Association of Geosmithia fungi (Ascomycota: Hypocreales) with pine- and spruce-infesting bark beetles in Poland

Jankowiak, Robert; Kolařík, Miroslav; Bilański, Piotr

doi:10.1016/j.funeco.2014.04.002

Cited by 23 publications

(28 citation statements)

References 20 publications

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“…with various tree hosts and vectors are relatively well known in Europe. In general, Geosmithia is more frequent on hardwoods than on conifers, although Geosmithia is commonly found in association with pine-infesting bark beetles in Central Europe [2,4,5,6,9,12,15,17,18]. Our survey demonstrated that Geosmithia fungi are also regular associates of phloembreeding bark beetles on European silver fir.…”

Section: Discussionmentioning

confidence: 57%

“…The Ophiostomatales associated with many conifer-feeding beetles have been well characterized in Poland (e.g., [20][21][22][23][24][25][26][27][28]). Relationships between Geosmithia fungi and pine-and spruce-infesting bark beetles are also relatively well known in Poland [9,12,17,19]. The results of these studies show that Geosmithia fungi develop stable symbiotic relationships with different bark beetle species, and resemble ophiostomatoid fungi in their host and vector affinities and life strategy evolution.…”

Section: Introductionmentioning

confidence: 85%

“…Bark-and wood-boring beetles (Coleoptera) are commonly associated with various species of ascomycetes in three orders: Ophiostomatales, Microascales, and Hypocreales [1,2]. Members of the Hypocreales are common in all types of moist forests [3], however, only Geosmithia fungi that produce Penicillium-like conidiophores are associates of bark beetles on hardwood and conifer trees worldwide [4][5][6][7][8][9][10][11][12][13][14][15][16]. The bark beetle-Geosmithia relationships vary, ranging from specialists with a limited range of vectors to generalists recorded with numerous vectors [4,6,9,11].…”

Section: Introductionmentioning

confidence: 99%

“…The bark beetle-Geosmithia relationships vary, ranging from specialists with a limited range of vectors to generalists recorded with numerous vectors [4,6,9,11]. On Pinaceae, the typical vectors of Geosmithia are bark beetles infesting Pinus sylvestris L. The pineassociated Geosmithia are a group of specialists living only on the Pinaceae [9,12,17]. Among Geosmithia species, only G. morbida M. Kolařík, Freeland, C. Utley & Tisserat has been considered a highly aggressive pathogen of walnuts in the USA [7] and Europe [18].…”

Section: Introductionmentioning

confidence: 99%

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Geosmithia species associated with fir-infesting beetles in Poland

Jankowiak

Bilański

2018

Acta Mycol

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Geosmithia species (Ascomycota: Hypocreales) are common ectosymbionts of scolytine bark and ambrosia beetles that feed on coniferous and deciduous trees in different forest ecosystems. Geosmithia morbida is the canker pathogen that causes extensive mortality of Juglans nigra. Because little is known regarding the Geosmithia species on European silver fir (Abies alba), we have investigated the diversity and abundance of these fungi associated with insects infesting European silver fir in Poland. Samples associated with eight beetle species were collected from three fir forests. Fungi were isolated from beetles and galleries. Isolates were identified based on morphological characteristics, DNA sequence comparison for three gene regions (ITS, ßT, TEF1-α), and phylogenetic analyses. Geosmithia was detected in 33% of the total 531 beetle samples obtained from A. alba. Two undescribed species of Geosmithia were distinguished, Geosmithia sp. 9 and Geosmithia sp. 16. Associations of Pityokteines spp. with Geosmithia fungi were recorded for the first time. Pityokteines vorontzowi and Pityophthorus pityographus appear to be regular vectors for Geosmithia sp. 9 and Geosmithia sp. 16, respectively. Pityokteines curvidens and Cryphalus piceae were associated with Geosmitha sp. 9 at lower frequencies.

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Section: Discussionmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geosmithia species associated with fir-infesting beetles in Poland

Jankowiak

Bilański

2018

Acta Mycol

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“…It is possible that frontalin is produced by symbiotic fungi which could attract the beetles. P. poligraphus is a vector for several fungi (Jankowiak, Kolarik, & Bilanski, 2014;Kirschner, Begerow, & Oberwinkler, 2001;Rollins, Jones, Krokene, Solheim, & Blackwell, 2001), and it has been reported that fungal symbionts of bark beetles produce volatiles which can increase the beetles' attraction to attacked trees (Kandasamy et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Optimizing the attractiveness of pheromone baits used for trapping the four‐eyed spruce bark beetle Polygraphus poligraphus

Viklund

Rahmani

Bång

et al. 2019

J Applied Entomology

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Bark beetles have caused extensive damage to forests in central Sweden during the past decade, and the four‐eyed spruce bark beetle, Polygraphus poligraphus, seems to be involved. However, its role in these bark beetle outbreaks is still not clear. The purpose of this study was to develop an efficient pheromone bait for P. poligraphus, which would make it possible to study the species more carefully and thereby contribute to protect exposed forests in an environmentally friendly way. Three field studies were conducted in 2015, 2016 and 2018 in Medelpad, county of Västernorrland, Sweden. The pheromone of P. poligraphus, (−)‐terpinen‐4‐ol, was tested at different release rates and in different enantiomeric purities, to find the most attractive formulation for the beetles. It was also tested in combination with racemic frontalin, a compound which has previously been shown to produce a synergistic effect together with (−)‐terpinen‐4‐ol of low enantiomeric purity; 52% ee. Other compounds, chosen based on responses from electroantennographic studies, were also tested in an attempt to find additional attractants and repellents for P. poligraphus. The most attractive treatment tested was enantiomerically pure (−)‐terpinen‐4‐ol (99% ee). When the enantiomeric purity was lower (50% ee), the trap catches was lowered to levels comparable to the catches for unbaited control traps. A strong synergistic effect with frontalin was observed for (−)‐terpinen‐4‐ol of low enantiomeric purity (50% ee) but not for the enantiomerically pure compound (99% ee). The release rate of (−)‐terpinen‐4‐ol (99% ee) was shown to be an important factor. For the combination of frontalin and (−)‐terpinen‐4‐ol (50% ee), the attraction seemed strongest when (−)‐terpinen‐4‐ol was released at a higher rate than frontalin. An interesting and novel result was that a repellent compound, α‐terpineol, was identified in our studies. Our results from field studies and electroantennography recordings also indicate that (+)‐terpinen‐4‐ol is a repellent for P. poligraphus.

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