The invention discloses a
cynanchum komarovii germicide emulsifiable solution and a
microemulsion. The preparation includes
grinding the root, the stem, the leaf and the fruit of the
cynanchum komarovii; obtaining the
cynanchum komarovii extractive by concentrating the extracting solution into half weight of the
cynanchum komarovii grinding material after being extracted in
methanol; preparing the
cynanchum komarovii germicide emulsifiable solution with the extractive, the solution and
inert ingredient; adding water to the emulsifiable solution to obtain the
cynanchum komarovii germicide
microemulsion, wherein the concentration expressed in percentage by weight of the cynanchum komarovii extractive is 5%-50%. The germicide emulsifiable solution or the
microemulsion can effectively prevent and cure various
crop diseases including the rice
seedling blight, the wheat scab, the tomato and cucumber
botrytis cinerea, cotton
verticillium wilt, etc.; and has the advantages of
low toxicity, low residual, safety for human, animals, fish and birds, so that the germicide emulsifiable solution or the microemulsion is a non-
pollution ecological germicide and is applicable to the green
agriculture production.