<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The Okanagan Valley of British Columbia hosts a wine grape industry that has grown substantially in the past three decades in terms of both acreage and economic benefit to the region. The ring nematode, <italic>Mesocriconema xenoplax</italic>, has recently been found to be widespread in vineyard soils in the region. This study used field microplots to assess the potential impacts of a local population of <italic>M. xenoplax</italic> on the first four years growth of either self-rooted ‘Merlot’ or ‘Merlot’ vines grafted onto three commonly used rootstocks: 3309C, 44-53M, and Riparia Gloire. The population of <italic>M. xenoplax</italic> multiplied to comparable levels on self-rooted vines and all rootstocks, indicating that none of the vine genotypes were resistant to <italic>M. xenoplax</italic>. Inoculation with <italic>M. xenoplax</italic> reduced cumulative pruning weights of self-rooted vines by 58%. Inoculation with <italic>M. xenoplax</italic> reduced trunk cross-sectional areas of 3309C by 45% and that of self-rooted vines by 38%, whereas it did not affect trunk cross-sectional areas of 44-53 or Riparia Gloire, indicating differing levels of rootstock tolerance to <italic>M. xenoplax</italic>. Our data suggest that <italic>M. xenoplax</italic> is likely impacting vineyard health and productivity in the region, and the selection of rootstocks and management practices to minimize impacts of this nematode should be considered in future vineyard replant management programs.</p>
</abstract>

The Okanagan Valley of British Columbia hosts a wine grape industry that has grown substantially in the past three decades in terms of both acreage and economic benefit to the region. The ring nematode, Mesocriconema xenoplax, has recently been found to be widespread in vineyard soils in the region. This study used field microplots to assess the potential impacts of a local population of M. xenoplax on the first four years growth of either self-rooted ‘Merlot’ or ‘Merlot’ vines grafted onto three commonly used rootstocks: 3309C, 44-53M, and Riparia Gloire. The population of M. xenoplax multiplied to comparable levels on self-rooted vines and all rootstocks, indicating that none of the vine genotypes were resistant to M. xenoplax. Inoculation with M. xenoplax reduced cumulative pruning weights of self-rooted vines by 58%. Inoculation with M. xenoplax reduced trunk cross-sectional areas of 3309C by 45% and that of self-rooted vines by 38%, whereas it did not affect trunk cross-sectional areas of 44-53 or Riparia Gloire, indicating differing levels of rootstock tolerance to M. xenoplax. Our data suggest that M. xenoplax is likely impacting vineyard health and productivity in the region, and the selection of rootstocks and management practices to minimize impacts of this nematode should be considered in future vineyard replant management programs.

<article-title xml:lang="en">Potential impacts of the ring nematode, <italic>Mesocriconema xenoplax</italic>, on grapevines in British Columbia: a microplot study

Journal of Nematology

This work is licensed under the Creative Commons Attribution 4.0 International License.

Potential impacts of the ring nematode, , on grapevines in British Columbia: a microplot study

running-head

The Okanagan Valley of British Columbia hosts a wine grape industry that has grown substantially in the past three decades in terms of both acreage and...

Month, year	Maximum	Minimum	Mean
July, 2007	30.5	16.5	23.5
January, 2008	0.3	−6.6	−3.2
July, 2008	29.2	14.6	21.9
December, 2008	−2.2	−8.5	−5.4
July, 2009	31.1	15.5	23.3
December, 2009	−1.3	−6.5	−3.9
July, 2010	29.5	14.3	21.9
January, 2011	2.0	−4.3	−1.2
August, 2011	29.4	14.1	21.8

	Mx population density	2011 trunk cross-sectional area (mm²)		2008-2011 cumulative pruning weights (g dry weight/vine)		Total root biomass (g/kg dry soil)		Fine root biomass (g/kg dry soil)
Rootstock	Mx/L soil	−Mx	+Mx	−Mx	+Mx	−Mx	+Mx	−Mx	+Mx
44-53	3,559	457	445	135	115	1.47	1.18	1.02	0.91
Riparia Gloire	4,968	340	343	164	153	1.52	1.31	1.21	1.09
3309C	3,985	559*	310	149	153	1.44	1.73	1.11	1.34
Self-rooted	2,172	269**	167	116***	49	1.05*	0.66	0.66***	0.38
Average		406*	316	141***	118	1.37**	1.22	1.00*	0.93

Potential impacts of the ring nematode, Mesocriconema xenoplax, on grapevines in British Columbia: a microplot study

Publicado en línea: 18 ago 2020

Páginas: 1 - 7

DOI: https://doi.org/10.21307/jofnem-2020-086

Palabras clave
Grape rootstock, Nematode ecology, Nematode management,

© 2020 Thomas Forge et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Maximum, minimum, and mean daily temperatures for the warmest (July or August) and coldest (December or January) months at the site during the course of the microplot experiment.

Effects of rootstock on population densities of Mesocriconema xenoplax (Mx) in inoculated microplots and vine growth parameters for ‘Merlot’ grapevines grown in microplots with (+Mx) or without (−Mx) M. xenoplax.

Potential impacts of the ring nematode, Mesocriconema xenoplax, on grapevines in British Columbia: a microplot study

Publicado en línea: 18 ago 2020

Páginas: 1 - 7

DOI: https://doi.org/10.21307/jofnem-2020-086

Palabras claveGrape rootstock, Nematode ecology, Nematode management,

© 2020 Thomas Forge et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Maximum, minimum, and mean daily temperatures for the warmest (July or August) and coldest (December or January) months at the site during the course of the microplot experiment.

Effects of rootstock on population densities of Mesocriconema xenoplax (Mx) in inoculated microplots and vine growth parameters for ‘Merlot’ grapevines grown in microplots with (+Mx) or without (−Mx) M. xenoplax.

Palabras clave
Grape rootstock, Nematode ecology, Nematode management,