Inhibition of the extractions of Stemona tuberosa Lour and Sophora flavescans on some plant pathogenic germs

The inhibitions of the extractions of Stemona tuberosa Lour and Sophora flavescans and their mixture on some plant pathogenic germs were studied.The results indicate that the extractions and their mixture can inhibit Bipolaris oryzae, Rhizoctonia solani, Fusarium moniliforme, Alternaria brassicae,Xanthonomas compestris var. compestris, Erwinia carotovora var. carotovora and Ralstonia soslanacearum. The inhibiting-effects of the extractions get better when their concentrations rise. The minimum inhibition concentrations of the extractions and their mixture are under 0.5mg/mL. The extractions and their mixture can also inhibit the sprouting of Alternaria brassicae's spore. Compared with the simplex extractions, the inhibiting- effects of mixture on Bipolaris oryzae and Erwinia carotovora var. carotovora get better, but there are no obvious effects on Xanthonomas compestris var. compestris, Fusarium moniliforme, and Ralstonia soslanacearum.