Inhibitory Effect of Ethanol Extracts from Different Medicinal Plants on Powdery Mildew of Rosa roxburghii
[Objective]It aimed to investigate the inhibitory effects of 10 common medicinal plant extracts(Syzygium aromaticum,Taraxacum mongolicum,Ginkgo biloba,Eriobotrya japonica,Glycyrrhiza uralensis,Zanthoxylum bungeanum,Houttuynia cordata,Cinnamomum cassia,Zingiber officinale and Rosa chinensis)on powdery mildew of Rosa roxburghii Tratt,which laid the foundation for developing plant fungicides to prevent powdery mildew.[Method]The inhibitory effect of ethanol extracts of 10 medicinal plants on powdery mildew at the concentration of 6 mg/mL was determined by spore germination method.The laboratory toxicity of three plant extracts with good antifungal effect was determined.[Result]6 mg/mL of 10 plant extracts had inhibitory effects on the germination of spores of powder mildew,with inhibition rates ranging from 8.58%to 86.00%,and S.aromaticum extract had the best inhibitory effect,with inhibition rate of 86.00%.The germination rates of powdery mildew respectively were 8.04%-23.27%,9.50%-20.23%and 9.21%-18.33%treated with different concentrations of S.aromaticum,T.mongolicum and E.japonica extracts.The inhibition rates were 9.38%to 68.69%,29.73%to 66.93%and 24.07%to 62.77%,respectively,and the inhibition rates increased with the increase of extract concentration.The EC50 values were 0.077 mg/mL,0.445 mg/mL and 0.617 mg/mL,respectively.The inhibitory effects on the germination of powdery mildew were S.aromaticum>T.mongolicum>E.japonica.[Conclusion]10 plant extracts have the inhibitory effect on powdery mildew.S.aromaticum extract has the best antifungal effect that can be used in the development and application of plant-derived fungicides for powdery mildew.
Rosa roxburghii Trattpowdery mildewplant extractanti-bacterial effectlaboratory toxicityspore germination method
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