2013
DOI: 10.21273/hortsci.48.1.68
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Evaluating Paradox Walnut Rootstocks for Resistance to Armillaria Root Disease

Abstract: The most common rootstock for Juglans regia (Persian or ''English'' walnut) in California is Paradox, typically a hybrid of J. hindsii (Northern California black walnut) 3 J. regia. Unfortunately, Paradox is very susceptible to Armillaria root disease. The relative resistance to Armillaria mellea of six clonally propagated Paradox rootstocks (AX1, Px1, RR4 11A, RX1, Vlach, VX211) was evaluated and compared with that of clonally propagated J. hindsii rootstock selection W17, J. regia scion cultivar Chandler, an… Show more

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Cited by 17 publications
(10 citation statements)
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“…In California, the cultivation of J. regia is most commonly facilitated using Paradox rootstock ( J. hindsii ♀ × J. regia ♂), which is valued for its resistance to soil‐borne pathogens (Potter et al , ; Browne et al , ). Despite improved resistance to several diseases, Paradox rootstock remain susceptible to Armillaria root rot, which is caused by a basidiomycete, A. mellea (Baumgartner et al , ). The impact of this disease is worsened by the lack of post‐infection controls.…”
Section: Discussionmentioning
confidence: 99%
“…In California, the cultivation of J. regia is most commonly facilitated using Paradox rootstock ( J. hindsii ♀ × J. regia ♂), which is valued for its resistance to soil‐borne pathogens (Potter et al , ; Browne et al , ). Despite improved resistance to several diseases, Paradox rootstock remain susceptible to Armillaria root rot, which is caused by a basidiomycete, A. mellea (Baumgartner et al , ). The impact of this disease is worsened by the lack of post‐infection controls.…”
Section: Discussionmentioning
confidence: 99%
“…), apple ( Malus spp.) and highbush blueberry ( Vaccinium corymbosum ) (Baumgartner and Rizzo, 2001, Prodorutti et al., 2009, Thomidis and Exadaktylou, 2012, Baumgartner et al., 2013, Elías-Román et al., 2013). Losses can be substantial: 10 % in infected pear ( Pyrus spp.)…”
Section: Pathogenic Basidiomycetesmentioning
confidence: 99%
“…have used herbaceous plants that are quick to establish and easy to manipulate as an alternative to woody species in long-term trials or use of in vitro approaches that require laborious tissue culture methods. This assay can be completed in 3 months a substantial reduction in experimental duration in comparison to traditional inoculation assays which may last for several years (Cleary et al, 2013;Mallett & Hiratsuka, 1988;Shaw et al, 1981;Tsopelas & Tjamos, 1997) and comparable with in vitro infection assays (Baumgartner et al, 2010(Baumgartner et al, , 2013. Moreover, our assay is conducted in a controlled environment, which will avoid fluctuating environmental conditions that can introduce further variability to experiments and will also allow the use of transgenic strainssomething that would be problematic in an open field trial.…”
Section: Erigeron Speciosusmentioning
confidence: 98%
“…Another recent study has also endeavoured to use agar as Armillaria inocula without success (Sitienei, Wagara, Kariuki, & Jefwa, 2015). Agar plugs have been used previously in Armillaria inoculation assays, but only in vitro (Baumgartner et al, 2010(Baumgartner et al, , 2013 or in the inoculation of cassava tubers where mycelial agar plugs were inserted into wounds that were subsequently sealed to prevent desiccation (Mwenje et al, 1998). Since desiccation of inocula is common in Armillaria inoculation assays, and smaller sized inocula is more prone to drying out than larger inocula (Baumgartner et al, 2010;Perez-Sierra & Gorton, 2005), agar plugs seem inappropriate for use as soil inocula unless protected from desiccation.…”
Section: Erigeron Speciosusmentioning
confidence: 99%
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