BREEDING ROOTSTOCKS RESISTANT TO AGGRESSIVE ROOT-KNOT NEMATODES
Grape Genetics Research
2009 Annual Report
1a.Objectives (from AD-416)
Breed, evaluate, and introduce rootstocks that are resistant to root-knot nematodes and adapted to California's growing season.
1b.Approach (from AD-416)
Screen seedlings for nematode resistance, select superior resistant seedlings, advance selections to field testing and further evaluation, and identify parents for the next round of crossings
Screening more than 2500 candidate grape rootstock seedlings for resistance to aggressive root-knot nematodes. Only those seedlings which completely suppress nematode reproduction and show zero nematode egg masses are selected for further testing. These selected seedlings are propagated and then planted into the vineyard. The dormant cutting rooting ability of 156 nematode resistant rootstock selections was evaluated and 142 easy rooting selections were advanced for additional nematode resistance testing. Project monitoring was accomplished by providing a detailed written report of research activities and progress to the American Vineyard Foundation.