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In recent years, Northwest Agriculture and Forestry University of Science and Technology, Institute of Pesticide active ingredients of the insecticidal plant Periploca (periploca sepium Bunge) and its insecticidal effect a more systematic study, In order to the further better direct the development and use of this valuable insecticidal plant resources, the paper Periploca methanol extract of the root bark for study materials, micro-emulsion and water emulsion processing research Periploca, as follows: 1. solvent system, cosurfactant system and emulsifier system screening formulated successfully the 10% Periploca microemulsion: 10% Periploca in concretes, 5? S-Ca (Nongru 500 #), 10% Nongru in # 400, 21% methanol, 12% of cyclohexanone, and the remaining water up to 100%. Technical indicators the: Periploca extract (content) 10% (W / W), wherein the main active ingredient Periploca new glycoside T content was 0.08%; appearance of a yellow, transparent, homogeneous liquid; pH range of 5-7; transparent temperature miscible with water may be an arbitrary ratio, the range of -5 ° C to -70 ° C; diluting liquid is a transparent, homogeneous liquid, no precipitation and suspension; repeated freezing of the formulation, at room temperature can restore itself as a transparent, homogeneous liquid; 54 ± 2 ° C. under the conditions to be stored for 14 days, The new glycosides T Periploca decomposition rate of less than 8%. The technical indicators are in line with the requirements of the commodity pesticides. 2 by the screening of the solvent system, the cosurfactant system and emulsifier system, successfully formulated 15% Periploca water emulsions: 15% Periploca in concretes, 4%, TX-5, 3% BY-140, @ 0 # 1, 27% methanol, 18% cyclohexyl ketone, and the rest water up to 100%. The technical indicators: Periploca, extract (content) 15% (W / W), the main-active ingredients Periploca new glycosides T content of 0.12%; appearance as a milky white liquid, standard hard water diluted 200 times, no oil slick precipitation. And water may be an arbitrary ratio miscible under the conditions of 54 ± 2 ° C, stored for 14 days, the new glycosides T Periploca exploded rate of less than 5% and less than 10% syneresis. The technical indicators are in line with the requirements of the commodity pesticides. 3. Establish a a microemulsion of Periploca water emulsion in the main active ingredient Periploca new glycoside T analysis method. Analysis of the 10% Periploca microemulsion PTLC-HPLC method: recoveries of 98.6 to 103.2%, the standard deviation of 0.0041, the coefficient of variation of 2.15%. Analysis: 15% Periploca water emulsion method recoveries of 96.6 to 100.1%, and the standard deviation of 0.0037, the coefficient of variation of 2.05%. Both comply with the requirements of constant analysis. Field experiments showed that 10% of micro-emulsion Periploca extract, and 15% water emulsion for the prevention and treatment of cabbage Pieris control efficiency up to 80%, 10% Periploca extract micro-emulsion diluted 200 times, diluted The control efficiency of up to 50 times more than 95%; the 15% Periploca extract water emulsion diluted 400-fold when the control efficiency of up to 80%, diluted 200 times when anti-efficiency more than 93%. Both have good promotional value in use.
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