Host specificity of Aphelinus species considered for introduction to control Diuraphis noxia

Hopper, Keith R.; Lanier, Kathryn A.; Rhoades, Joshua H.; Coutinot, D.; Mercadier, Guy; Ramualde, Nathalie; Roché, M. O. García; Woolley, James B.; Heraty, John M.

doi:10.1016/j.biocontrol.2017.01.006

Cited by 18 publications

(8 citation statements)

References 34 publications

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“…If feeding on host hemolymph, females insert the ovipositor for about five min, which usually leads to quick host death. In contrast, an oviposition sting lasts about one min (Hopper, Lanier, Rhoades, Coutinot, et al, 2017). To control for host feeding, only aphids stung for less than one min were selected as replicates.…”

Section: Methodsmentioning

confidence: 99%

Aphelinus nigritus‐induced transgenerational fecundity compensation in parasitized Melanaphis sorghi

Wright

Lei

Zhu‐Salzman

et al. 2022

Ecological Entomology

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Aphids adopt many defensive strategies against natural enemies. While immediate strategies like emitting alarm pheromones or producing secretions are often researched, fewer studies have assessed long‐term defences that include physiological adaptive responses affecting aphid reproduction. Fecundity compensation is a post‐wounding increase in host reproduction, which benefits the offspring of wounded or parasitized insects. Though fecundity compensation can be expressed by individuals experiencing natural enemy attacks, it can also be transgenerational, wherein the offspring of wounded or parasitized mothers reproduce more than the offspring of unaffected mothers. The possibility of fecundity compensation was tested on laboratory populations of the sorghum aphid (SA), Melanaphis sorghi (Hemiptera: Aphididae), in response to wounding from a needle puncture or sting by Aphelinus nigritus Howard (Hymenoptera: Aphelinidae). No evidence of reproductive compensation was found among needle‐wounded, stung and mummified (successfully parasitized), or stung but not mummified SAs in the parental generation, nor in the F1 generation of needle‐wounded or stung but not mummified aphids. However, transgenerational fecundity compensation was observed in F1 daughters of mummified F0 mothers, though this effect did not occur in the F2 generation. At the molecular level, changes were not detected in the expression of DNA methylation and histone modification genes that potentially mediated transgenerational fecundity compensation in SAs stung by A. nigritus, regardless of whether aphids were successfully parasitized. As SA is a cereal aphid pest, the possibility of fecundity compensation should be tested when assessing the suitability of certain parasitoids as biological control agents.

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Section: Methodsmentioning

confidence: 99%

Aphelinus nigritus‐induced transgenerational fecundity compensation in parasitized Melanaphis sorghi

Wright

Lei

Zhu‐Salzman

et al. 2022

Ecological Entomology

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“…However, A . certus was determined to be an unsuitable classical biological control agent because it parasitized a broad range of aphid species during tests in quarantine [29, 30]. In or before 2005, A .…”

Section: Methodsmentioning

confidence: 99%

A matrix model describing host–parasitoid population dynamics: The case of Aphelinus certus and soybean aphid

Miksanek

Heimpel

2019

PLoS ONE

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Integrating elements from life tables into population models within a matrix framework has been an underutilized method of describing host–parasitoid population dynamics. This type of modeling is useful in describing demographically-structured populations and in identifying points in the host developmental timeline susceptible to parasitic attack. We apply this approach to investigate the effect of parasitism by the Asian parasitoid Aphelinus certus on its host, the soybean aphid ( Aphis glycines ). We present a matrix population model with coupled equations that are analogous to a Nicholson–Bailey model. To parameterize the model, we conducted several bioassays outlining host and parasitoid life history and supplemented these studies with data obtained from the literature. Analysis of the model suggests that, at a parasitism rate of 0.21 d −1 , A . certus is capable of maintaining aphid densities below economically damaging levels in 31.0% of simulations. Several parameters—parasitoid lifespan, colonization timeline, host developmental stage, and mean daily temperature—were also shown to markedly influence the overall dynamics of the system. These results suggest that A . certus might provide a valuable service in agroecosystems by suppressing soybean aphid populations at relatively low levels of parasitism. Our results also support the use of A . certus within a dynamic action threshold framework in order to maximize the value of biological control in pest management programs.

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“…Importantly, Hopper et al . () demonstrated that A. varipes does not attack D. noxia , unlike A. hordei , which has established on R. padi and R. maidis within Australia (Waterhouse & Sands ).…”

Section: Managementmentioning

confidence: 99%

Biology, ecology and management of Diuraphis noxia (Hemiptera: Aphididae) in Australia

et al. 2020

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The Russian wheat aphid, Diuraphis noxia (Mordvilko ex Kurdjumov), is one of the world's most economically important pests of grain crops and has been recorded from at least 140 grass species within Poaceae. It has rapidly dispersed from its native origin of Central Asia into most major grain-producing regions of the world including Africa, Asia, Europe, the Middle East, North America and South America. Diuraphis noxia was first found in Australia in a wheat crop in the mid-north of South Australia in May 2016. Since then, D. noxia has been recorded throughout grain-growing regions of South Australia, Victoria, New South Wales and Tasmania. The distribution will continue to expand, with climatic suitability modelling suggesting D. noxia can persist in all key grain regions, including large parts of Western Australia and Queensland. Australian populations of D. noxia appear to be anholocyclic, with no sexual stages being observed. The aphids can reproduce year round as long as host plants are available. Australian farmers have generally adopted prophylactic insecticide seed treatments and/or foliar sprays to manage D. noxia. Research is required to fully understand yield impacts, host preferences and host plant resistance associated with D. noxia. Cultural control through managing alternate host plants over summer, agronomic crop management, biological control and developments in host plant resistance should provide considerable future benefits. Key wordsexotic pest, invasion, management, review, Russian wheat aphid. DESCRIPTIONOriginally named Brachycolus noxius, the Russian wheat aphid (now known as Diuraphis noxia) was first recognised as a separate species by Mordvilko in a paper by Kurdjumov (1913). Detailed descriptions of D. noxia have been provided by Blackman and Eastop (1984) and Stoetzel (1987). In brief, D. noxia has an elongated, spindle-shaped body, with the tips of the legs and distal third of the (distinctively short) antennae black. The wings *pumina@unimelb.edu.au

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Host specificity of Aphelinus species considered for introduction to control Diuraphis noxia

Cited by 18 publications

References 34 publications

Aphelinus nigritus‐induced transgenerational fecundity compensation in parasitized Melanaphis sorghi

Aphelinus nigritus‐induced transgenerational fecundity compensation in parasitized Melanaphis sorghi

A matrix model describing host–parasitoid population dynamics: The case of Aphelinus certus and soybean aphid

Biology, ecology and management of Diuraphis noxia (Hemiptera: Aphididae) in Australia

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