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ARS Home » Pacific West Area » Corvallis, Oregon » Horticultural Crops Research Unit » Research » Publications at this Location » Publication #202695

Title: Evaluation of Nematode Resistant Grape Rootstock for Managing Mesocriconema xenoplax

item Schreiner, R Paul
item Pinkerton, John
item Bryla, David

Submitted to: Northwest Center for Small Fruit Research Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 10/19/2006
Publication Date: 10/30/2006
Citation: Schreiner, R.P., Pinkerton, J.N., Bryla, D.R. 2006. Evaluation of nematode resistant grape rootstock for managing Mesocriconema xenoplax. Northwest Center for Small Fruit Research Proceedings. 15:36-37.

Interpretive Summary:

Technical Abstract: Grafted grapevines were planted on May 3, 2006 in microplots (25 gallon pot-n-pot) that were inoculated with arbuscular mycorrhizal fungi (AMF). Half of the plots received 100,000 ring nematodes (M. xenoplax) at planting. Vines were thinned to 1 shoot on June 8, which was trained upright on a bamboo stake. All plots have received ample water throughout the summer, by maintaining soil moisture above 15% volumetric water content. Leaf samples for nutrient analysis were collected the week of August 21 (veraison), and soil samples for estimating nematode populations, root length, and AMF colonization were collected in October. Results thus far indicate that the presence of ring nematodes in plots is not yet influencing shoot growth or gas exchange of vines, although differences between rootstocks have been significant. The total shoot length (main shoot plus laterals) of Pinot noir was initially (June 23) lower on 420A and 110R rootstocks compared to 1103P and 101-14. Later in the summer (August 2), 420A was significantly lower than 1103P and 3309C. Leaf area (August 2) was also lower on 420A compared to 1103P and 3309C, with the other rootstocks (110R, 101-14, self) being intermediate. Interestingly, stomatal conductance on August 17 and 18 was highest in 420A and lowest in 3309C and 1103P vines, indicating a compensation for lower leaf area with higher gas exchange per unit of leaf area among rootstocks.