山楂Cratataegus pinnatifida Bge. var. major N. E. Br.是一味常用中药。以果入药。在栽培山楂过程中病虫害种类繁多,直接影响山楂生产的发展。为此我们于1989～1991年在山楂生产地河北省兴隆县及本所药物园对山楂病虫害进行定点定期调查和研究,并采集标本进行鉴定,现将调查研究的初步结果整理报道如下。
Effect of essential oil from Asarum heterotropoides Fr.Schmidt var.mandshuricum(Maxim.)Kitag on hypha growth of sixteen plant pathogenic fungi was tested at concentration of 500 μg/mL.The inhibition rates to fourteen plant pathogenic fungi were above 50%,which showed the essential oil had broad-spectrum antifungal activity.According to the toxicity curve of essential oil to Alternaria humicola,the EC50 to mycelium growth and spores germination were 326.86 μg/mL and 406.24 μg/mL respectively.Furthermore,the effect of essential oil on cell membrane potential of A.humicola was tested by the conductivity method.The results showed the action of essential oil was changing osmosis of cell membrane of fungi.
