A fungicidal composition containing a fungicidally effective amount of (a) the compound of Formula I, (3S, 6S, 7R, 8R) -8-benzyl-3-(3-((isobutyryloxy)methoxy)-4-methoxypicolinamido)-6-methyl-4, 9-diox o-1, 5-dioxonan-7-yl isobutyrate, and (b) fluxapyroxad, provides synergistic control of selected fungi.一種殺真菌組成物,其包含殺真菌有效量的(a)式I之化合物,異丁酸(3S,6S,7R,8R)-8-苄基-3-(3-((異丁醯基氧基)甲氧基)-4-甲氧基吡啶醯胺基)-6-甲基-4,9-二側氧-1,5-二喃-7-基酯;及(b)氟唑菌醯胺(fluxapyroxad);其提供所選擇的真菌之協同性控制。