Cankers Caused by<i>Botryodiplodia gallae</i>Associated with Oak Sprout Mortality in Michigan

Croghan, Catherine F.; Robbins, Katherine S.

doi:10.1094/pd-70-76

Cited by 3 publications

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“…Twig and branch cankering of oak caused by Diplodia have a longdocumented history in the eastern United States (Carter, 1941;Croghan & Robbins, 1986;Ingram, 1914;Munck et al, 2017;Schmidt & Fergus, 1965;Sinclair & Lyon, 2005;Stevens, 1933).…”

Section: Discussionmentioning

confidence: 99%

“…Twig and branch cankering of oak caused by Diplodia have a long‐documented history in the eastern United States (Carter, 1941; Croghan & Robbins, 1986; Ingram, 1914; Munck et al, 2017; Schmidt & Fergus, 1965; Sinclair & Lyon, 2005; Stevens, 1933). Many of these outbreaks are linked to periods of stress, such as drought and insect defoliation (Sinclair & Lyon, 2005).…”

Section: Discussionmentioning

confidence: 99%

“…in Pennsylvania (Schmidt & Fergus, 1965). In Michigan, cankering from B. gallae was believed to be the primary cause of mortality for oak coppice sprouts across stands that were harvested between 1960 and 1980 (Croghan & Robbins, 1986). More recently, B. gallae was briefly mentioned by Sinclair & Lyon (p. 124; as one of the anamorphic states of Botryosphaeria quercuum (Schwein.)…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diplodia twig canker (Diplodia gallae) of northern red oak (Quercus rubra) in the northeastern United States

et al. 2023

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The 2015–2018 outbreak of spongy moth (Lymantria dispar) in southern New England initiated a severe oak decline and mortality event. While defoliation was a primary driver, increased secondary pest and pathogen activity contributed to decline and death. Following this large defoliation event, Diplodia was frequently recovered from northern red oaks (Quercus rubra) with serious outbreaks of twig cankering. Given the many recent reports of Diplodia corticola on oak in eastern North America, it was presumed to be the causal agent. To confirm, a limited survey was conducted from five states in the region (Maine, Massachusetts, New Hampshire, New York, and Vermont). Based on ITS, tef1 and tub2 sequences generated from 28 isolates collected primarily from northern red oak, Diplodia gallae, two potentially novel Diplodia species and Diplodia sapinea were identified. Surprisingly, D. corticola was not found in this study. ITS sequences alone failed to discriminate among isolates of D. gallae and D. corticola, creating uncertainty over previous reports of D. corticola in eastern North America. Only a combined ITS + tef1 dataset successfully distinguished D. gallae and D. corticola along with two other closely related species that also occur on oak (Diplodia quercicola and Diplodia quercivora). Additional cankering and endophytic fungi (Coryneum, Dendrostoma, Gnomoniopsis, Pestalotiopsis and Tubakia) were also found on symptomatic oaks in the region. Identification of Diplodia isolates from non‐Quercus hosts also detected Diplodia neojuniperi on Juniperus chinensis and Microbiota decussata, which has not been reported previously in North America.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diplodia twig canker (Diplodia gallae) of northern red oak (Quercus rubra) in the northeastern United States

et al. 2023

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Fungal pathogens associated with branch and trunk cankers of nut crops in Iran

et al. 2020

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Branch and trunk canker diseases have become prevalent on nut crops in Iran. During 2015 to 2018, extensive field surveys were conducted on 58 almond, 43 pistachio and 80 walnut orchards in Iran to study fungal pathogens associated with symptomatic trees. One hundred and fifty-six representative fungal isolates were selected and identified based on morphological characteristics and by phylogenetic comparison of DNA sequence data. Fungal species found were Collophorina hispanica, Pleurostoma richardsiae, nine species of Phaeoacremonium (namely P. angustius, P.

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Oak overstory/reproduction relations in two xeric ecosystems in Michigan

Johnson

1992

Forest Ecology and Management

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Cankers Caused byBotryodiplodia gallaeAssociated with Oak Sprout Mortality in Michigan

Cited by 3 publications

References 0 publications

Diplodia twig canker (Diplodia gallae) of northern red oak (Quercus rubra) in the northeastern United States

Diplodia twig canker (Diplodia gallae) of northern red oak (Quercus rubra) in the northeastern United States

Fungal pathogens associated with branch and trunk cankers of nut crops in Iran

Oak overstory/reproduction relations in two xeric ecosystems in Michigan

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