Knowledge of the application of biological pesticides on tea

What should be paid attention to when using biological pesticides on tea leaves, and which biological pesticides can be used on tea leaves. Today, Xiaobian and everyone share the knowledge about the application of biological pesticides on tea.

The current tea market, especially tea exports, places high demands on the quality and safety of tea. 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.

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 5-6 days, and only 2-3 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 roller moths, moths, moths, small green leaf mites, black thorn mites, and samovar, with 2.5% rotenone EC150-250mL per 667m2. Dilute with water to a 300-500 times spray. This pesticide cannot be mixed with alkaline pesticides. Rotenone is highly toxic to fish and should be used to prevent contamination of fish ponds.

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 the control of tea stalks in organic tea gardens. Before the 3rd instar larvae, use 3.2% insecticide net EC matrine alcohol, cypermethrin mixture 40-50mL per 667m2, add water 75kg, dilute to 1500-2000 times liquid spray, suitable for low Residual tea garden and green food tea garden. The organic tea garden can be sprayed with 800-1000 times of pure matrine preparation without chemical pesticides. The efficacy of matrine is slow and should be administered 3-5 days in advance.

Bacillus thuringiensis. The pest is mainly a stomach poisoning effect. After the insects feed into the digestive tract, the endotoxin and exotoxin of the parasporal crystal are produced, and the spore crystal is the main toxin. It usually takes 2-5 days after application to be effective. It has a good control effect on lepidopteran larvae such as tea caterpillars. Control lepidopteran larvae such as tea caterpillars, tea black moths, tea thorn moths, and use 10 billion live spores/g Bacillus thuringiensis WP or 10 billion spores/mL BtEC 75-150 g per 667 m2 in the 1st or 2nd instar larval stage. Dilute with water to a 500-1000 times spray. Suitable for use in organic tea gardens.

Beauveria bassiana. Beauveria bassiana is a fungal insecticide. The insecticidal effect is to contact the worm with spores. It is germinated under suitable conditions at a temperature of 24 ° C to 28 ° C, relative humidity of 90% to 95%, neutral or slightly acidic, and infested with insects. Body, mass reproduction, secretion of toxins, affecting the blood circulation of pests, interfere with the metabolism of pests, 3 to 7 days after the death of the worm, the body is covered with white hairy hyphae, also known as 'white zombie'. The tea leaf curler, tea caterpillar and small green leaf mites are used in the early stage of the first and second instar nymphs. Each 667m2 contains 0.5-70 million spores/g powder 0.5kg, 50L water is added, spray; A, in the peak period of cockroaches, each 667m2 of Beauveria bassiana per gram of broth containing 1-2kg of powder containing 5 to 7 billion spores, mixed into fine soil, applied to the rhizosphere soil of tea tree; When the adult is in its infancy, the powder is diluted with water and sprayed on the cloudy, rainy or early morning and evening.

Nuclear polyhedrosis virus. It is a kind of virus insecticide. The nuclear polyhedrosis virus has a cell-free structure and can only replicate and proliferate in the host to form a crystalline polygonal body. Insects are infected by mouth or wound. The virus enters the worm and is digested by gastric juice. The baculovirus particles are released, enter the body cavity through the intestinal epithelial cells, invade blood cells, fat and body cells, etc., and are embedded in the crystalline protein to form a multi-angle. Body, proliferate in the nucleus, and then infect healthy cells until the insects purgate and die. After the rupture of the diseased faeces and the corpse of the corpse, the polyhedron is released and spread widely by wind, rain, insects and birds, making the virus disease prevalent in the pest population. Mainly parasitic on Lepidoptera larvae. The nuclear polyhedrosis virus is slow in efficacy, but has a long-lasting effect of more than 2 years. In the first, fifth and sixth generation 1st and 2nd instar larvae, when the insect population density is lower than the control index, 19.2 billion PIB (protein crystalline polyhedrosis virus) tea scorpion nucleus polyhedron is used per 667m2. Virus AS50mL, spray 1000 times water. When the density of insects exceeds the control index, 50 liters of tea prion and chemical pesticides such as phoxim WP can be used, and water is added 1000 times.

Spray; control tea caterpillars, in the 1st and 2nd instar larval stage, use 100-50 billion PIB tea caterpillar nucleopolyhedrovirus AS50mL per 667m2, add water 1000 times spray. Or use 25-30 worms per 667m2, mash and spray on water.

Whitefly fungal preparations. It is a fungal insecticide that has good control effect on black thorns and white mites under humid conditions. Prevention and control of black thorns, mites, mites, in the 1st and 2nd instar larvae, under humid conditions, diluted with bacteria powder and water into a solution containing 0.1 billion spores per milliliter sprayed leaves, still need to spray wet branches. Since the black stimuli are mainly distributed in the tea tree and the back of the lower leaves, the back of the leaves should be sprayed when spraying. Under suitable conditions, the parasitic rate of the whitefly fungus is above 70%, and the effective period is 2-3 years.

