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- Title
石河子市区大花金鸡菊白粉病病原鉴定及发病规律.
- Authors
海艳; 李妍; 方治豪; 王凯涛; 任毓忠
- Abstract
【Objective】 To identify the pathogenic species and explore dynamic epidemic of Coreopsis grandiflora powdery mildew in Shihezi area. 【Method】 Morphological and molecular approaches were adopted to identify the pathogen of Coreopsis grandiflora powdery mildew, and dynamic of disease epidemic was systematically surveyed. 【Result】 The results showed that the conidiophores were up-right and producing 2-4 conidia in chains. Conidia were 24.4-34.2 μm×14.6-22.0 μm, Chasmothecia were dark brown, spherical, 115.1 ( 96.3-139.0)μm in diameter. Chasmothecium contained one asci with eight ascospores. Asci were sessile, broadly ellipsoid-ovoid to subglobose,68.3-131.7 μm×56.1-80.5 μm. Ascospores were 14.6-26.8 μm×12.2-21.7 μm. Appendages were mycelioid. The internal transcribed spacer (ITS) region of rDNA of the fungus was amplified and sequenced. The resultant 563 BP sequence was produced. A GenBank BLAST search of the China and Korea isolates showed above 99.0% similarity with Podosphaera fusca (Accession numbers are: KM225763, JX546297, KR049083 and MF476989) . 【Conclusion 】 Therefore, the pathogen causing powdery mildew of Coreopsis grandiflora was identified as Podosphaera fusca. The disease began in the middle of April, reached its peak in late June, and began to decline in early July in Shihezi of Xinjiang.
- Publication
Xinjiang Agricultural Sciences, 2019, Vol 56, Issue 11, p2072
- ISSN
1001-4330
- Publication type
Article
- DOI
10.6048/j.issn.1001-4330.2019.11.013