and tea leaf roller moth, safety interval of 3-5 days; with 0.2% matrine aqueous solution 1000-1500 times, Prevention of tea caterpillars, tea black venom moth, tea leaf roller moth, safety interval of 5 days; phoxim safety interval of 10 days. Pay attention to rotation drugs, each pesticide can only be used once in the tea-picking period. This will not only prevent pests from developing drug resistance but also reduce residue.
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