植物提取液对黄瓜白粉病的抑菌活性筛选研究

首先通过叶圆盘法用29种植物提取液对黄瓜白粉病菌的抑菌效果进行了生物活性测定,初步筛选出槐、黄檀、南瓜和石楠等4种植物的提取液对黄瓜白粉病有较好的预防效果。然后对这4种植物提取液进行预防性和治疗性的室内盆栽药效试验,结果表明黄檀提取液对黄瓜白粉病的预防效果达到72.97%,治疗效果达到91.28%,并且在处理12 d后仍保持42.60%以上的防效。而槐提取液的预防效果和治疗效果分别为79.73%和79.19%,处理12 d后也保持在50%以上的防效。这两种植物提取液均极显著优于对照药剂三唑酮。

Study on Inhibition Effects of Plant Extracts against Cucumber Powdery Mildew

The preventive effects of 29 plant extracts against cucumber powdery mildew were tested with leaf disks method.The results showed that the extracts of Sophora japonica L.,Dalbergia hupeana Hance.,Cucurbita moschata Poiret,and Photinia serrulata Lindl.had a better preventive effect than the other extracts.The effects of these four plant extracts on potted plants in the cultural room were tested respectively.The results showed that the extract of D.hupeana had 72.97 % preventive effect and 91.28 % curative effect against cucumber powdery mildew.The extract of S.japonica had 79.73 % preventive effect and 79.19 % curative effect.Their protective effect against this pathogen both could maintain 12 days after the treatment.The two plant extralts'effects were much better than that of the Triadimefon,a traditional chemical pesticide for controlling this pathogen.