Distribution and Incidence of Iris yellow spot virus in Colorado and Its Relation to Onion Plant Population and Yield

Plant Disease
David H GentRajiv Khosla

Abstract

Iris yellow spot virus (IYSV) is an emerging and potentially devastating disease of onion that was recently detected in Colorado and other onion producing regions in the western United States. In annual surveys, IYSV was confirmed in one of 18 fields (5.6%) in 2001, four of 24 (16.7%) in 2002, and 41 of 56 (73.2%) in 2003. IYSV was confirmed on volunteer onions in 2003 at all four locations where IYSV was observed in the onion crop the previous year. The disease was detected in six of seven western Colorado onion fields surveyed in 2003, but was not observed any year in southern or northeastern Colorado. The spatial variability of disease incidence, yield, and plant population also was mapped in two fields in 2003 using the global positioning system and a geographic information system. Disease incidence varied among cultivars, plant population, fields, and location in the field. Distinct disease gradients were observed in both fields with susceptible cultivars Teton and Granero, but not in the moderately resistant cultivar Sterling. In fields planted to the susceptible cultivars, disease incidence was highest on the field edges and lowest near the field centers. Plant population was negatively correlated with IYSV incidence in ...Continue Reading

References

Mar 1, 1993·The Journal of General Virology·I WijkampD Peters
Feb 1, 2004·Plant Disease·L J du ToitG Q Pelter
May 1, 2002·Plant Disease·H F SchwartzD H Gent
Aug 1, 2001·Plant Disease·A KritzmanA Gera
Jul 1, 1998·Plant Disease·R D GitaitisR B Chalfant

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Citations

Jun 24, 2010·Journal of Economic Entomology·John Diaz-MontanoAnthony M Shelton
Jun 1, 2011·Plant Disease·Cynthia L HsuBrian A Nault
Dec 1, 2006·Plant Disease·David H GentHoward F Schwartz
Sep 7, 2017·Phytopathology·David H GentAlissa B Kriss
Feb 13, 2015·Virusdisease·E E HafezA A Abdelkhalek
Nov 1, 2013·Plant Disease·R IftikharH R Pappu
Mar 17, 2011·Journal of Economic Entomology·John Diaz-MontanoAnthony M Shelton
Dec 24, 2018·Frontiers in Plant Science·Alexander Mutua MuveaRainer Meyhöfer
Dec 6, 2014·Molecular Plant Pathology·Sudeep BagHanu R Pappu
Jan 15, 2021·Scientific Reports·David KottelenbergWopke van der Werf

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