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6. Identification of eight Berberisspecies from the Yunnan-Guizhou plateau as aecial hosts for Puccinia striiformisf. sp. tritici, the wheat stripe rust pathogen

Author

LI, Si-nan, CHEN, Wen, MA, Xin-yao, TIAN, Xia-xia, LIU, Yao, HUANG, Li-li, KANG, Zhen-sheng, and ZHAO, Jie

Abstract

Puccinia striiformisWestend. f. sp. triticiErikss. (Pst) infects wheat and causes stripe rust. The rust is heteroecious with wheat as the primary uredinial and telial host and barberry (Berberisspp.) as the alternate pycnial and aecial host. More than 40 Berberisspecies have been identified as alternate hosts for Pst, and most of these are Chinese Berberisspecies. However, little is known about Berberisspecies or their geographic distributions in the Yunnan-Guizhou plateau in southwestern China. The Yunnan-Guizhou plateau is considered to be an important and relatively independent region for the evolution of the wheat stripe rust pathogen in China because the entire disease cycle can be completed within the region. In this study, we conducted a survey of barberry plants in the Yunnan-Guizhou plateau and identified the eight Pst-susceptible Berberisspecies under controlled conditions, including B. julianae, B. tsienii, B. veitchii, B. wilsonae, B. wilsonaevar. guhtzunica, B. franchetiana, B. lepidifoliaand B. pruinosa. These species are reported here for the first time to serve as alternate hosts for the wheat stripe rust pathogen under controlled conditions.

Published
2021
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7. Effects of patchouli and wormwood oils on the bioassays and behaviors of Tetranychus cinnabarinus (Boisduval) (Acari: Tetranychidae).

Author

Cheng, Zuo-Hui, Duan, Hui-Juan, Zhu, Xiang-Run, Fan, Fang-Fang, Li, Rui, Li, Sheng-Cai, Ma, Xin-Yao, Zhang, En-Jia, Liu, Yu-Kun, and Wang, Jue-Ying

Subjects
FUMIGATION, TETRANYCHUS, WORMWOOD, SPIDER mites, ESSENTIAL oils, MITES, BIOLOGICAL assay, CHEMICAL composition of plants
Abstract

The fumigation bioassays, the oviposition inhibition and repellent bioassays of patchouli and wormwood oils to T. cinnabarinus were determined in the laboratory with the methods of fumigation and repellency. Ethovision XT6 was used to analyze the effects of two essential oils at sublethal dosages on the behaviors of T. cinnabarinus. Based on the results, compared with wormwood oil, the fumigation bioassay of patchouli oil was stronger against T. cinnabarinus. In a simultaneous fumigation experiment, the effects of patchouli oil on the inhibition of oviposition of T. cinnabarinus were significantly higher (P < 0.01) than those of wormwood oil at the tested dosages. When T. cinnabarinus was exposed to the two essential oils at LD10, LD20, and LD30, the spontaneous movement tracks of T. cinnabarinus changed significantly, with the highest mobility frequencies at LD10. Moreover, the effects of exposure to patchouli oil on the spontaneous movement abilities of T. cinnabarinus were greater than those on movements following exposure to wormwood oil. Thus, patchouli oil is a promising candidate as a green vegetable, botanical acaricide. [ABSTRACT FROM AUTHOR]

Published
2020
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