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| Control Effect of Chinese Medicinal Herb Extracts on Powdery Mildew of Hullless Pumpkin |
| LI Fa-kang，LI Pei，LI Xing-yu，XUE Ying-yu* |
| College of Plant Protection，Gansu Agricultural University，Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province，Lanzhou 730070，Gansu，China |
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Abstract Taking the ethanol extracts of 5 Chinese herbal medicines，including Cnidium monnie，Perilla frutescens，Houttuynia cordata，Glycyrrhiza uralensis，Asarum heterotropoide as test material，this paper studied the protective and curative effects of ethanol extract on powdery mildew of Hull-less pumpkin by indoor pot cultivation test．The results showed that the tested 5 Chinese herbal extracts had certain protective and curative effects on Hull-less pumpkin powdery mildew，and the protective and curative effects of most Chinese herbal extracts at a concentration of 0.02 g · mL-1 were higher than the concentration of 0.01 g ·mL-1．Among them，the protective and curative effect of Cnidium monnie extract was the best．When the concentration was 0.02 g · mL-1，the protective and curative effects were 87.57% and 86.80%，respectively．The protective effects of 0.02 g · mL-1 Cnidium monnie，Asarum heterotropoide on Hull-less pumpkin powdery mildew were significantly better than that of 15% triadimefon WP by 1 000 times．The protective and curative effects of Glycyrrhiza uralensis were the worst．The 0.02 g · mL-1 extract of Cnidium monnie could be preferentially used as new type biological agents for controlling pumpkin powdery mildew．
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Received: 09 April 2019
Published: 23 June 2019
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