The current tea market, especially tea exports, places high demands on the quality and safety of tea. 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.

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 5-6 days, and only 2-3 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 roller moths, moths, moths, small green leaf mites, black thorn mites, and samovar, with 2.5% rotenone EC150-250mL per 667m2. Dilute with water to a 300-500 times spray. This pesticide cannot be mixed with alkaline pesticides. Rotenone is highly toxic to fish and should be used to prevent contamination of fish ponds.

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 the control of tea stalks in organic tea gardens. Before the 3rd instar larvae, use 3.2% insecticide net EC matrine alcohol, cypermethrin mixture 40-50mL per 667m2, add water 75kg, dilute to 1500-2000 times liquid spray, suitable for low Residual tea garden and green food tea garden. The organic tea garden can be sprayed with 800-1000 times of pure matrine preparation without chemical pesticides. The efficacy of matrine is slow and should be administered 3-5 days in advance.

Bacillus thuringiensis. The pest is mainly a stomach poisoning effect. After the insects feed into the digestive tract, the endotoxin and exotoxin of the parasporal crystal are produced, and the spore crystal is the main toxin. It usually takes 2-5 days after application to be effective. It has a good control effect on lepidopteran larvae such as tea caterpillars. Control lepidopteran larvae such as tea caterpillars, tea black moths, tea thorn moths, and use 10 billion live spores/g Bacillus thuringiensis WP or 10 billion spores/mL BtEC 75-150 g per 667 m2 in the 1st or 2nd instar larval stage. Dilute with water to a 500-1000 times spray. Suitable for use in organic tea gardens.

Beauveria bassiana. Beauveria bassiana is a fungal insecticide. The insecticidal effect is to contact the worm with spores. It is germinated under suitable conditions at a temperature of 24 ° C to 28 ° C, relative humidity of 90% to 95%, neutral or slightly acidic, and infested with insects. Body, mass reproduction, secretion of toxins, affecting the blood circulation of pests, interfere with the metabolism of pests, 3 to 7 days after the death of the worm, the body is covered with white hairy hyphae, also known as 'white zombie'. The tea leaf curler, tea caterpillar and small green leaf mites are used in the early stage of the first and second instar nymphs. Each 667m2 contains 0.5-70 million spores/g powder 0.5kg, 50L water is added, spray; A, in the peak period of cockroaches, each 667m2 of Beauveria bassiana per gram of broth containing 1-2kg of powder containing 5 to 7 billion spores, mixed into fine soil, applied to the rhizosphere soil of tea tree; When the adult is in its infancy, the powder is diluted with water and sprayed on the cloudy, rainy or early morning and evening.

Nuclear polyhedrosis virus. It is a kind of virus insecticide. The nuclear polyhedrosis virus has a cell-free structure and can only replicate and proliferate in the host to form a crystalline polygonal body. Insects are infected by mouth or wound. The virus enters the worm and is digested by gastric juice. The baculovirus particles are released, enter the body cavity through the intestinal epithelial cells, invade blood cells, fat and body cells, etc., and are embedded in the crystalline protein to form a multi-angle. Body, proliferate in the nucleus, and then infect healthy cells until the insects purgate and die. After the rupture of the diseased faeces and the corpse of the corpse, the polyhedron is released and spread widely by wind, rain, insects and birds, making the virus disease prevalent in the pest population. Mainly parasitic on Lepidoptera larvae. The nuclear polyhedrosis virus is slow in efficacy, but has a long-lasting effect of more than 2 years. In the first, fifth and sixth generation 1st and 2nd instar larvae, when the insect population density is lower than the control index, 19.2 billion PIB (protein crystalline polyhedrosis virus) tea scorpion nucleus polyhedron is used per 667m2. Virus AS50mL, spray 1000 times water. When the density of insects exceeds the control index, 50 liters of tea prion and chemical pesticides such as phoxim WP can be used, and water is added 1000 times.

Spray; control tea caterpillars, in the 1st and 2nd instar larval stage, use 100-50 billion PIB tea caterpillar nucleopolyhedrovirus AS50mL per 667m2, add water 1000 times spray. Or use 25-30 worms per 667m2, mash and spray on water.

Whitefly fungal preparations. It is a fungal insecticide that has good control effect on black thorns and white mites under humid conditions. Prevention and control of black thorns, mites, mites, in the 1st and 2nd instar larvae, under humid conditions, diluted with bacteria powder and water into a solution containing 0.1 billion spores per milliliter sprayed leaves, still need to spray wet branches. Since the black stimuli are mainly distributed in the tea tree and the back of the lower leaves, the back of the leaves should be sprayed when spraying. Under suitable conditions, the parasitic rate of the whitefly fungus is above 70%, and the effective period is 2-3 years.

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