Variation in Sterilization by<i>Deladenus proximus</i>on the Native Woodwasp,<i>Sirex nigricornis</i>, in Arkansas

Fisher, Danielle M.; Hartshorn, Jessica A.; Steinkraus, Donald C.; Galligan, Larry D.; Stephen, F. M.

doi:10.2317/0022-8567-90.2.85

Cited by 2 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, approximately a third of naturally occurring S. nigricornis were parasitized by D. proximus , ranging from 0.16 to 0.43 of individuals between sites and years (Figure 1). Previous studies conducted in five southeastern and midwestern states reported parasitism of S. nigricornis by D. proximus ranging from 0% to 44% (Fisher et al, 2017; Hartshorn, Chase, et al, 2016; Zieman et al, 2015). Thus, it appears that less than 50% of S. nigricornis are parasitized by D. proximus under natural conditions.…”

Section: Discussionmentioning

confidence: 98%

“…The average sterilization of S. nigricornis eggs by D. proximus has been over 50% in all studies to date (Table 1). When 20–30 eggs were examined per female, some parasitized females had 70–100% sterilized eggs (Fisher et al, 2017; Hartshorn, Chase, et al, 2016). In our study, where 100 eggs were examined per female (or all of the eggs, if there were fewer than 100), two females had 10% sterilization, while all others had ≥37%.…”

Section: Discussionmentioning

confidence: 99%

“…Values estimated from Fisher et al, 2017. were then dissected in Syracuse watch glasses following the methods described by Thomsen and Harding (2011). Nematodes were found within or surrounding the reproductive tissues and in the hemocoels of both males and females, and, in females, nematodes could also be within the eggs.…”

Section: Evaluation Of Parasitization and Egg Sterilization By D Prox...mentioning

confidence: 99%

“…Both of these fungi are vectored by S. nigricornis (Hajek et al, 2013). Studies of D. proximus parasitizing S. nigricornis have documented between 0% and 44% of the individuals in the population parasitized in five southeastern and midwestern states, with highly variable egg sterilization (Fisher et al, 2017; Hartshorn, Chase, et al, 2016; Zieman et al, 2015) (Table 1).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Association of the native parasitic nematode Deladenus proximus with individuals and populations of the native woodwasp Sirex nigricornis

Nouhuys

Harris

Stephen

et al. 2022

Agri and Forest Entomology

Self Cite

View full text Add to dashboard Cite

Parasitic stages of the North American native dimorphic nematode Deladenus proximus develop within larvae of the native North American siricid Sirex nigricornis and sterilize many of the eggs in adult females. Sirex nigricornis were reared from felled trees or trapped in Arkansas and Louisiana in 2017–2019 and parasitism by D. proximus was evaluated. Deladenus proximus parasitized 0.16–0.43 of S. nigricornis individuals, among sites and years. Parasitized males were smaller than healthy males, and more males were parasitized than females emerging from the same trees. Rate of parasitism increased with increasing S. nigricornis density per tree, and, as per tree density increased, so did the proportion that was male. Egg sterilization (woodwasp eggs killed and inhabited by nematodes) was partial, with an average proportion of 0.66–0.88 woodwasp eggs sterilized by D. proximus per female S. nigricornis, differing significantly by site. As the numbers of eggs in a female increased, the proportion of eggs sterilized declined. Comparing data from this study with others, a trend is reported for variable levels of egg sterilization in Sirex females, with 0 or 100% sterilization often occurring in novel host/parasite associations and partial (averages between 50% and 100%) sterilization occurring when host/parasite associations have co‐evolved.

show abstract

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Evaluation Of Parasitization and Egg Sterilization By D Prox...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Association of the native parasitic nematode Deladenus proximus with individuals and populations of the native woodwasp Sirex nigricornis

Nouhuys

Harris

Stephen

et al. 2022

Agri and Forest Entomology

Self Cite

View full text Add to dashboard Cite

show abstract

“…Hajek, data unpubl.). The native North American D. proximus usually parasitises only some of the eggs of S. nigricornis F. (Fisher et al, 2018). Parasitised female woodwasps emerge from trees, mate and then disperse to new locations where they inject a combination of viable woodwasp eggs, dead woodwasp eggs containing nematodes, nematodes in accessory gland fluid, venom, and fungus into trees (Bedding, 2009).…”

mentioning

confidence: 99%

Characterisation of the dimorphic Deladenus beddingi n. sp. and its associated woodwasp and fungus

et al. 2018

View full text Add to dashboard Cite

SummaryA new dimorphic species ofDeladenusisolated fromSirex californicusfrom Washington, USA, is described asD. beddingin. sp. Evolutionary relationships of the new species with otherDeladenusspecies were assessed using multilocus sequencing. Phylogenetic relationships derived from analyses of mtCO1and ITS showedD. beddingin. sp. to be genetically distinct from other North AmericanDeladenusparasitisingSirex. Molecular analyses indicated thatD. beddingin. sp. is a member of theD. siricidicolaspecies complex, which also includes undescribed nativeDeladenusfromSirex cyaneusandS. nitidus, andD. siricidicolafromS. noctilio. Mycophagous adults were characterised by the position of the excretory pore, which was located 32 (22-52) and 48 (38-69) μm anterior to the hemizonid in mycophagous females and males, respectively. Typologically, the new species is most similar toD. siricidicola,D. proximusandD. nitobei, but can be distinguished from these species by several morphometric traits, including the value of ratios a, b, c of the mycophagous females and males, ratio b of the infective females, and the morphology of the tail of the mycophagous females, which is narrow and gradually tapering. This novel nematode species feeds on the fungusAmylostereum chailletiiduring its mycophagous phase. Experimental results showed very little reproduction byD. beddingin. sp. when feeding onA. areolatumcompared to robust reproduction when feeding onA. chailletii.

show abstract

Variation in Sterilization byDeladenus proximuson the Native Woodwasp,Sirex nigricornis, in Arkansas

Cited by 2 publications

References 25 publications

Association of the native parasitic nematode Deladenus proximus with individuals and populations of the native woodwasp Sirex nigricornis

Association of the native parasitic nematode Deladenus proximus with individuals and populations of the native woodwasp Sirex nigricornis

Characterisation of the dimorphic Deladenus beddingi n. sp. and its associated woodwasp and fungus

Contact Info

Product

Resources

About