In order to prepare efficient and stable tea polyphenols microemulsion and extend the action time of tea polyphenols, tea polyphenols play a better role in inhibiting the phytopathogenic fungus Magnaporthe grisea. Researchers from Suzhou Institute of Science and Technology Through the screening of cosolvent and emulsifier, the formulation of tea polyphenols microemulsion was determined, and the effects of water quality, storage conditions and pH value on the stability of microemulsion were studied. The effects of tea polyphenols microemulsion on Magnaporthe grisea Inhibitory effect.

           The results showed that, based on the quasi-ternary phase diagram analysis, acetone and PEG800 as the solubilizer and emulsifier of tea polyphenols, the microemulsion is the most stable and the best; different types of tea polyphenols have different mycelial growth of Magnaporthe grisea Degree of inhibition, tea polyphenols microemulsion> tea polyphenols acetone solvent> tea polyphenol aqueous solution; of which the best inhibitory effect of tea polyphenols microemulsion on mycelial growth inhibition rate of 81%. The results showed that it is very important to choose suitable emulsifier, solvent type and dosage. Tea polyphenols micro-emulsion has a good inhibitory effect on Magnaporthe grisea.

           The above results provide a reference for the development of plant-derived pesticide microemulsion.