<i>Eucalypt dieback associated with</i>Phytophthora cinnamomi<i>following logging, wildfire and favourable rainfall</i>

Fagg, PC; Ward, Brock; Featherston, G. R.

doi:10.1080/00049158.1986.10674461

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…In this study, the presence of five Phytophthora species in the rhizosphere of Corymbia calophylla was detected, and there was a significantly higher prevalence of Phytophthora in anthropogenically disturbed stands. This is in line with previous reports where Phytophthora diebacks in Australia have been associated with human activities such as earthworks, logging and wildfires (Davison, 1997;Fagg, Ward, & Featherston, 1986;Marks, Fagg, & Kassaby, 1975).…”

Section: Field Surveysupporting

confidence: 93%

Field survey, isolation, identification and pathogenicity of Phytophthora species associated with a Mediterranean‐type tree species

et al. 2018

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Summary Corymbia calophylla (marri), a keystone tree species in the global biodiversity hot spot of southwestern Australia, is suffering decline and mortality associated with a canker disease caused by the endemic fungus Quambalaria coyrecup. Phytophthora species are frequently isolated from the rhizosphere of C. calophylla, and a hypothesis is that Phytophthora root infection is predisposing C. calophylla to this endemic canker pathogen. Field surveys were conducted in both anthropogenically disturbed and undisturbed C. calophylla stands, from where a total of 100 rhizosphere soil samples, from both healthy and cankered trees, were collected. Phytophthora species were isolated from 26% of the samples collected, with Phytophthora incidence significantly higher on disturbed stands than in natural forests (73% and 27%, respectively). Five Phytophthora species were recovered, including P. cinnamomi, P. elongata, P. multivora, P. pseudocryptogea and P. versiformis. Under‐bark inoculations with the Phytophthora isolates caused significant lesion lengths in excised C. calophylla stems. Corymbia calophylla response to pot infestation trials in the glasshouse varied between Phytophthora species and isolates, with isolates of P. cinnamomi and P. multivora causing a significant reduction in seedling root volume and often leading to seedling death. This study demonstrates that root disease caused by Phytophthora species, especially P. cinnamomi and P. multivora, has the ability to adversely affect C. calophylla health. This study leads the way to do a dual inoculation trial with the canker pathogen Q. coyrecup, and different Phytophthora species to investigate if Phytophthora root infection predisposes C. calophylla to this canker disease.

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Section: Field Surveysupporting

confidence: 93%

Field survey, isolation, identification and pathogenicity of Phytophthora species associated with a Mediterranean‐type tree species

et al. 2018

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“…However, the flooding acted synergistically with P. cinnamomi infection on gs and PLWP in Q. ilex plants, suggesting that oak decline might occur more rapidly in waterlogged than in well‐drained infected sites. Waterlogging increased the severity of P. cinnamomi ‐induced diseases in the field (Fagg et al ., 1986). Under controlled experiments, when waterlogging was imposed at or after the time of inoculation, lengths of lesions caused by P. cinnamomi significantly increased (Davison & Tay, 1987).…”

Section: Discussionmentioning

confidence: 99%

Root infection by Phytophthora cinnamomi in seedlings of three oak species

Robin¹,

Capron

Desprez-Loustau

2001

Plant Pathology

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The combination of soil infestation with Phytophthora cinnamomi and repetitive flooding was studied on 1-year-old plants of Quercus ilex (holm oak) and Q. suber (cork oak). In a second experiment, using 2-year-old plants of the same species and of red oak (Q. rubra), the soil infestation was followed by two drought-rewatering cycles. Oak predawn leaf water potential (PLWP) and stomatal conductance (gs) were monitored during both experiments. Root infection, root loss, wilting and mortality were assessed at the end of the experiments. Q. ilex exhibited the highest susceptibility to P. cinnamomi, and Q. rubra the lowest. Root infections caused by P. cinnamomi were more severe in the flooding than in the drought experiment. The most noticeable effect of the infection on plant water relations was a decrease in stomatal conductance. This occurred at different times after inoculation, varying with species susceptibility and experiment. Inoculation with P. cinnamomi induced a decrease of PLWP in Q. ilex plants, and in some Q. suber plants exhibiting a severe root loss. The results further showed that the relationship between PLWP and gs was modified by infection with P. cinnamomi. The combination of flooding and infection with P. cinnamomi acted synergistically on the water relations of Q. ilex. By contrast, there was no significant increase in disease severity due to the postinoculation water stress imposed on the oaks.

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“…However, the expression of disease associated with P. cinnamomi throughout temperate Australia varies with environmental conditions (Shearer and Smith, 2000). Dieback has been associated with very wet and/or dry seasons on poorly drained sites affected by human management such as tree cutting, earthworks and severe fires (Marks et al, 1975;Fagg et al, 1986;Davison, 1997;Shearer and Smith, 2000). Whether or not Phytophthora is exotic in parts of its range (Pratt and Heather, 1973), root disease is associated with human disturbance.…”

Section: Germ Theorymentioning

confidence: 97%

“…The 'Phytophthora diebacks' were mostly associated with earthworks, intensive logging and intense wildfires (Marks et al, 1975;Fagg et al, 1986;Davison, 1997). Tasmanian forests declined after their natural fire regimes were disrupted (e.g.…”

Section: Human Impactsmentioning

confidence: 99%

Eucalypt decline in Australia, and a general concept of tree decline and dieback

Jurskis¹

2005

Forest Ecology and Management

136

105

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Eucalypt dieback associated withPhytophthora cinnamomifollowing logging, wildfire and favourable rainfall

Cited by 7 publications

References 6 publications

Field survey, isolation, identification and pathogenicity of Phytophthora species associated with a Mediterranean‐type tree species

Field survey, isolation, identification and pathogenicity of Phytophthora species associated with a Mediterranean‐type tree species

Root infection by Phytophthora cinnamomi in seedlings of three oak species

Eucalypt decline in Australia, and a general concept of tree decline and dieback

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