First report of Oidium citri in Bhutan

P. Holford; N. J. Donovan; Thinlay; E. Kabanoff; O. Wildman; S. Hardy; G. A. C. Beattie; Namgay Om; Dorjee; Phuntsho Wangdi

doi:10.1071/DN10020

RESEARCH ARTICLE

First report of Oidium citri in Bhutan

P. Holford ^A ^F , N. J. Donovan ^B , Thinlay ^C , E. Kabanoff ^A , O. Wildman ^A , S. Hardy ^D , G. A. C. Beattie ^A , Namgay Om ^C , Dorjee ^E and Phuntsho Wangdi ^E

+ Author Affiliations

- Author Affiliations

^A Centre for Plants and the Environment, University of Western Sydney, Locked Bag 1797, Penrith, South DC, NSW 1797, Australia.

^B Industry & Investment NSW, Elizabeth Macarthur Agricultural Institute, Private Mail Bag 8, Narellan, NSW 2567, Australia.

^C National Plant Protection Centre, Department of Agriculture, Ministry of Agriculture, Thimphu, Bhutan.

^D Industry & Investment NSW, Gosford Primary Industries Institute, Locked Bag 26, Gosford, NSW 2250, Australia.

^E Horticulture Division, Department of Agriculture, Ministry of Agriculture, PO Box 119, Thimphu, Bhutan.

^F Corresponding author. Email: p.holford@uws.edu.au

Australasian Plant Disease Notes 5(1) 55-57 https://doi.org/10.1071/DN10020
Submitted: 25 February 2010 Accepted: 11 May 2010 Published: 7 June 2010

Abstract

Powdery mildew is one of the most important diseases of citrus in Bhutan where it infects new flush growth causing leaf and shoot distortion and twig and branch dieback. It also attacks young fruitlets. This causes premature fruit drop. These symptoms, together with DNA sequence data and the production of single conidia and lobed appressoria, suggest that the disease is caused by Oidium citri (JM Yen) U. Braun. This is the first formal report of this pathogen in Bhutan.

Acknowledgements

We thank Michael Priest for his valuable taxonomic advice. This work was part-funded through a grant (Hort/2005/142) from the Australian Centre for International Agricultural Research.

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