Diseases of Black Wattle in South Africa—A Review

Roux, Jolanda; Kemp, Gabré; Wingfield, M.J.

doi:10.1080/00382167.1995.9629876

Cited by 20 publications

(24 citation statements)

References 11 publications

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“…gummosis (Roux, Kemp, & Wingfield, 1995;Roux & Wingfield, 1997;Zeijlemaker, 1971;Zeiljemaker, 1967). Black-butt does not kill older trees but reduces bark yield.…”

mentioning

confidence: 99%

Susceptibility of Eucalyptus grandis and Acacia mearnsii seedlings to five Phytophthora species common in South African plantations

et al. 2019

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Eucalyptus grandis and its hybrids, as well as Acacia mearnsii, are important non‐native trees commonly propagated for forestry purposes in South Africa. In this study, we conducted pathogenicity trials to assess the relative importance of five commonly isolated Phytophthora spp. (Phytophthora alticola, P. cinnamomi, P. frigida, P. multivora and P. nicotianae) from the plantation environment on E. grandis and A. mearnsii seedlings. Overall E. grandis was more susceptible to the tested Phytophthora spp. than A. mearnsii. Phytophthora cinnamomi was the only pathogen that had a significant negative effect on both the host tree species, leading to a reduction in root and shoot weight as well as to death in the case of E. grandis. Phytophthora alticola and P. nicotianae exclusively affected E. grandis and A. mearnsii, respectively. This study updated the current knowledge on the pathogenicity of Phytophthora spp. on two important non‐native commercially propagated tree species from South Africa.

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“…gummosis (Roux, Kemp, & Wingfield, 1995;Roux & Wingfield, 1997;Zeijlemaker, 1971;Zeiljemaker, 1967). Black-butt does not kill older trees but reduces bark yield.…”

mentioning

confidence: 99%

Susceptibility of Eucalyptus grandis and Acacia mearnsii seedlings to five Phytophthora species common in South African plantations

et al. 2019

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“…Using data from inventories carried out in plantations over many decades (Wingfield et al , 2008; Roux et al , 2012), it appears that eucalypts had the highest number of native and non-native insect pests and pathogens affecting their health ( n = 45; Fig. 1A), followed by pines ( n = 28) and acacias ( n = 25).…”

Section: Historic and Novel Biotic Interactions On Non-native Eucalypmentioning

confidence: 99%

“…These establishment pests typically feed on roots of saplings, and also ring-bark the soft tissue of the young plants as soon as they are planted into the landscape (Roux et al , 2012). For these insects to become significant pests, saplings must occur in soils where the insects occur in high density.…”

Section: Loss Of Enemy-free Space In Non-native Treesmentioning

confidence: 99%

Ecological disequilibrium drives insect pest and pathogen accumulation in non-native trees

Crous¹,

Burgess²,

Roux³

et al. 2016

AoB PLANTS

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Non-native plant invasions represent ecological disequilibrium situations, that is, the immediate breakdown of historically co-evolved interactions once introduced into novel environments. Globalization has led to increased transfer in organisms between countries. Native enemies also undergo host expansions onto non-native plants. Ecological disequilibrium conditions can thus be expected to change unpredictably over time. By retrospectively analysing the insect pest and pathogen accumulation on established non-native trees in South Africa, we review the eco-evolutionary background that may help to explain and predict variation in ecological disequilibrium conditions in non-native trees.

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“…Such wounds can arise from wind (R oux et al. 2007), hail damage (R oux et al. 1995), growth cracks (T eviotdale and H arper 1991), insect and animal feeding (W alter 1946; B retz 1952; D e V ay et al.…”

Section: Introductionmentioning

confidence: 99%

“…Infection of A. mearnsii by C. albifundus has been associated with hail wounds, as well as with pruning wounds on these trees (R oux et al. 1995).…”

Section: Introductionmentioning

confidence: 99%

Factors influencing infection of Acacia mearnsii by the wilt pathogen Ceratocystis albifundus in South Africa

et al. 2010

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It is well known that species of Ceratocystis, which cause canker and wilt diseases on trees, require wounds for infection. In this regard, a number of physical and environmental factors influence the success of wound colonization by these fungi. The aim of this study was to consider the influence of wound age, stem diameter and colonization of wounds by Ophiostoma quercus on the success of infection by Ceratocystis albifundus, an important wilt pathogen of Acacia mearnsii in southern and eastern Africa, under field conditions. This was performed by doing controlled inoculations on Acacia mearnsii trees, of different diameters, with C. albifundus at different time intervals after wounding and after pre-inoculation of wounds with O. quercus at the time of wounding. The success of infection by C. albifundus decreased significantly from 8 h after wounding and was higher on stems of greater diameter. Pre-infection of wounds by O. quercus reduced the infection success of C. albifundus. The overall results showed that managing wounds created during forestry operations by treating wounds with naturally occurring, non-virulent fungi, such as O. quercus, could reduce the prevalence of infections by C. albifundus.

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Diseases of Black Wattle in South Africa—A Review

Cited by 20 publications

References 11 publications

Susceptibility of Eucalyptus grandis and Acacia mearnsii seedlings to five Phytophthora species common in South African plantations

Susceptibility of Eucalyptus grandis and Acacia mearnsii seedlings to five Phytophthora species common in South African plantations

Ecological disequilibrium drives insect pest and pathogen accumulation in non-native trees

Factors influencing infection of Acacia mearnsii by the wilt pathogen Ceratocystis albifundus in South Africa

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