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Health with long-term use of chemical pesticides, resulting in health pest resistance gradually increased, and the potential impact on human health. Natural pyrethrin, essential oils and other plant-derived substances have readily biodegradable insecticide residue, human and animal safety, pest easy to produce drug resistance, do not pollute the living environment, etc., meet the requirements of people on health pesticides, has broad application prospects. In this paper, six kinds of plants and 12 species of plants essential oils extracts of natural pyrethrin synergies and conducted synergistic botanical material and natural pyrethrin synergistic formulation screening, on this basis, developed a preliminary A plant source of aerosol insecticide. Specific results are as follows: 1, using flask fumigation to housefly and Culex pipiens as test insects for natural wintergreen oil, cold pressed orange oil, distilled orange oil, lemon grass oil, eucalyptus oil, oil, six kinds of leaves essential oils fumigation activity screening, the results show that six kinds of essential oils against housefly and Culex have better fumigation activity. Which distilled orange oil, eucalyptus oil and lemon grass oil fumigation activity against housefly better, KT50 were 5.0 min or less; wintergreen oil, lemon grass oil and cold pressed orange oil on Culex fumigation better activity, KT50 were 6 .0 min or less. 6 kinds of essential oils, lemon grass oil housefly and Culex have good fumigation activity. 2, the use of micro-drip method, carried out six species of plants and 12 species of plants essential oil extracts of natural pyrethrin synergistic activity screening, the results show that six kinds of essential oils and extracts of H, C, and T extract extract has some synergistic effect. 6 kinds of essential oils, lemon grass oil synergistic effect is best, and with the natural pyrethrin preferred ratio of 8:1, efficiency factor of 1.567. 3, botanical insecticide aerosols (alcohol) for the development, determining the initial aerosol formulations in an amount of natural pyrethrin 0.5% Tween-80 emulsifier, the amount of 5.0%. 4, using 5.8 m3 cabin France, measured in aerosols, lemon grass oil and natural pyrethrin in 8:1 ratio coefficient of 1.383 under the synergistic; three kinds of plant extracts and natural pyrethrin 10:1 mixed, T extract the best efficiency, efficiency coefficient was 1.217, H and C extract extract synergistic coefficients were 1.126 and 1.202. 5, the efficiency of plant origin substances lemon grass oil, T extract natural pyrethrin compound, to obtain a synergistic botanical recipes, recipe consisting of: 0.5% Natural Pyrethrins 4.0% 5.0% Tween 80 5.0% T lemon grass oil extract, the solvent is ethanol. 6, according to the final resultant synergistic botanical formulation developed botanical insecticide aerosol QT, spray rate was 99.56%, the injection rate of 2.061g / s, product internal pressure 0.59MPa, pH of contents 6.95, are in line with national standards. Efficacy test results show that aerosol insecticide efficacy evaluation of QT meet health class B level. 28 m3 simulated field test, aerosol QT on Culex 1h knockdown rate of 72%, 24h mortality rate was 69%.
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