Pathogenicity of Phytophthora austrocedrae on Austrocedrus chilensis and its relation with mal del ciprés in Patagonia

Greslebin, Alina Gabriela; Hansen, E. M.

doi:10.1111/j.1365-3059.2010.02258.x

Cited by 46 publications

(94 citation statements)

References 18 publications

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“…This inoculation method has been used many times as a test of the susceptibility of different hosts to Phytophthora spp. (Rizzo et al 2002;Hüberli et al 2002;Oh et al 2006;Durán et al 2008;Greslebin and Hansen 2010) and appears to offer a reliable means to estimate broad differences in susceptibility of Pinus spp.…”

Section: Discussionmentioning

confidence: 99%

“…are amongst the most serious and invasive plant pathogens on both agricultural and forestry crops (Fry and Goodwin 1997;Rizzo et al 2002). In terms of forestry, the recent emergence of species such as Phytophthora ramorum and P. austrocedrae (Rizzo et al 2002;Greslebin et al 2007) has reinforced the fact that these pathogens are a serious threat to forestry worldwide, both in natural ecosystems and plantations Garbelotto et al 2003;Greslebin and Hansen 2010). The appearance of a needle blight of Pinus spp.…”

Section: Introductionmentioning

confidence: 99%

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Pathogenicity and sporulation of Phytophthora pinifolia on Pinus radiata in Chile

Ahumada

Rotella

Slippers

et al. 2013

Australasian Plant Pathol.

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Phytophthora pinifolia causes the needle and shoot disease of Pinus radiata known as Daño Foliar del Pino (DFP) in Chile. The first pathogenicity trials with this organism utilized mycelial plugs placed on stem wounds. These resulted in lesions in the tissue, but did not reproduce the resinous bands on the needles, which are the most characteristics symptoms of the disease under natural conditions. In this study, stem inoculations were repeated, but to complete Koch's postulates fully, and to confirm that P. pinifolia causes the symptoms observed on naturally infected trees, zoospore/sporangial suspensions were used to inoculate pine foliage. This method produced the same symptoms observed on needles infected naturally. These results confirm that P. pinifolia is the causal agent of the Daño Foliar del Pino on P. radiata in Chile and successfully completed Koch's postulates for the first time. Pathogenicity tests on different Pinus spp. and hybrids showed a wide range of responses to inoculation with P. pinifolia mycelial plugs, from highly susceptible to resistant. Monitoring of sporulation revealed that the sporangia commonly remain on the needles for extended periods of time and their frequency of occurrence and dispersal appear to increase during the rainy season.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pathogenicity and sporulation of Phytophthora pinifolia on Pinus radiata in Chile

Ahumada

Rotella

Slippers

et al. 2013

Australasian Plant Pathol.

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“…This is in contrast to the fact that some other Phytophthora spp. have been isolated from wood of infected trees using similar techniques , Hansen et al 2005, Jung et al 2005, Greslebin et al 2007, Greslebin and Hansen 2010. Some of these Phytophthora spp.…”

Section: Discussionmentioning

confidence: 99%

“…Some species of Phytophthora, like P. austrocedrae, P. cambivora, P. cinnamomi and P. ramorum among others can be found in the phloem, normally 4 associated with stem cankers (Hamm and Hansen 1987, Rizzo et al 2002, Brown and Brasier 2007, Parke et al 2007, Moralejo et al 2009, Greslebin and Hansen 2010. There are also a few Phytophthora species that have been detected in the xylem tissue.…”

Section: Introductionmentioning

confidence: 99%

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Potential ofPhytophthora pinifoliato spread via sawn green lumber: a preliminary investigation

Ahumada¹,

Rotella²,

Slippers³

et al. 2012

Southern Forests: a Journal of Forest Science

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Phytophthora pinifolia causes the needle and shoot disease of Pinus radiata in Chile known as Daño Foliar del Pino (DFP). Although P. pinifolia is primarily a needle pathogen, there are concerns that it might be spread to new environments via the export of contaminated timber. In order to determine whether P. pinifolia can enter or persist in green sawn lumber, its presence in lumber produced from trees exposed to the pathogen for at least four years was examined. Green lumber produced from the infected trees, and green wood samples artificially exposed to P. pinifolia inoculum, were analyzed by making extensive isolations on Phytophthora selective media. In addition, PCR was conducted using species-specific primers developed for P. pinifolia. Results of the study showed that the green sawn lumber taken from trees infected by P. pinifolia, or green lumber exposed in infected pine plantations, displayed no evidence of the pathogen surviving in this material.

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Urban environments harbor greater oomycete and Phytophthora diversity, creating a bridgehead for potential new pathogens to natural ecosystems

et al. 2022

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Anthropogenic activities contribute to changes in the range and distribution of species. Globalization is resulting in human‐mediated dispersal that is causing a breakdown in normal biogeographic barriers. But the impact of anthropogenic activities on plant pathogen communities is still poorly understood. We conducted an eDNA metabarcoding study to compare communities of oomycetes, a group of eukaryotic microorganisms that comprises important crop and tree pathogens, in urban, natural, and interface environments. Oomycete diversity and abundance were highest in human impacted urban environments and lowest in natural environments, while the interface environments were intermediate. Urban environments had the highest proportion of sites where species of the plant pathogenic genus Phytophthora were found, as well as the largest number of unknown or undescribed Phytophthora species. The taxa overlap between urban and interface environments was one order of magnitude larger than the overlap between urban and natural environments. Our analyses show that urban/natural interface areas likely act as a bridge for invasion into natural environments. This could impact both the natural biota and natural ecosystem processes. Our study serves as a warning that some Phytophthora species introduced from nurseries or spread by human movement could pose a threat to natural ecosystems. Shifting patterns in oomycete communities could interfere with natural ecosystem processes and result in increases in disease and ecosystem declines.

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Pathogenicity of Phytophthora austrocedrae on Austrocedrus chilensis and its relation with mal del ciprés in Patagonia

Cited by 46 publications

References 18 publications

Pathogenicity and sporulation of Phytophthora pinifolia on Pinus radiata in Chile

Pathogenicity and sporulation of Phytophthora pinifolia on Pinus radiata in Chile

Potential ofPhytophthora pinifoliato spread via sawn green lumber: a preliminary investigation

Urban environments harbor greater oomycete and Phytophthora diversity, creating a bridgehead for potential new pathogens to natural ecosystems

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