Project Number: 1910-21220-004-24
Project Type: Trust

Start Date: Aug 01, 2010
End Date: Jul 31, 2013

Objective:
To breed, evaluate, and introduce rootstocks that are resistant to aggressive root-knot nematodes, resulting in improved varieties with adaptation to California viticulture. To achieve this objective, we will evaluate the root-knot nematode resistance of 4,000 grape rootstock seedlings and select resistant seedlings for advancement to the field, evaluate the rooting ability of 150 rootstock selections and confirm nematode resistance of easily rooted selections, and enter 11 easily rooted nematode resistance confirmed selections into a replicated rootstock trial.

Approach:
The proposed work is breeding grapevine rootstocks resistant to aggressive virulent root-knot nematode (Meloidogyne species) populations. Grapevine rootstock germplasm will be screened for resistance to aggressive virulent root-knot nematodes, crosses made, and resistant seedling selections identified through screening. Resistant seedlings will be tested for propagation ability and nematode resistance confirmed through replicated plant testing.