First report of Pythium root rot of chrysanthemum in Vietnam and control with metalaxyl drench

T. M. Luong; L. M. T. Huynh; H. M. T. Hoang; L. A. Tesoriero; L. W. Burgess; H. T. Phan; P. Davies

doi:10.1071/DN10019

RESEARCH ARTICLE

First report of Pythium root rot of chrysanthemum in Vietnam and control with metalaxyl drench

T. M. Luong ^A , L. M. T. Huynh ^A , H. M. T. Hoang ^B , L. A. Tesoriero ^C , L. W. Burgess ^D ^G , H. T. Phan ^E and P. Davies ^F

+ Author Affiliations

- Author Affiliations

^A Quang Nam Plant Protection Sub-Department, Tam Ky, Quang Nam, Vietnam.

^B TTHUE Plant Protection Sub-Department, Hue, Vietnam.

^C Elizabeth Macarthur Agricultural Institute, PMB 8, Camden, NSW 2570, Australia.

^D Faculty of Agriculture, Food and Natural Resources, The University of Sydney, NSW 2006, Australia.

^E National Institute of Medicinal Materials, 3B Quang Trung St., Hanoi, Vietnam.

^F Plant Breeding Institute, Faculty of Agriculture, Food and Natural Resources, The University of Sydney, Private Bag 2570, Camden, NSW 2570, Australia.

^G Corresponding author. Email: burgess.international@gmail.com

Australasian Plant Disease Notes 5(1) 51-54 https://doi.org/10.1071/DN10019
Submitted: 3 March 2010 Accepted: 10 May 2010 Published: 7 June 2010

Abstract

This is the first report of Pythium root rot of chrysanthemum, and the pathogen responsible, Pythium aphanidermatum, from Quang Nam and TT Hue Provinces in Vietnam. The typical symptoms included stunting, wilting, and necrosis of the main, lateral and feeder rootlets. A black necrotic lesion girdling the lower stem was present in some diseased plants. The root rot commonly caused death of diseased plants and affected plants at all growth stages. The pathogen was also isolated from transplants affected by root rot, and sampled directly from boxes transported from Dalat, Lam Dong Province, the source of most transplants used in Quang Nam. Metalaxyl was shown to provide effective control of Pythium root rot in a field trial when used to dip transplants before planting, and as a regular drench. Metalaxyl also provided effective control of the disease in commercial crops on the farm where the field was located.

Acknowledgements

The authors gratefully acknowledge financial support from the Australian Centre for International Agricultural Research (ACIAR) through CP/2002/115 – Diseases of crops in the central provinces of Vietnam: diagnosis, extension and control (2005–2008).

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