The active ingredient of plant-derived insecticides is derived from plant bodies, and has the advantages of being environmentally friendly, generally low in toxicity, and resistant to pests in the control of crop pests. It is a pesticide species that should be preferred for the production of pollution-free agricultural products. In order to enable farmers and agricultural extension workers to have a comprehensive and profound understanding of plant-derived pesticides, the main plant-derived insecticides developed in China and their application in crop pest control are summarized. as follows. 1 commonly used species of plant-derived pesticides 1.1 matrine single agent has 0.2%, 0.26%, 0.3%, 0.36%, 0.5% water, 0.3% water emulsion, 0.36%, 0.38%, 1% soluble liquid, 0.3% EC, 0.38%, 1.1% Powder; mixed preparation with 1% matrine and azadirachtin emulsifiable concentrate, 0.2% matrine aqueous solution + 1.8% rotenone emulsifiable concentrate, 0.5%, 0.6%, 1.1%, 1.2% matrine and nicotine Agent, 0.6% matrine and berberine water. Can be used to control vegetable land small tiger, cruciferous vegetable cabbage caterpillar, diamondback moth, aphid, leek, cucumber red spider, aphid, tea tree tea caterpillar, tea ruler, tobacco tobacco budworm, haze, wheat, millet Sticky worm, cotton red spider, citrus scutellaria, pear tree scab, apple tree red spider, scutellaria, ring rot. 1.2 Oxymatrine single agent is 0.1% aqueous agent; mixed preparation has 0.5%, 0.6% oxymatrine·bone lactone aqueous solution. It can be used to control flower mites and vegetable cabbage worms and mites. 1.3 Nicotine single agent is 10% emulsifiable concentrate, mixed preparation has 0.84%, 1.3% strychnine · nicotine water, 2.7% strontium · nicotine suspending agent, 27.5% nicotine · oleic acid emulsifiable concentrate, 10% Pyrethrin·nicotine emulsifiable concentrate, 9% capsaicin·nicotine microemulsion, 15% ricinoleic acid·nicotine emulsifiable concentrate. Can be used for the control of cruciferous vegetables, cabbage caterpillars, aphids, citrus stalks, wheat aphids, armyworms, apple scutellaria, cucumber red spiders, locusts, kidney bean mites, cotton bollworm, locusts, tobacco budworms, mustard greens aphid. 1.4 Rotenone single agent has 2.5%, 4%, 7.5% emulsifiable concentrate, and the mixed preparation has 5% pyrethrin and rotenone emulsifiable concentrate. It can be used to control vegetable cabbage worm, aphid, diamondback moth, Spodoptera litura, citrus scutellaria, cotton bollworm. 1.5 Norozyme-III preparation is 0.1% emulsifiable concentrate, which can be used to control cabbage worms of cruciferous vegetables. 1.6 The blood root alkali is one of the main active ingredients in the extract of the Papaveraceae plant, and the preparation is one of the main active ingredients in the total alkaloids. The preparation is 1% blood root alkali wettable powder (5% brominated bio-alkali) Wettable powder). The medicine has certain control effect on the cruciferous vegetable cabbage caterpillar, the cardamom, the apple jaundice, the two-spotted spider mites, and the pear tree hibiscus. The control dosage of cabbage caterpillar and aphid is 1~ WP 30~50g/667m2, and the control effect of Phytophthora in the young larvae is best. The concentration of control apple locust and Dioscorea opposita Thunb. 1500~2500 times of liquid, generally in the nymphs of P. sylvestris and P. sylvestris. The drug has a quick-acting effect. Generally, the control effect is obviously increased after 3 days, and the effect period is about 7 days, which is safe for crops. 1.7 eucalyptus preparation is a 5% soluble liquid agent, which can be used to control cruciferous vegetable aphids. 1.8 The celangulin is an active ingredient extracted from the root bark and seeds of the wild shrub plant of the genus Euonymus, and the preparation is 1% celangulin emulsifiable concentrate. The drug has strong stomach toxicity, antifeedant, repellent, and contact killing effects, and has good control effect on the cruciferous vegetable cabbage caterpillar. The dosage of 667m2 is 50~70mL of 1% emulsifiable concentrate, generally diluted with water of 60~75kg, evenly sprayed. The drug has good quick-acting effect, and the control effect can reach more than 90% one day after the drug, and the effect period is more than 7 days, which is safe for crops. 