Formulation Of 1% Azadirachtin Spreading Oil Based In Citronella And Application In Paddy Field

Study measured the diffusion on surface of the water of 22 kinds of plant essential oil,Nepeta oil,ginger oil,citronella oil,artemisia argyi oil and spearmint oil co uld keep a good state of spreading without precipitate,crystallization or layer-separation.And study measured the solubility of azadirachtin in the 5 kinds of plant essential oil.By screening in the nepeta oil,citronella oil,ginger oil,the three kinds of plant essential oil,study decided to formulation spreading oil(SO)of 1% azadirachtin with citronella oil last.Azadirachtin is a kind of extract oil from the neem tree terpene chemicals,has strongly rejected on insect feeding and hinder the growth and development.Azadirachtin of rice planthopper also has a certain refus feeds,poison,uptake and growth inhibition.This study had develop the formulation of 1% azadirachtin SO based in C itronella and application in paddy field.By comparing SO of emulsifiable concentrate(EC)of azadirachtin,calculated the spatial distribution and half-life of the two kinds of preparation on the riceThe color of 1% azadirachtin SO based in C itronella was Yellow transparent liquid.The formulation had been stored at 25 ?,(54±2?)or(0?)for 14-days without precipitate,crystallization or layer-separation.The decomposition rate was 8.5%,14.6% and 0.90% by HPLC.The spreading speed of 1% azadirachtin SO based in C itronella was 10.86cm/s and spreading area was 2142.21 cm2.The study measured the following result by HPLC,The half-life of azadirachtin was 8.57 ~18.08 h inside the rice plant,and 8.57 ~18.08 h inside water when 1% azadirachtin SO based in C itronella was applied in paddy field.The half-life of azadirachtin was 6.73~11.55 h inside the rice plant,and 11.23~11.31 h inside water when 0.3% azadirachtin EC was applied in paddy field.It showed that rice plant co uld adsorption 1% azadirachtin SO based in C itronella effective,thus azadirachtin wo uld control effect on rice planthoppe.The half-life of oxyfluorfen was 2.33~2.67 d inside the rice plant,0.53~0.59 d inside water,and 1.04~1.38 d inside the soil when 10% oxyfluorfen SO was applied in paddy field..The degradation rate of oxyfluorfen was fast,there was few residue in the environment.O xyfluorfen made no influence of azadirachtin distribution in paddy fields.After using 1% azadirachtin SO based in C itronella,the formulation spreaded on paddy water surface.The field efficacy showed that the correction control effect was 31.25% at the third day,72.55% at the seventh and 38.05% at the Fifteenth day.The data showed that the harm of planthopper has been completely controlled.