摘要： 采用小株子叶法测试了22种植物提取物对黄瓜白粉病菌的抑制作用。其中水蓼、川黄柏、连翘等8种植物提取物对黄瓜白粉病菌具有较好抑制作用,EC₅₀值均小于0.5%,除茵陈和马齿苋外,其他6种植物提取物对黄瓜白粉病的保护效果均高于治疗效果。8种植物提取物在1.25%浓度下对黄瓜白粉病的保护效果均高于化学药剂三唑酮100μg/mL(74.42%);1.25%的川黄柏、广藿香、马齿苋、蛇床子、南五味子提取物对黄瓜白粉病的治疗效果达到82%以上,高于三唑酮100μg/mL(78.89%),说明在黄瓜白粉病发生之前或初期使用这8种植物提取物能够达到较好的防治效果。

关键词: 植物提取物, 黄瓜白粉病菌, 抑菌作用, 保护效果, 治疗效果

Abstract: The inhibiting effects of extracts from 22 plant species to Sphaerotheca f uliginea were tested on cucumberseedlings with two cotyledons each.The results showed that extracts from 8 plant species were more inhibitory to S. fuligineathan the others, with EC₅₀ lower than 0. 5%. Among the 8 extracts, the preventive effects of 6 plant extracts exceptArtemisia capillaries and Portulaca oleracea were higher than their curative effects.The preventive effects of 1. 25%extractfrom the 8 plants were higher than that( 74. 42%) of 100 ??g/mL triadimefon. 1. 25% extract from Cortex phellodendri , P .cablin , Portulaca oleracea, Fructus cnidii and Kadsura japonic exhibited the curative effect of as high as 82% to S . fuliginea,higher than that( 78. 89%) of 100 ??g/ mL triadimefon. It indicated the 8 plant extracts can be used for effective controllingof cucumber powdery mildew at the initial stage of cucumber powdery mildew or before the disease occurs.

Key words: Plant extracts, Sphaerotheca fuliginea, Inhibit ion effects, Preventive effect, Curative effect

中图分类号: 

• S436.421