Tea is a vast agricultural product in China. It is a major agricultural product for exporting foreign exchange. At present, the tea market, especially the tea export, has high requirements for the quality and safety of tea. Therefore, low-residue bio-pesticides should be used in the production process of tea to ensure the quality and safety of tea.
At present, “no pollution production†has been implemented in China's tea production; vigorously promoting and popularizing comprehensive treatment technologies for pests and diseases has greatly reduced the application of chemical pesticides in tea production; some stability and systemicity are prohibited in tea production. Pesticides (such as 666, etc.); advocate the use of low toxicity, high efficiency, low residue, low water solubility and easy to degrade pesticides and plant pesticides , microbial pesticides; establish a safe interval system for pesticides in tea production. Biological pesticides, including microbial pesticides and plant-derived pesticides, do not pose pollution to tea and the environment, have low toxicity to humans and animals, and do not constitute residual poisons. Therefore, they are suitable pesticides for producing green food tea. In the current production of Grade A green food tea, especially organic tea and AA grade green food tea, the use of the following biological pesticides is worth promoting.
Matrine. Also known as oxymatrine, it is an alkaloid preparation prepared by extracting the root of Chinese herbal medicine Sophora flavescens and fruit with an organic solvent such as ethanol. It is easily degraded in the environment and has almost no residue. Control tea black moth, tea caterpillar, in the 1st, 2nd instar larval stage, or egg hatching peak, use 0.2% matrine AS50~75mL per 667m2, add water 50~75L, dilute to 1000~1500 times liquid spray. It can be used in organic tea gardens to control tea mites. Before the 3rd instar larvae, 3.2% of insects are used to kill EC every 667m2.
Rotenone. Also known as Saito, it is a plant-derived insecticide with a long history of application. It is easy to decompose in the air, low in residual toxicity and environmentally friendly. It has contact and stomach toxicity to pests. It has a wide spectrum of insecticides and a short duration of action, generally 5 to 6 days, and only 2 to 3 days in summer daylight. It can be used for the production of A-grade green tea, and it can be used to control tea mites, tea caterpillars, tea silkworms, leaf moths, moths, hawk moths, small green leaf mites, black thorn mites, and samovar, with 2.5% rotenone EC150~250mL per 667m2. Dilute with water to 300~500 times liquid spray. The China Pesticide Network reminds everyone that the pesticide cannot be mixed with alkaline pesticides. Rotenone is highly toxic to fish and should be used to prevent contamination of fish ponds.
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