文献类型： 外文期刊
作者： Yang, Xiaojun 1 ; Yang, Lijun 2 ; Wang, Shaonan 2 ; Yu, Dazhao 2 ; Ni, Hanwen 2 ;
作者机构： 1.China Agr Univ, Agron & Biotechnol Coll, Beijing 10094, Peoples R China
2.China Agr Univ, Agron & Biotechnol Coll, Beijing 10094, Peoples R China; Hubei Acad Agr Sci, Inst Plant Protect & Soil Sci, Wuhan 430064, Peoples R China
期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.845； 五年影响因子：4.674 ）
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收录情况： SCI
摘要： The extract of the plant Rheum officinale Baill, mainly containing the anthraquinones physcion and chrysophanol, is highly active against plant powdery mildew. Experiments were conducted in the laboratory and greenhouse to determine the interaction of the two compounds on cucumber powdery mildew [Sphaerotheca fuliginea (Schlecht.) Poll] and on wheat powdery mildew [Blumeria graminis (DC.) Speer f. sp. tritici Marchal]. Physcion was much more bioactive than chrysophanol against these powdery mildews. There was a significant synergistic interaction between the two compounds on the diseases when the ratios of physcion to chrysophanol ranged from 1:9 to 5:5. The synergistic degree increased with increase in the chrysophanol proportion in the combination. The findings indicate that, in order to ensure constant efficacy of the extract on the disease, both the contents and the proportion of the main active ingredients physcion and chrysophanol have to be determined.
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