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 There is no strict application according to the operating procedures; if chemical pesticides are used under high temperature, high humidity, and strong light conditions, they can easily induce large-scale phytotoxicity; in addition, tea plants have very high resistance and drug resistance at different fertility stages. Large differences, if you can not adjust the amount of medication and the number of applications, but also prone to phytotoxicity.
Prevention of phytotoxicity should start from many aspects and take comprehensive preventive measures:
In strict accordance with the indicators medication. Try to reduce the number of medications and avoid rushing to see the disease. 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.
The use of highly toxic and high residue pesticides such as methamidophos, methyl parathion, imidophos, dicofol and fenvalerate is strictly prohibited.
Use the correct method of application. Spraying is a common method, from high-volume spray to low-volume spray, not only improve the control efficiency, but also reduce the occurrence of phytotoxicity; poison baits can be placed in the 3-4 cm hole in the ground of harmful insect pests, trapping and killing; The hole is a method of spraying pesticides to prevent stem borer pests. It can be used to infiltrate dichlorvos with cotton balls and put into insect holes to kill insect pests. Under the root zone, pesticides can be applied 100-150 times of aluminum phosphate or benomyl 1000 Irrigation and other times.
Scientific preparation of liquid medicine. Accurately understand the amount and concentration of the drug, the amount of liquid to be used in the cup, with a syringe pumping, can not easily fall medicine; powder according to the area of ​​the drug over the scale, packaged into small packets; wettable powder, first modulated into a paste, dubbed mother liquor, Diluted with water to ensure the quality of the 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 the safety interval. Such as using BT preparations 300-500 times liquid tea caterpillars, tea feet, tea black venom moth and leaf roller moth, safety interval 3-5 days; with 0.2% matrine aqueous solution 1000-1500 times, control tea caterpillar, Tea black poison moth, tea leaf roller moth, safety interval 5 days; phoxim safety interval 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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