Evaluation of Seedlings of Fraser, Momi, and Siberian Fir for Resistance to Phytophthora cinnamomi

Hinesley, L. Eric; Parker, K. C.; Benson, D. M.

doi:10.21273/hortsci.35.1.87

Cited by 14 publications

(11 citation statements)

References 2 publications

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“…Differences in susceptibility to P. cinnamomi among closely related species have been reported in Rhododendron L. (Benson, 1980;Hoitink and Schmitthenner, 1974;Krebs and Wilson, 2002), Vaccinium L. (Clark et al, 1986), Banksia L.f. (McCredie et al, 1985), and Abies Mill. (Benson et al, 1998;Hinseley et al, 2000). Even cultivars, clones, or provenances of the same species have shown significant differences in susceptibility, as in the case of Pinus radiata D.Don (Butcher et al, 1984), Persea americana Mill.…”

Section: Resultsmentioning

confidence: 99%

Differential Resistance of Gordonieae Trees to Phytophthora cinnamomi

Meyer¹,

Ranney²,

Eaker³

et al. 2009

horts

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Trees in the Theaceae tribe Gordonieae are valuable nursery crops, but some of these taxa are known to be highly susceptible to root rot caused by Phytophthora cinnamomi Rands. The objective of this study was to evaluate a collection of Gordonieae taxa for resistance to this pathogen. These taxa included Franklinia alatamaha Bart. Ex Marshall, Gordonia lasianthus (L.) Ellis, Schima wallichii Choisy, S. khasiana Dyer, ·Schimlinia floribunda Ranney & Fantz, and ·Gordlinia grandiflora Ranney & Fantz. Abies fraseri (Pursh) Poir. was also included in the study as a positive control. Containergrown trees were inoculated with three isolates of P. cinnamomi and symptoms were rated over an 84-day period during the summer of 2008. Disease symptom ratings from 1 (healthy) to 4 (dead) were collected twice weekly and area under the disease progress curve (AUDPC) values were calculated. None of the S. khasiana or S. wallichii exhibited any root rot symptoms or mortality, whereas the remaining species showed symptoms of infection at varying levels over time. Symptoms in F. alatamaha and A. fraseri were apparent before other taxa, and mortality for both species reached 100% by the end of the experiment. Comparison of AUDPC values indicated that F. alatamaha was the most susceptible followed by A. fraseri. There was no significant difference in AUDPC among the more resistant taxa, including G. lasianthus, both Schima species, and the intergeneric hybrids. Values for AUDPC in the hybrid taxa were similar to their more resistant parental genus, indicating that resistance to P. cinnamomi is a partially dominant trait in these plants. These results further suggest the potential to breed improved hybrids of Gordonieae trees with substantial resistance to P. cinnamomi.

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Section: Resultsmentioning

confidence: 99%

Differential Resistance of Gordonieae Trees to Phytophthora cinnamomi

Meyer¹,

Ranney²,

Eaker³

et al. 2009

horts

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“…Abies species are know to vary widely in their response to various biotic and abiotic stresses. including resistance to fungal diseases and drought and cold tolerance (Eiga and Sakai, 1987;Guehl et al, 1991;Hinesley et al, 2000;Sakai, 1982). Although we have no specifi c information on the soils from which these species were selected, other Abies species occur on diverse soils and differ in pH tolerance.…”

Section: Discussionmentioning

confidence: 99%

Chlorophyll Fluorescence and Needle Chlorophyll Concentration of Fir (Abies sp.) Seedlings in Response to pH

Cregg¹,

Duck²,

Rı́os³

et al. 2004

HortSci

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We assessed variable chlorophyll fluorescence (Fv/Fm) and needle chlorophyll concentration of seedlings of Maccedonia fir (Abies borisii regis Mattfeld), subalpine fir [A. lasiocarpa (Hooker) Nuttall], Sakhalin fir [A. sachalinensis (Schmidt) Mast.], Siberian fir [A. sibirica (Lebed.)], and Veitch fir (A. veitchii Lindl.) grown under varying soil media pH. Soil media pH was modified using liquid flowable dolomitic limestone, resulting in five pH levels (3.4, 4.0, 5.4, 6.0, and 6.8). Increasing media pH significantly reduced Fv/Fm and needle chlorophyll concentration in all of the species tested. The effect of pH on photochemistry was due to depressed nutrient uptake of P, Mn, B, and Cu. Because photosynthetic quantum yield may be related to deficiencies of several elements affected by pH, Fv/Fm may serve as a criterion to select for improved pH tolerance. Among the species examined, A. veitchii and A. lasiocarpa were most tolerant of increased pH based on Fv/Fm and needle chlorophyll concentration.

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“…A weather station at the Russell E. Larson Agriculture Research Center provided air temperature and precipitation data throughout the experiments. Foliar disease ratings, adapted from the top ratings of Hinesley et al (2000), were recorded for each seedling at the conclusion of the experiment. The ratings were as follows: 1 = healthy (no necrosis), 2 = mild symptoms (1% to 33% necrosis), 3 = moderate symptoms (34% to 67% necrosis), 4 = severe symptoms (68% to 99% necrosis), and 5 = dead (100% necrosis).…”

Section: Methodsmentioning

confidence: 99%

Fungicide Efficacy in Prevention of Root Rot Incited by Phytophthora cactorum and Phytophthora drechsleri in Fraser Fir Seedlings

Hoover

Bates

2012

hortte

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The most serious disease problem in fraser fir (Abies fraseri) Christmas tree production is phytophthora root rot (PRR). The efficacies of six fungicide treatments in preventing PRR incited by Phytophthora cactorum and P. drechsleri in 2-year-old fraser fir seedlings were evaluated in 2010 and 2011 in central Pennsylvania. The study examined five fungicide drench treatments [dimethomorph, fosetyl-aluminum (fosetyl-Al), hydrogen dioxide, mefenoxam, propamocarb hydrochloride] and one soil spray treatment (mefenoxam) in raised planting boxes. Dimethomorph applied on 14-day intervals prevented foliar disease symptoms and mortality in fraser fir seedlings exposed to either P. cactorum or P. drechsleri. One-time application of fosetyl-Al or mefenoxam were effective at times in preventing foliar disease symptoms and mortality in fraser fir seedlings exposed to P. drechsleri but were not as effective against P. cactorum.

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Evaluation of Seedlings of Fraser, Momi, and Siberian Fir for Resistance to Phytophthora cinnamomi

Cited by 14 publications

References 2 publications

Differential Resistance of Gordonieae Trees to Phytophthora cinnamomi

Differential Resistance of Gordonieae Trees to Phytophthora cinnamomi

Chlorophyll Fluorescence and Needle Chlorophyll Concentration of Fir (Abies sp.) Seedlings in Response to pH

Fungicide Efficacy in Prevention of Root Rot Incited by Phytophthora cactorum and Phytophthora drechsleri in Fraser Fir Seedlings

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