Nematodes associated with<i>Ips cembrae</i>(Coleoptera: Curculionidae): comparison of generations, sexes and sampling methods

Grucmanová, Šárka; Holuša, Jaroslav; Čermák, Václav; Nermuť, Jiří

doi:10.1111/jen.12269

Cited by 7 publications

(10 citation statements)

References 29 publications

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“…The present study confirmed the co‐occurrence of two phoretic nematode species, T. synpapillata and M. macrospiculum , associated with RPW at all sampling sites (Troccoli et al, ) and provided information regarding other nematodes potentially associated with RPW in southern Italy. Individual insects can simultaneously harbor more than one nematode genus (Grucmanová, Holuša, Čermák, & Nermut, ; Kanzaki et al, ; Shimizu et al, ); R. palmarum and R. cruentatus are reported to host several nematode associates, including Teratorhabditis and Mononchoides spp. (Esparza‐Diaz et al, ; Kanzaki et al, , , ; Mazza et al, ; Sudhaus et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…The present study confirmed the co-occurrence of two phoretic nematode species, T. synpapillata and M. macrospiculum, associated with RPW at all sampling sites (Troccoli et al, 2015) and provided information regarding other nematodes potentially associated with RPW in southern Italy. Individual insects can simultaneously harbor more than one nematode genus (Grucmanová, Holuša, Čermák, & Nermut, 2015;Kanzaki et al, 2011;Shimizu et al, 2013); (Félix, 2006;Kanzaki & Giblin-Davis, 2018).…”

Section: Discussionmentioning

confidence: 99%

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Molecular profiling of nematode associates with Rhynchophorus ferrugineus in southern Italy

Luca

Fanelli

Oreste

et al. 2019

Ecology and Evolution

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A survey of nematodes associated with the red palm weevil Rhynchophorus ferrugineus was conducted in southern Italy in 2015 and 2016 in order to create a species inventory and obtain data about nematode biodiversity. A total of 70 insect samples (pupae and adults) were collected from infested Phoenix canariensis, Phoenix dactylifera, and Chamaerops humilis palms in three Italian Regions: sampling took place at 11 locations in Apulia, 1 in Basilicata, and 1 in Sardinia regions. Individual insects were dissected to determine nematode presence, and different nematode species were also recovered from red palm weevil cocoons collected at the sites in Apulia. Individual nematodes were molecularly identified by sequencing the ITS, D2‐D3 expansion domains of the 28SrRNA gene and the mitochondrial COI and inferring the phylogenetic relationships. The insect‐associated nematofauna identified belonged to the families Rhabditidae, Cephalobidae, and Diplogastridae. Just two nematode species, Teratorhabditis synpapillata and Mononchoides macrospiculum, were always found in association with adult insects and cocoons taken from all sampling sites. This paper reports on the biodiversity of the nematodes associated with R. ferrugineus and on current knowledge of the specific habitat of specialized and divergent entomophilic nematodes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Molecular profiling of nematode associates with Rhynchophorus ferrugineus in southern Italy

Luca

Fanelli

Oreste

et al. 2019

Ecology and Evolution

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“…This may explain why nematodes were the dominant parasite at some localities and why levels of infection were very low in the current study relative to those reported for Ips spp. (Grucmanová & Holuša 2013;Grucmanová et al 2014Grucmanová et al , 2016.…”

Section: Discussionmentioning

confidence: 99%

Extremely low infection levels of pathogens and nematodes in Trypodendron spp. (Coleoptera: Curculionidae)

Wegensteiner¹,

Lukášová²,

Vanická³

et al. 2016

Forestry Journal

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The striped ambrosia beetles Trypodendron lineatum and T. domesticum are timber forest pests in the Palearctic region and North America. Because only a few pathogens are known for Trypodendron species, the aim of this work was to determine the spectrum of pathogen species of T. lineatum, T. laeve, and T. domesticum. Trypodendron species were collected in pheromone traps at nine localities in the Czech Republic, five localities in Poland, and one locality in Austria. In total, 2,439 T. lineatum, 171 T. domesticum, and 17 T. laeve beetles were dissected and examined. Infection was found in only two of the 17 specimens of T. laeve and in only two of the 171 specimens of T. domesticum; in all four cases, the parasites were nematodes. Parasitisation of T. lineatum by nematodes was found in T. lineatum at eight localities with a mean (± SE) parasitisation level of 8.1 ± 4.7%. A Chytridiopsis sp. was detected in cells of the midgut epithelium of one T. lineatum specimen, and Gregarina sp. was detected in the midgut lumen of two T. lineatum specimens; no other pathogens were found in T. lineatum. The low infection rates and the tendency for infection by nematodes can be explained by the monogamy of Trypodendron spp. and their feeding on fungi in short galleries that are not connected to the galleries of conspecifics.

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“…Although antagonists of I. typographus is well known, their effects on beetle reproductive success have most often been studied in the laboratory, and their effects on population densities in the eld are largely unknown 26,27 . Natural enemies of I. cembrae have been infrequently studied [28][29][30] and their effects on I. cembrae abundance and fecundity are largely unknown. Pathogens, nematode parasites, and parasitoids of bark beetles are taxonomically diverse, and may, in some cases, cause serious pathological and behavioral changes in their hosts [31][32][33] .…”

Section: Introductionmentioning

confidence: 99%

Relationships between the fecundity of two bark beetle pests and the presence of antagonist

Resnerová

Schovánková

Horák

et al. 2022

Preprint

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Although previous research has documented the occurrence of antagonists of bark beetles, the studies have only evaluated individual antagonists and have not assessed the overall effect of all antagonists on adult beetles. In this study, we determined which antagonists were associated with reduction in the fecundity and maternal gallery lengths of two important species of bark beetles: Ips typographus on spruce and I. cembrae on larch. We evaluated these relationships under natural conditions by collecting maternal females in galleries and dissecting and examining their internal organs. The antagonists in the I. typographus hemolymph had the most significant negative associations with fecundity and gallery length. These antagonists were mainly nematodes and parasitoids in the hemocoel. In contrast, a positive association was found between gregarine presence and I. typographus fecundity. No antagonist was found that was likely to significantly alter I. cembrae fecundity or maternal gallery length. Our study provides the first comprehensive assessment of antagonists that may have the potential to reduce the fecundity and thereby reduce the outbreaks of these bark beetles.

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Nematodes associated withIps cembrae(Coleoptera: Curculionidae): comparison of generations, sexes and sampling methods

Cited by 7 publications

References 29 publications

Molecular profiling of nematode associates with Rhynchophorus ferrugineus in southern Italy

Molecular profiling of nematode associates with Rhynchophorus ferrugineus in southern Italy

Extremely low infection levels of pathogens and nematodes in Trypodendron spp. (Coleoptera: Curculionidae)

Relationships between the fecundity of two bark beetle pests and the presence of antagonist

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