Viruses (2022) 14 (11 - 2366)

Mame Boucar Diouf, Sébastien Guyader, Olyvia Gaspard, Eric Francius, Pierre-Yves Teycheney and Marie Umber (2022)
Epidemiology of yam viruses in Guadeloupe: Role of cropping practices and seed-tuber supply
Viruses 14 (11 - 2366)
Abstract: The epidemiology of yam viruses remains largely unexplored. We present a large-scale epidemiological study of yam viruses in Guadeloupe based on the analysis of 1124 leaf samples collected from yams and weeds. We addressed the prevalence of cucumber mosaic virus (CMV), Cordyline virus 1 (CoV1), Dioscorea mosaic associated virus (DMaV), yam asymptomatic virus 1 (YaV1), yam mosaic virus (YMV), yam mild mosaic virus (YMMV), badnaviruses, macluraviruses and potexviruses, and the key epidemiological drivers of these viruses. We provide evidence that several weeds are reservoirs of YMMV and that YMMV isolates infecting weeds cluster together with those infecting yams, pointing to the role of weeds in the epidemiology of YMMV. We report the occurrence of yam chlorotic necrosis virus (YCNV) in Guadeloupe, the introduction of YMMV isolates through the importation of yam tubers, and the absence of vertical transmission of YaV1. We identified specific effects on some cropping practices, such as weed management and the use of chemical pesticides, on the occurrence of a few viruses, but no crop-related factor had a strong or general effect on the overall epidemiology of the targeted viruses. Overall, our work provides insights into the epidemiology of yam viruses that will help design more efficient control strategies.
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Full text of article
Database assignments for author(s): Sébastien Guyader, Pierre-Yves Teycheney

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Cucumber mosaic virus	Yam (Dioscorea)	Guadeloupe
	Yam mosaic virus	Yam (Dioscorea)	Guadeloupe
	Yam mild mosaic virus	Yam (Dioscorea)	Guadeloupe
	Sadwavirus dioscoreae	Yam (Dioscorea)	Guadeloupe