The invention discloses a gingko
snail killing
microemulsion agent and a preparing method, which relates to the technical field of
plant source agricultural
drug production. The invention takes the seed shell extract of the gingko containing a ginkgoic acid as the source
drug, and the invention is made by configuring auxiliary
surface active agents, solution agent and
antifreeze agent as well as water. The producing method comprises the following operating steps: the gingko external seed shell extract, the
microemulsion agent and the solution agent are blended to be an even and transparent
oil phase; the steamed water or the deionized water are added slowly to form an oil enclosed water type
emulsion during the agitating process; through agitating and heating, the
emulsion is rapidly converted into a water enclosed
oil type; a steady O or W type
emulsion after being cooled to reach the constant indoor temperature is obtained. The invention has fine environmental compatibility of the emulsion conformation, also completely realizes the advantages of the gingko
snail killing agent with high efficiency to the
snail and safety to people and animals. The
microemulsion agent takes water as the main
solvent with slight influence to environment. In addition, the invention has remarkable synergism; the LC 50 and LC 90 of the 24h respectively are 0.56mg per
liter and 3.5mg per
liter, which are obviously better than that of the 24h snail killing effect (LC50 is equal to 1.35mg per
liter and the LC90 is equal to 3.85mg per liter) of the external seed shell extract of the original
drug.