WCN December 2019

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l m, tility generated over $15 in tax revenue creation.2 Spending on export promotion in 2017 created 2,682 jobs.2 The Latest on Disease 66% Resistant Rootstocks THIS ARTICLE IS SPONSORED BY: 66% of the California walnut crop was exported in the 2017/18 crop year. By CECILIA PARSONS walnuts.org | Associate Editor Larger trees with orange band painted on shows test rootstock in a replant orchard infested with nematodes and replant disorder. Two Chandlers on test rootstock are on either side of a Chandler on VX211 and clear performance superiority of test rootstock is painfully obvious. All trees are same age in that row of three. All photos courtesy of Cliff Beumel. SIGNIFICANT PROGRESS IS being January made 2018, Harry in M. Kaiser, the Cornell development University of walnut rootstocks that possess resistance to the major yield limiting diseases and soil-borne pathogens. “We are now working on putative disease resistant walnut genotypes which are being propagating to test in large scale field trials to determine how they perform compared to the greenhouse evaluations, “ said Dan Kluepfel, United States Department of Agriculture (USDA)/Agricultural Research Service (ARS) research scientist and principal investigator of the walnut rootstock development program. “This is not just an academic pursuit. 1 California Agricultural Statistics Review 2016/2017 by CDFA 2 Economic Evaluation of the California Walnut Commission’s Export Promotion Programs: An Analysis of the Direct and Indirect Impacts, We have something in hand and in collaboration with nurseries are moving forward to place these rootstocks in field trials.” Disease-Resistant Rootstocks Disease-resistant rootstocks for commercial walnuts are a huge deal for growers, said Cliff Beumel, a long time walnut grower and nurseryman and President of the fruit, nut and olive tree nursery Agromillora located north of Sacramento near Gridley. “All growers eventually bump up against one of these pressures,” Beumel said of crown gall, Phytopthora and lesion nematodes. “This is a real issue right now in existing orchards.” Most California walnut growers know they need to choose rootstocks based on their ability to resist or tolerate various soil-borne diseases and nematodes, even if pressure is low at the time of planting. After the trees are planted, there are few options for growers, who find these pathogens, to control their impact on tree health. Significant walnut acres are planted with seedling or clonal ‘Paradox” rootstocks which are susceptible to the soil-borne diseases, crown gall, root lesion and root knot nematode and Continued on Page 10 First 5 trees on left show the replant tolerant rootstock and the trees on right are standard Chandler on VX211. 8 West Coast Nut <strong>December</strong> <strong>2019</strong>
On-Site Tissue Culture Lab Walnut Tree Experts 100% Clonal, No Seed! the rootstocks[ best walnut RX 1 USPP #20649 Phytophthora & Crown Gall Resistant Largest Tree & Highest Yield VX 211 USPP #21179 Great Vigor & Nematode Tolerant Survives Well in Field Tests OPTION 1 OPTION 2 OPTION 3 ellepot ® container Paradox Roostock: RX1, VX211, Vlach Great Defense Against Crown Gall Readily Available, Cost Effective straight bareroot Paradox Roostock: RX1, VX211, Vlach One Season Growth Ready to Graft in Your Orchard finished trees Budded or grafted Bareroot Trees on Clonal Paradox Rootstock No Field Budding or Grafting Logistics GROWING QUALITY FRUIT & NUT TREES SINCE 1951 Sierra Gold Nurseries • (530) 674-1145 • sgtrees.com
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