The present invention relates to farm chemical and especially plant pesticide clathrate and its preparation process. Through coprecipitation or solid phase reaction process, elliptone and cyclodextrin or its derivative are produced into clathrate, in which elliptone inside the cavity of cyclodextrin is protected by cylcodextrin with sterically hindered and copmlexing effect and thus has decreased degradation rate and stable pesticide effect. At the same time, the hydroxyl radicals outside the cyclodextrin cavity is favorable to raising the dissolvability of elliptone in water. The clathrate of elliptone in water. The clathrate of elliptone inside cyclodextrin or its derivative has obvious pine nematode killing effect. |