Plant Disease (2019) 103, 1507-1514

Daniel T. Dalton, Richard J. Hilton, Clive Kaiser, Kent M. Daane, Mysore R. Sudarshana, Julia Vo, Frank G. Zalom, Jessica Z. Buser and Vaughn M. Walton (2019)
Spatial associations of vines infected with Grapevine red blotch virus in Oregon vineyards
Plant Disease 103 (7), 1507-1514
Abstract: Spread and in-field spatial patterns of vines infected with grapevine red blotch virus (GRBV) were documented in Oregon vineyards using field sampling, molecular diagnostics, and spatial analysis. Grapevine petiole tissue collected from 2013 to 2016 was tested using quantitative polymerase chain reaction for GRBV. At Jacksonville in southern Oregon, 3.1% of vines were infected with GRBV in 2014, and GRBV incidence reached 58.5% of study vines by 2016. GRBV-infected plants and GRBV-uninfected plants were spatially aggregated at this site in 2015, and infected plants were spatially associated between years 2015 and 2016. In a southern Oregon vineyard near Talent, 10.4% of vines were infected with GRBV in 2014, and infection increased annually to 21.5% in 2016. At Talent, distribution of the infected vines was spatially associated across all years. GRBV infection was highest at Yamhill, in the Willamette Valley, where 31.7% of the tested vines had GRBV infection in 2014. By 2016, 59.2% of the vines tested positive for GRBV. Areas of aggregation increased and were spatially associated across all years. From 2013 to 2015, GRBV was not detected at Milton-Freewater in eastern Oregon. Spatial patterns of GRBV infection support evidence of spread by a mobile insect vector. GRBV is a significant threat to Oregon wine grape production because of its drastic year-over-year spread in affected vineyards.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Daniel T. Dalton, Kent M. Daane, Mysore R. Sudarshana, Frank G. Zalom, Vaughn Martin Walton

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
transmission/dispersal of plant diseases

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Grapevine red blotch virus	Grapevine (Vitis)	U.S.A. (NW)