The present invention, comprising [(3S,4R,4aR,6S,6aS,12R,12aS,12bS)-3-(cyclopropanecarbonyloxy)-6,12-dihydroxy-4,6a,12b-trimethyl-11-oxo-9-(pyridin-3-yl)-1,2,3,4,4a,5,6,6a,12a,12b-decahydro-11H,12H-benzo[f]pyrano[4,3-b]chromen-4-yl]methyl cyclopropanecarboxylate (compound I) and a pesticidal compound II; in syn-ergistic effective amounts.本發明包括協同有效量之環丙烷甲酸[(3S,4R,4aR,6S,6aS,12R,12aS,12bS)-3-(環丙烷羰基氧基)-6,12-二羥基-4,6a,12b-三甲基-11-側氧基-9-(吡啶-3-基)-1,2,3,4,4a,5,6,6a,12a,12b-十氫-11H,12H-苯并[f]吡喃并[4,3-b]烯-4-基]甲酯(化合物I)及農藥化合物II。