First report of powdery mildew caused by Golovinomyces sp. (Euoidium sp.) on the exotic ornamental plant Solidago canadensis (Asterales: Asteraceae) in India


Sachin V. Thite 1 & Basavaraj A. Kore 2


1,2 Department of Botany, Yashvantrao Chavan Institute of Science, Satara, Maharashtra 415001, India

1 (corresponding author), 2




Editor: Uwe Braun, Martin-Luther-Universität, Neuwerk, Germany. Date of publication: 26 November 2014 (online & print)


Manuscript details: Ms # o3937 | Received 05 February 2014 | Final received 04 November 2014 | Finally accepted 11 November 2014


Citation: Thite, S.V. & B.A. Kore (2014). First report of powdery mildew caused by Golovinomyces sp. (Euoidium sp.) on the exotic ornamental plant Solidago canadensis (Asterales: Asteraceae) in India. Journal of Threatened Taxa 6(12): 6590–6592;


Copyright: © Thite & Kore 2014. Creative Commons Attribution 4.0 International License. JoTT allows unrestricted use of this article in any medium, reproduction and distribution by providing adequate credit to the authors and the source of publication.


Funding: None.


Competing Interest: The authors declare no competing interests


Acknowledgements: The authors would like to thank Prof. Dr. Uwe Braun for providing the literature. Thanks are also due to Yogesh Chavan and Sharad Kambale for providing the technical assistance. Thanks are also due to Prof. P.R. Patil HOD Department of Botany and Dr. N.S. Gaikwad Principal Y.C.I.S. Satara.






Solidago canadensis L., (Image 1a) commonly known as Goldenrod, after its inflorescence, is a herbaceous perennial ornamental plant belonging to the family Asteraceae. The plant is exotic to India and was introduced for its ornamental value from North America. This plant has replaced traditional indigenous ornamental plants and is widely naturalized in Indian gardens. It is an erect, robust perennial herb with slender leafy stems pubescent below the inflorescence, growing from long creeping rhizomes (5–12 cm long) that can form rosette leaves. Leaves are lanceolate, acuminate, serrate, 4–7 cm long, three-nerved, rough, hairy, lowest leaves small and soon fall off, numerous small yellow flower heads appear in narrow or broadly pyramidal terminal clusters on inflorescence axis in ascending order. It is often cultivated as an ornamental plant for its golden yellow attractive inflorescence that is largely used in bouquets. The flower clusters can be used to make a strong yellow dye (Royer & Dickinson 1996).

In September 2013, during a routine survey in the Botanical Garden of the Yashvantrao Chavan Institute of Science, plants of S. canadensis were found to be infected with powdery mildew (Image 1b). Voucher specimens were deposited in the mycological herbarium at the Agharkar Research Institute, Pune (M.S.), India, with Accession No. AMH-9614. The fungal material was mounted in lactophenol, stained with cotton blue and microscopically examined.






The sexual morph (chasmothecia) of this powdery mildew was not found. The asexual morph is characterized as follows: Mycelium amphigenous, in white patches, persistent, hyphae thin-walled, smooth, hyaline, hyphal appressoria solitary, nipple-shaped (Image 1f), conidiophores arising from the upper surface of hyphal mother cells, erect, foot-cells subcylindrical, straight (56±5 × 10±2 µm), followed by 1–3 shorter cells and 3-4 conidia in chains formed in basipetal succession (Image 1c), catenescent, edge line sinuate, doliiform (28±4 × 14±6 µm), lacking fibrosin bodies (Image 1d). Germ tube terminal or subterminal, 45±8 µm long (Image 1e). Based on the combination of these features this pathogen is readily identifiable as an asexual morph (Euoidium Y.S. Paul & J.N. Kapoor) of the genus Golovinomyces (U. Braun) Heluta. A survey of Indian powdery mildew literature (Bilgrami et al. 1991, Jamaluddin et al. 2004; Paul & Thakur 2006; Pande 2008; Hosagoudar & Agarwal 2009) shows that no powdery mildew has been so far reported on S. canadensis from India. Powdery mildew on S. candensis is common and widespread in North America and Europe and was previously subsumed under Erysiphe cichoracearum DC. s. lat. [now Golovoniomyces cichoracearum (DC.) Heluta] (Braun 1987). Braun & Cook (2012) revised the taxonomy of the G. cichoracearum complex and assigned the powdery mildew on various species of Solidago to Golovinomyces asterum var. solidaginis. However, the Indian collection is morphologically not in agreement with the latter variety, which is well characterized by having conidiophores with foot-cells distinctly curved at the base and larger conidia, 25–40(-50) × (12-)14–22 µm, width on average >15 µm (Braun & Cook 2012). Therefore, the Indian powdery mildew can currently only be referred to as Golovinomyces sp. (Euoidium sp.). Identifications of isolated powdery mildew anamorphs are difficult and mostly impossible. Molecular sequence analyses are necessary and helpful for identification purposes.


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