Effect of <i>Geosmithia morbida</i> Isolate and Temperature on Canker Development in Black Walnut

Freeland, Emily; Cranshaw, Whitney; Tisserat, Ned

doi:10.1094/php-2012-0618-01-rs

Cited by 7 publications

(6 citation statements)

References 9 publications

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“…These results support previously observed differences in canker formation among J. nigra families following inoculation with G. mórbida (7,8). All J. nigra tested developed cankers following inoculation with G. tnorbida and it was the most susceptible of the walnut species.…”

Section: Discussionsupporting

confidence: 91%

Susceptibility of Walnut and Hickory Species to Geosmithia morbida

et al. 2013

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Utley, C, Nguyen, T., Roubtsova, T, Coggeshall, M., Ford, T. N. 2013. Susceptibility of walnut and hickory species to Geosmithia mórbida. Plant Dis. 97:601-607.Thousand cankers disease (TCD) of walnut is a result of feeding in the phloem by the walnut twig beetle (WTB), Pityophthorus juglandis, and subsequent canker formation caused by Geosmithia mórbida around galleries. TCD has caused extensive morbidity and mortality to Juglans nigra in the western United States and, in 2010, was discovered in the eastern United States, where the tree is a highly valuable timber resource. WTB and G. mórbida also have been found in / regia orchards throughout major production areas in California, and the numbers of damaged trees are increasing. We tested the susceptibility of walnut and hickory species to G. mórbida in greenhouse and field studies. Carya illinoinensis, C. aquatica, and C. ovata were immune. All wal-nut species tested, including / ailantifolia, J. californica, J. cinérea, J. hindsii, J. major, J. mandshurica, J. microcarpa, J. nigra, and J. regia, developed cankers following inoculation with G. mórbida. J. nigra was the most susceptible, whereas / major, a native host of the WTB and, presumably, G. mórbida, had smaller and more superficial cankers. Canker formation differed among maternal half-sibling families of / nigra and / cinérea, indicating genetic variability in resistance to G. mórbida. Our inoculation studies with G. mórbida have corroborated many of the field observations on susceptibility of walnut and hickory species to TCD, although the ability of the WTB to successfully attack and breed in walnut is also an important component in TCD resistance.

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Section: Discussionsupporting

confidence: 91%

Susceptibility of Walnut and Hickory Species to Geosmithia morbida

et al. 2013

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“…Considering the substrate specificity of bark beetles and Geosmithia associates to their respective plant hosts [56], and the highly diverse and complex genetic structure in G. morbida that we and others [10,26,27] have observed, it is unlikely that the current TCD epidemic was a result of a new association between the WTB and G. morbida.…”

Section: Isolates and Genetic Diversitymentioning

confidence: 71%

“…Previous studies have indicated that the fungus is genetically complex [10,26]. Freeland The main objective of our study was to determine the diversity and spatial pattern of G. morbida haplotypes collected widely and intensively from both native and introduced Juglans and Pterocarya hosts in various locations in the USA.…”

Section: Acknowledgmentmentioning

confidence: 99%

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Transcriptome and secretome of two Pythium species during infection and saprophytic growth

Caballero

Tisserat

2017

Physiological and Molecular Plant Pathology

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TRANSCRIPTOME AND SECRETOME OF TWO PYTHIUM SPECIES DURING INFECTION AND SAPROPHYTIC GROWTHIn the first part of this dissertation, I describe how we obtained and analyzed the full complement of transcripts -the transcriptome-and the set of secreted proteins -the secretomeof Pythium irregulare and Pythium iwayamai isolates when they were infecting plant hosts and when they were growing saprophytically. Additionally, these two treatments were performed at two different temperatures (4˚ and 19˚C). The assembled transcriptomes were annotated, and a closer analysis of the expression profiles of transcripts coding for pathogenicity-related proteins is shown. Secreted proteins were semi-quantified and their likely functions were determined based on the annotation of the corresponding transcripts.

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“…Susceptible hosts belong to the genera Juglans and Pterocarya ( J. ailantifolia , J. californica , J. cinerea , J. hindsii , J. major , J. mandshurica , J. microcarpa , J. mollis , J. nigra , J. regia , J. hindsii × J. regia , J. nigra × J. hindsii , J. cinerea × J. ailantifolia , J. nigra × J. regia , P. fraxinifolia , P. rhoifolia and P. stenoptera ; Seybold et al ., ; Serdani et al ., ; Utley et al ., ). Furthermore, susceptibility and intensity of symptoms varies among species (with J. nigra being the most susceptible) and individuals of the same species (Tisserat et al ., ; Freeland et al ., ; Utley et al ., ).…”

Section: The Hostsmentioning

confidence: 98%

Thousand cankers disease in Europe: an overview

Montecchio¹,

Vettorazzo²,

Faccoli

2016

EPPO Bulletin

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Walnut (Juglans regia L.) is traditionally present in most European countries as an ornamental tree, and in Southern Europe in particular it is grown for both fruit and wood. Since the 1980s, to supply the increasing demand for walnut timber, large areas of southern and central Europe, from France to Hungary, have been planted with black walnut (Juglans nigra L.) to provide wood for furniture production. The fungus Geosmithia morbida and its vector Pityophthorus juglandis, causing the thousand cankers disease of walnut in the USA in the last 2 decades, were recently reported in Europe (in Italy) on both walnut species. Thousand cankers disease can have a high negative impact on the landscape and economy of many agricultural and forest areas. Following a detailed pest risk analysis performed by EPPO in 2015, both organisms were included in the EPPO A2 List of pests recommended for regulation as quarantine pests. The main biological, epidemiological and monitoring aspects of thousand cankers disease and its status in Europe are reported.

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Effect of Geosmithia morbida Isolate and Temperature on Canker Development in Black Walnut

Cited by 7 publications

References 9 publications

Susceptibility of Walnut and Hickory Species to Geosmithia morbida

Susceptibility of Walnut and Hickory Species to Geosmithia morbida

Transcriptome and secretome of two Pythium species during infection and saprophytic growth

Thousand cankers disease in Europe: an overview

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