Geosmithia species in southeastern USA and their affinity to beetle vectors and tree hosts

Huang, Yin-Tse; Skelton, James; Johnson, Andrew J.; Kolařík, Miroslav; Hulcr, Jiří

doi:10.1016/j.funeco.2019.02.005

Cited by 16 publications

(35 citation statements)

References 46 publications

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“…TEF‐1a sequences of Geosmithia spp. were identical with some published sequences in phylogenetic analysis (Huang et al., 2019) (Figure S1, Table S1). One Geosmithia fungus from Shanghai and Jiangxi formed monophyly with G .…”

Section: Resultssupporting

confidence: 84%

“…Because BLAST analysis indicated that 20 isolates were species of Geosmithia , partial gene sequences of TEF‐1a for these isolates were amplified using the primers 983F/2218R (Schoch et al., 2009). For further identification of Geosmithia isolates, those TEF‐1a sequences were used to establish a dataset for phylogenetic analysis; the dataset included both the isolates obtained in the current study and reference isolates representing other species of Geosmithia (Huang et al., 2019) (Table S1). The alignments were conducted using MAFFT (Katoh et al., 2017).…”

Section: Methodsmentioning

confidence: 99%

“…Although Huang et al. (2019) found Geosmithia brunnea associated with beetle vectors on L. styraciflua in Florida, little direct evidence exists on the relative importance of those fungi and beetle's behaviour on the health of host plants.…”

Section: Introductionmentioning

confidence: 99%

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Biology and associated fungi of an emerging bark beetle pest, the sweetgum inscriber Acanthotomicus suncei (Coleoptera: Curculionidae)

Gao

Wang

et al. 2021

J Applied Entomology

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The sweetgum inscriber (SI) Acanthotomicus suncei Cognato is an emerging bark beetle pest that seriously damages American sweetgum trees (Liquidambar styraciflua) and Chinese sweetgum trees (L. formosana) in China. Since 2013, SI has killed more than 30,000 sweetgum trees in Shanghai and adjacent areas. In Shanghai, SI was observed to emerge from infested wood between April–September and exhibited two generations per year. Both the flying populations and those in colonized logs were female‐biased. After the parental adult initiates a gallery, the emergence of new adults required 73.4 ± 0.7 days at 30°C and 163.5 ± 0.9 days at 20°C. SI could not sustain population development at constant temperatures ≤15°C. The fungi Geosmithia spp. and Phaeoacremonium tuscanum were common associates of SI. The results suggest that SI has a long flight period, and its development is sensitive to low temperatures. Fungi associated with SI were not pathogenic to American sweetgum trees, but their presence may indirectly increase the probability of tree mortality. Our findings contribute to the prevention and control of this important emerging bark beetle pest.

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Section: Resultssupporting

confidence: 84%

Section: Methodsmentioning

confidence: 99%

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Biology and associated fungi of an emerging bark beetle pest, the sweetgum inscriber Acanthotomicus suncei (Coleoptera: Curculionidae)

Gao

Wang

et al. 2021

J Applied Entomology

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“…3 and Geosmithia sp. 23 which are know from various bark beetle hosts in Europa, USA and Seychelles (Kolařík et al 2007(Kolařík et al , 2008(Kolařík et al , 2017Huang et al 2017Huang et al , 2019, and further study need to clarify among these three lineages. In this study, we isolated G. pulverea from A. gracilipes, Gne.…”

Section: Discussionmentioning

confidence: 99%

Geosmithia Species Associated With Bark Beetles From Southern China, With the Description of Four New Species

Zhang

Dai

et al. 2021

Preprint

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Fungi of the genus Geosmithia are frequently associated with bark beetles that feed on phloem on various woody hosts. Most studies on Geosmithia were carried out in North and South America and Europe, with only two species were reported from Taiwan, China. The aim of this study was to investigate the diversity of Geosmithia species in southern China. Field surveys in Guangdong, Guangxi, Hunan, Jiangxi and Shanghai yielded a total of 76 fungal isolates from six beetle species. Isolates were grouped based on morphology. The ITS, β-tubulin and elongation factor 1-α gene regions of representatives of each group were sequenced. Phylogenetic trees were constructed based on those sequences. In total five species were identified, with one previously described species G. putterillii and four new species which were described as G. jiulianshanensis, G. jiangxiensis, G. formosana, and G. pulverea (Geosmithia sp. 3 and Geosmithia sp. 23) sp. nov., in this paper.

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“…Therefore, it is possible that TCD has been repeatedly introduced into the eastern United States (Haun et al, 2010); and/or the fungus may be endemic nationwide as suggested by the widespread presence of Geosmithia spp. in other parts of the United States (Huang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Eastern Black Walnut (Juglans nigra L.) Originating From Native Range Varies in Their Response to Inoculation With Geosmithia morbida

Sitz¹,

Luna²,

Caballero³

et al. 2021

Front. For. Glob. Change

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Thousand cankers disease (TCD) is caused by the walnut twig beetle (Pityophthorus juglandis) vectoring the fungal canker pathogen Geosmithia morbida, which can result in severe dieback and eventual death to species of walnut (Juglans spp.) and wingnut (Pterocarya spp.). This disease is most devastating to the highly valued species J. nigra (black walnut). This species is primarily grown and harvested for timber production in the Central Hardwood Region of the United States, which comprises part of its native range. Management options for TCD are limited; therefore, finding resistant genotypes is needed. Initial studies on black walnut susceptibility to G. morbida documented some genetic variation and suggested potential resistance. Furthermore, G. morbida is thought to be native to the United States, which may have allowed for co-evolution. To capture the representative genetic diversity and screen for resistance to G. morbida, J. nigra families were collected from across the native range. These wild trees, in conjunction with seedlings developed in a black walnut timber improvement program, were planted in a common garden in Fort Collins, Colorado and repeatedly inoculated with G. morbida over the course of four years and three growing seasons. Improved seedlings exhibited larger cankered areas than wild J. nigra of the same provenance. Cankers induced by G. morbida in wild germplasm were smaller on J. nigra collected from the western and central portions of the native range compared to those collected from the eastern portion. Although trees from the western and central part of the range still incurred cankers, our findings indicate that variation in genetic resistance to G. morbida is present in black walnut. This study was performed with G. morbida independent of the walnut twig beetle, but our results suggest the limited G. morbida resistance observed in J. nigra will prevent the full compromise of black walnut to TCD. Results from this study should be taken into consideration in future black walnut breeding programs.

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Geosmithia species in southeastern USA and their affinity to beetle vectors and tree hosts

Cited by 16 publications

References 46 publications

Biology and associated fungi of an emerging bark beetle pest, the sweetgum inscriber Acanthotomicus suncei (Coleoptera: Curculionidae)

Biology and associated fungi of an emerging bark beetle pest, the sweetgum inscriber Acanthotomicus suncei (Coleoptera: Curculionidae)

Geosmithia Species Associated With Bark Beetles From Southern China, With the Description of Four New Species

Eastern Black Walnut (Juglans nigra L.) Originating From Native Range Varies in Their Response to Inoculation With Geosmithia morbida

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