1.9 Osthole osthole is an active ingredient extracted from the dried and mature fruit scorpion of the umbelliferous plant snake bed. The preparation is 0.4% osthole emulsifiable concentrate. It is mainly based on contact toxicity, supplemented by stomach toxicity, and has good control effect on cruciferous vegetable cabbage caterpillar and tea tree tea. The dosage of 667m2 for controlling cabbage caterpillar is 0.4% emulsifiable oil 80~120mL; the dosage of tea tree tea stalk is 0.4% emulsifiable concentrate 100~120mL, 50~75kg water is evenly sprayed, and the effective period is about 7 days, which is safe for crops. 1.10 The cucurbitacin preparation is a 0.5% soluble liquid agent, which can be used for controlling cotton bollworm, cotton aphid and cruciferous vegetable cabbage caterpillar. 1.11 alizarin preparation is 0.5% emulsifiable concentrate, which can be used to control cruciferous vegetable aphids. 1.12 Azadirachtin preparation is 0.3%, 0.5% emulsifiable concentrate, which can be used for controlling Plutella xylostella. 1.13 pyrethrin preparation is 5%, 6% emulsifiable concentrate, can be used to control cruciferous vegetable aphids. 1.14 Anisin preparation is 0.65% water, which can be used to control scales, aphids and cabbage caterpillars, aphids. 1.15 Hundreds of alkali preparations are 1.1% basal, alizarin and nicotine emulsifiable concentrates, which can be used for controlling larvae, larvae, and cruciferous vegetable aphids, cabbage caterpillars and diamondback moths. 1.16 eucalyptol is the main component of eucalyptus oil. The preparation is 5% eucalyptus solution, which has good control effect on cruciferous vegetable aphids. The dosage of 667m2 is 5% solution, 70~100mL, and evenly sprayed with 75kg of water. The effect period is about 7 days, which is safe for crops. 2 plant source pesticides advantages and disadvantages 2.1 Plant-derived insecticides have the following outstanding advantages: low environmental pollution; pests are more resistant to drug resistance; strong selectivity, low toxicity to humans, livestock and natural enemies, and relatively low development and use costs. 2.2 Plant-derived insecticides have the following outstanding disadvantages. 1 Most natural product compounds have complex structures, which are difficult to synthesize or synthesize too high; 2 active ingredients are easily decomposed, the preparation components are complex, and it is difficult to standardize; 3 most plant-derived pesticides play drugs Slow effect, some farmers believe that the pesticide used has no effect; 4 spraying more times, the residual period is short, not easy for farmers to accept; 5 due to the geographical distribution of plants, the restrictions on the choice of processing sites Many factors and plant collections are seasonal. The plant-derived insecticide is generally a water agent, which is easily decomposed by the action of sunlight or microorganisms, has a short half-life, and has rapid residue degradation, and is poorly enriched by the animal after feeding. Therefore, the large-scale use of plant-derived insecticides generally does not produce phytotoxicity, which in turn reduces the pollution of pesticides to the environment, and is a truly pollution-free pesticide. At the same time, plant-derived pesticides also have a nutritional effect on crops, which can improve the nutritional value of agricultural products. Name :marble Vinyl flooring (spc flooring,click spc flooring) Marble Grain Spc Flooring,Marble Grain Spc Floor,Marble Grain Spc Vinyl Plank,Marble Grain Spc Vinyl Plank Flooring JIANGSU PERFECT NEW MATERIAL TECHNOLOGY CO., LTD. , https://www.bffloor.com
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