Research On Formulation And Biological Activity Of 70% Imidacloprid Water Dispersing Granule

In this thesis, 70% imidacloprid water dispersible granule formulation and its quality testing methods as well as their toxicity to aphid (Lipaphis erysimi) was studied.Then the composition and propotion of various ingredients of 70% imidacloprid water dispersible granule was identified, the biological activity of this formula was determined by way of indoor toxicities. The results were as follows:We ultimately determine the 70% imidacloprid WG composition and content by screening on wetting agent, dispersing agent, binder, disintegrating agents and other assistants as well as carriers.The formulation was as follows: imidacloprid ammonium technical(72.9%), wetting agent-20(2.5%), dispersant agent-25 or dispersant agent-30 (5%),disintegrating agents(NH4)2SO4(3%), polyethylene glycol as a binder(2%)and carrier(carrier3: kaolin = 1:4) (14.6%).Through the research on quality detection method of the formulation,we make sure the active ingredient content of the formula preparation was 71.15%,suspension rate was 90.45%.Heat storage test results showed that the active ingredient content decomposition rate after heat storage is 1.28%,less than 1.5% and ,suspension rate was more than 90%.All of above indicated that the preparation has good heat storage stability.The indoor toxicity test of four imidacloprid formulations(10% imidacloprid WP,imidacloprid WG Admire,70% imidacloprid WG made by ourselves,70% imidacloprid WG with synergist) against Lipaphis erysimi showed that the biological activity of 70% imidacloprid WG made by ourselves is not much too different with commercial10% imidacloprid WP and imidacloprid WG Admire. And the efficacy was greatly increased after adding synergist to the70% imidacloprid WG made by ourselves. All of the four different imidacloprid formulations have a strong insecticidal action on aphids, their median lethal concentrations were 1.848 mg/L, 1.818 mg/L, 1.934 mg/L, 0.307 mg/L.