Testing of selected South African Pinus hybrids and families for tolerance to the pitch canker pathogen, Fusarium circinatum

Roux, Jolanda; Eisenberg, B. E.; Kanzler, Arnulf; Nel, André; Coetzee, V.; Kietzka, Eric; Wingfield, Michael J.

doi:10.1007/s11056-006-9017-4

Cited by 55 publications

(62 citation statements)

References 18 publications

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“…This is consistent with the general experience of South African nurserymen and has been recorded elsewhere (Hammerbacher 2005). It is further relevant that the level of contamination for the different species or hybrids in the studies carried out by Mitchell et al (2009) was consistent with the general level of tolerance of these species or hybrids in inoculation studies (Roux et al 2007) (Figure 4).…”

Section: Infection and Dispersalsupporting

confidence: 62%

“…Indeed, some studies have already shown this. Hybrids between P. patula and more-tolerant partners such as P. tecunumanii and P. oocarpa are significantly more tolerant to F. circinatum on three-year-old trees (Roux et al 2007). …”

Section: Strategy 2: Hybridisationmentioning

confidence: 99%

“…First, the greater tolerance of some species over others (Viljoen et al 1995, Hodge andDvorak 2000) suggests that more-tolerant species could be planted as substitutes, where possible. Secondly, the susceptible species can be hybridised with more-tolerant species in order to impart tolerance to the progeny (Roux et al 2007). Thirdly, the use of more-tolerant families or clones within a generally accepted susceptible species has shown improved tolerance (Rockwood et al 1988).…”

Section: Long-term Management Strategiesmentioning

confidence: 99%

“…For South Africa, this is particularly true if the main species planted is known to be susceptible to F. circinatum such as is the case with P. patula, in the summer rainfall regions, and P. radiata in the winter rainfall regions. Greenhouse studies and field observations have shown significant variation in host susceptibility to F. circinatum at the species, provenance, family and clonal level , Dwinell and Barrows-Broaddus 1982, BarrowsBroaddus and Dwinell 1984, Hodge and Dvorak 2000, Roux et al 2007). The first comprehensive study conducted on a large number of species from all subsections of Pinus was published by Hodge and Dvorak (2000).…”

Section: Strategy 1: Alternative Speciesmentioning

confidence: 99%

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The pitch canker fungus,Fusarium circinatum: implications for South African forestry

Mitchell

Steenkamp

Coutinho

et al. 2011

Southern Forests: a Journal of Forest Science

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Fusarium circinatum, the causal agent of pitch canker of mature pines and root/collar rot of pine seedlings/cuttings, has resulted in large-scale losses to pine forestry in various parts of the world. The disease caused by this fungus is now regarded as one of the most important threats to pine plantations by a pathogen. Fusarium circinatum was first discovered in South Africa in 1990 where it infected Pinus patula seedlings in a nursery. Subsequently, the pathogen spread to pine nurseries in all other parts of the country, where it affects several Pinus species. Fusarium circinatum then appeared in the field where it has resulted in large-scale mortality of mostly young P. patula seedlings after planting. Pitch canker first appeared on mature P. radiata in 2006 and sporadic outbreaks of the disease have occurred subsequently on this species and on P. greggii in the western, southern and north-eastern Cape. Pinus patula is the most important softwood species grown in South Africa, comprising 50% of all softwoods planted, and is highly susceptible to F. circinatum. The pathogen, therefore, poses a potentially devastating threat to the future sustainability of the South African softwood industry. Strategic measures to minimise further spread are urgently needed. This review presents an overview of the impact that F. circinatum has had on South African forestry, and it considers the long-term prospects for pine forestry in the country as this relates to the presence of the pitch canker fungus.

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Section: Infection and Dispersalsupporting

confidence: 62%

Section: Strategy 2: Hybridisationmentioning

confidence: 99%

Section: Long-term Management Strategiesmentioning

confidence: 99%

Section: Strategy 1: Alternative Speciesmentioning

confidence: 99%

See 2 more Smart Citations

The pitch canker fungus,Fusarium circinatum: implications for South African forestry

Mitchell

Steenkamp

Coutinho

et al. 2011

Southern Forests: a Journal of Forest Science

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“…It seems likely that the susceptibility of seedlings could be assessed by either stem inoculations or branch inoculations, but for larger trees in the field, branch inoculations would allow for the speedy screening of disease resistant individuals. Branch inoculation results on larger trees were closely correlated with those from stem inoculations (Roux et al, 2007).…”

Section: Resultsmentioning

confidence: 58%

Assessment of Pathogenic Variation against Pitch Canker Pathogen, Fusarium circinatum in Pinus thunbergii and Responses of Natural Selection Pinus × rigitaeda to Branch Inoculation in a Seed Orchard

Woo¹,

Yoon²,

Han³

et al. 2010

The Plant Pathology Journal

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A half-sib family of two 4-year-old seedlings of Pinus × rigitaeda was inoculated with each of 20 Pinus thunbergii isolates of Fusarium circinatum (syn. Fusarium subglutinans f. sp. pini) from two pitch canker damaged sites in Jeju Island, South Korea. Initial symptoms of needle damages were visible on most of the seedlings at 18 days after inoculation. The 20 tested isolates were not significantly different in virulence, based on lesion lengths at the site of inoculation (P = 0.217). The most virulent isolate FT-7 showed the longest lesion length. Some seedlings began to die 46 days after inoculation. All seedlings were dead by 68 days after inoculation except two seedlings inoculated with each of isolates FS-2 and FS-13, respectively. Using the FT-7, 38-year-old 11 P. × rigitaeda trees, which were survived from a seed orchard severely damaged by pitch canker, were inoculated on branches in the seed orchard in Jeju Island to assess differences in susceptibility to pitch canker. The 11 trees differed significantly (P < 0.001) in susceptibility to F. circinatum based on average lesion lengths measured 56 days after inoculation. It is possible that induced resistance contributed to their capacity to limit lesion development. The susceptibility of natural selection P. × rigitaeda trees are more likely affected by interaction with F. circinatum rather than environmental conditions.

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Genomics of Disease Resistance in Loblolly Pine

Ence

Quesada

Brawner

et al. 2022

Compendium of Plant Genomes

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Testing of selected South African Pinus hybrids and families for tolerance to the pitch canker pathogen, Fusarium circinatum

Cited by 55 publications

References 18 publications

The pitch canker fungus,Fusarium circinatum: implications for South African forestry

The pitch canker fungus,Fusarium circinatum: implications for South African forestry

Assessment of Pathogenic Variation against Pitch Canker Pathogen, Fusarium circinatum in Pinus thunbergii and Responses of Natural Selection Pinus × rigitaeda to Branch Inoculation in a Seed Orchard

Genomics of Disease Resistance in Loblolly Pine

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