Kingfisher resulted from selection of a seedling in a population derived from controlled hybridization of the Vitis hybrid rootstock selection 4-12A (seed parent) with Vitis riparia (pollen parent). 4-12A is a cross of V. x champinii Dog Ridge and V. rufotomentosa. The original Kingfisher vine was planted in 2002. In addition to nematode resistance and propagation evaluations, Kingfisher has been evaluated grafted to Syrah in a rootstock trial in California.
Kingfisher is easily rooted from dormant cuttings and bench grafted to Vitis vinifera scions. Kingfisher was identified as a seedling selection on December 24, 2002 due to its complete suppression of root-knot nematode reproduction in greenhouse evaluation. Root-knot nematode resistance was confirmed in replicated tests of cutting grown plants. The nematode population used to confirm resistance was an N-virulent nematode population capable of feeding on and damaging N-allele grapevine rootstocks, such as Harmony and Freedom.
Dormant cuttings collected from plants grown in a California vineyard were evaluated for rooting ability; 100% of dormant cuttings of Kingfisher successfully propagated and produced callus, shoots, and roots. Kingfisher was grafted to Syrah and planted into a rootstock trial at UC KREC, Parlier, California in 2005. When four years of fruiting data and three years of pruning weight data are considered, Kingfisher rootstock showed a fruit to pruning weight ratio of 6.53. The check rootstock, Freedom, showed a fruit to pruning weight ratio of 6.14, demonstrating the improved production efficiency of Kingfisher rootstock compared to Freedom.
The National Grape Registry (NGR) contains information about varieties of wine, juice, and table grapes, raisins, and grape rootstocks available in the United States. Growers, nurseries, winemakers and researchers can find background information and source contacts for those grape varieties in this single convenient location.
Foundation Plant Services at UC Davis is the source of Foundation grapevine material for the nursery industry, and the staff can provide information about possible sources for obtaining this stock.
Cousins, P. 2011. Three Root-Knot Nematode Resistant Rootstocks Released By USDA Agricultural Research Service (pdf). FPS Grape Program Newsletter, University of California, Davis, California. Page 12.