Suspension seed coating agent containing fipronil and imidacloprid and its preparation method and use

The invention discloses a suspension seed coating agent containing fipronil and imidacloprid and its preparation method and use. The suspension seed coating agent mainly comprises active ingredients, auxiliary agents and other accessory materials. The active ingredients comprise phenylpyrazole bactericide fipronil and nicotine-type super efficient bactericide imidacloprid. The suspension seed coating agent and seeds are mixed in use. The suspension seed coating agent can prevent underground insects such as leaf beetles, wireworms and cutworms and aboveground insects such as aphids in a seedling stage, and has the advantages of good film forming ability, uniform coating, high suspension rate, safety, low toxicity and high prevention effects. Low temperature, heat storage stability and freezing-thawing alternative tests prove that the suspension seed coating agent does not produce obvious layering, has good dispersibility in water and has all indexes satisfying seed coating agent related standards. A field pesticide effect test result shows that the suspension seed coating agent has good prevention effects on corn grubs.