Host range of Nectria galligena Bres. and the pathogenicity of some Northern Ireland isolates

Flack, N. J.; Swinburne, T. R.

doi:10.1016/s0007-1536(77)80007-7

Cited by 25 publications

(28 citation statements)

References 6 publications

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“…There is large conidial diversity between the Neonectria and Cylindrocarpon genera (BRAYFORD, 2004;CHAVERRI et al, 2011), with respect to presence or absence of microconidia, macroconidia, chlamydospores, and number of septa. Variation in number of septa can be associated with factors such as nutrition, relative humidity, and temperature (FLACK & SWINBURNE, 1977). Conidium length and number of septa may vary with glucose, carbon concentration and initial medium pH, nitrogen source, and culture age (HARDING, 1975).…”

Section: Discussionmentioning

confidence: 99%

“…(CASTLEBURY et al, 2006;CHAVERRI et al, 2011;WEBER, 2014). The causal agent was originally named Nectria ditissima in 1865 (FLACK & SWINBURNE, 1977) and is already well spread worldwide (SANHUEZA, 1998;BOGO et al, 2008). In Brazil, EC was first reported in a nursery in Vacaria municipality in the state of Rio Grande do Sul at 1998(SANHUEZA, 1998.…”

Section: Introductionmentioning

confidence: 99%

“…It is difficult to distinguish microconidia from immature macroconidia (BOOTH, 1966;WEBER, 2014). FLACK & SWINBURNE (1977) had noted differences in both host range and symptoms produced by Nectria spp. from different source hosts.…”

Section: Introductionmentioning

confidence: 99%

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European apple canker: morphophysiological variability and pathogenicity in isolates of Neonectria ditissima in southern Brazil

et al. 2017

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European apple canker (EC) is caused by Neonectria ditissima, a pathogen officially registered as a quarantine pest in 2012. Thirty-five isolates of N. ditissima of different geographical regions of southern Brazil from apple branches showing symptoms of EC were identified by the specific pair primers Ch1 and Ch2 and analyzed concerning the virulence on Gala apple cultivar and morphophysiological characteristics. The disease symptoms were characterized and the isolates compared based on average mycelium growth (AMG), mycelium growth index (MGI), colony color, conidia type, dimensions and growth on potato dextrose agar (PDA), malt agar (AM), and synthetic SNAY (SN) culture media. Nineteen isolates showed the greatest AMG on PDA, forming three growth groups of 35.56 (GI), 52.71 (GII), and 62.67mm (GIII). Seven isolates showed MGI greater than 4.0mm diameter on PDA compared with that on AM and SN. The highest conidia production was on SN, and the predominant colony color in all media was white to beige with central pigmentation of brown and borders colored in shades of beige. There were significant differences among the average dimensions of micro- and macroconidia on PDA, AM, and SN. The pathogenicity was confirmed for all isolates despite of different morphophysiological characteristics. There was no correlation among isolates morphophysiological variability, virulence, and geographical origin.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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European apple canker: morphophysiological variability and pathogenicity in isolates of Neonectria ditissima in southern Brazil

et al. 2017

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“…Nectria spp. are usually saprotrophs, but in favourable conditions they can cause canker or bark necrosis on many tree species (Flack and Swinburne, 1977; Butin, 1995).…”

Section: Discussionmentioning

confidence: 99%

Frost Injury as a Possible Inciting Factor in Bud and Shoot Necroses of Fraxinus excelsior L.

Pukacki¹,

Przybył²

2005

Journal of Phytopathology

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Large numbers of European ash have died in Poland in all age classes during the last ten years. The characteristic symptom occurring on shoots of planted and self-sown seedlings was bark necroses starting from the shoot apex, necrotic buds, or leaf and twig scars. The results showed that in the bud tissue of cold acclimated European ash extracellular and intracellular ice formation occurred at approximately )9 and )32°C, respectively. In deacclimated plants in spring water supercooling is limited by the heterogenous ice nucleation temperature and consequently the cold tolerance is )9 to )4°C for bud tissues and )13 to )9°C for shoots. Isolations of fungi were performed from dead buds and from necroses occurring on the main stem. Alternaria alternata, Fusarium lateritium and Phomopsis scobina were among the fungi occurring in both these organs at frequencies of more than 7%. Cylindrocarpon heteronemum, Diplodia mutila and Tubercularia vulgaris from necroses were only isolated in frequencies; 3.3, 1.2 and 5.4%, respectively. It seems likely that freezing injury is the inciting factor, which combined with fungal colonization manifests itself as fatal damage to European ash buds and shoots.

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“…Native to eastern North America, the fungus is most notable for the extensive scarring caused by perennial cankers on Betula (birch) species and black walnut (Juglans nigra) (Spaulding et al 1936). In addition to causing disease on Malus (apple) and Pyrus (pear) trees in orchards (Flack & Swinburne 1977), N. ditissima is associated, along with its sister species, Neonectria faginata, with beech bark disease (Cotter & Blanchard 1981;Houston 1994). Neonectria ditissima produces both asexual and sexual spores (conidia and ascospores, respectively) in nature (Lortie & Kurtz 1963), but virtually nothing is known about the relative contributions of each in creating new infections, nor about the dispersal range.…”

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confidence: 99%

Isolation of eight microsatellite markers from Moina macrocopa for assessing cryptic genetic structure in the wild

Tatsuta

Yao

Tanaka

2009

Molecular Ecology Resources

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We isolated eight polymorphic microsatellite loci from the zooplankton Moina macrocopa (Straus), which is sensitive to pollutants such as insecticides and heavy metals. The isolated loci were polymorphic, with three to seven alleles among 23 individuals. Expected heterozygosities ranged from 0.167 to 0.787. These loci can be used to examine cryptic genetic structure and to infer the connectivity among metapopulations.

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Host range of Nectria galligena Bres. and the pathogenicity of some Northern Ireland isolates

Cited by 25 publications

References 6 publications

European apple canker: morphophysiological variability and pathogenicity in isolates of Neonectria ditissima in southern Brazil

European apple canker: morphophysiological variability and pathogenicity in isolates of Neonectria ditissima in southern Brazil

Frost Injury as a Possible Inciting Factor in Bud and Shoot Necroses of Fraxinus excelsior L.

Isolation of eight microsatellite markers from Moina macrocopa for assessing cryptic genetic structure in the wild

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