The invention discloses a bactericide composition. The bactericide composition contains pyrimethanil and berberine, for 1 part of pyrimethanil, the content of the berberine is 0.01-90 parts by weight. The invention further provides application of the bactericide composition in prevention and control of botrytis of cucumbers, tomatoes, strawberries, grapes, rieger begonia, cyclamen, cineraria, phalaenopsis, poinsettia pulcherrima, peony, China aster, camellia, chrysanthemums, begonia, dahlia, geranium and gladiolus. Through the adoption of the technical scheme, the bactericide composition has obviously enhanced prevention and control effect with respect to the pyrimethanil and berberine.