Impact of the parasitoid Aphelinus certus on soybean aphid populations

Kaser, Joe M.; Heimpel, George E.

doi:10.1016/j.biocontrol.2018.08.014

Cited by 24 publications

(40 citation statements)

References 68 publications

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“…Natural enemies provide biological control services in agroecosystems (Landis et al ., ; Biondi et al ., ; Perović et al ., ). Aphids are important pests in crop systems (Simon & Peccoud, ), and a single species of aphid is often associated with a wide range of natural enemies including predators and parasitoids (Boivin et al ., ; Riddick, ; Bannerman et al ., ; Kaser & Heimpel, ). Biological control systems that include both predators and parasitoids play important roles in aphid suppression (Snyder & Ives, ; Straub & Snyder, ; Gontijo et al ., ; Rocca & Messelink, ).…”

Section: Introductionmentioning

confidence: 99%

Effects of mummy consumption on fitness and oviposition site selection on Harmonia axyridis

Yu¹,

Feng²,

Feng³

et al. 2019

Insect Science

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Intraguild predation (IGP) has been commonly reported between predators and parasitoids used as biological control agents as predators consuming parasitoids within their hosts. However, the effect of parasitoid–mummy consumption on the fitness of the predator and subsequent oviposition site selection have not been well studied. In our study, we conducted two laboratory experiments to examine the influence of Aphidius gifuensis Ashmead (Hymenoptera: Braconidae) mummies as prey on fitness and subsequently oviposition site selection of Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae). Results indicate that when H. axyridis was reared on A. gifuensis mummies only, its larval development was prolonged, and body weight of the 4th instar larvae and newly emerged adults, and fecundity decreased. Moreover, H. axyridis did not exhibit oviposition preference on plants infested with unparasitized aphids or aphids parasitized for shorter than 9 days. However, compared with plants with mummies (parasitized ≥9 days), H. axyridis laid more eggs on plants with unparasitized aphids. In contrast, H. axyridis previously fed with A. gifuensis mummies did not show a significant oviposition preference between plants with unparasitized aphids and those with mummies (parasitized ≥9 days). Overall, our results suggest that mummy consumption reduced the fitness of H. axyridis. Although H. axyridis avoided laying eggs on plants with A. gifuensis mummies, prior feeding experience on A. gifuensis mummies could alter the oviposition site preference. Thus, in biological control practice, prior feeding experience of H. axyridis should be carefully considered for reduction of IGP and increase of fitness of H. axyridis on A. gifuensis.

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Section: Introductionmentioning

confidence: 99%

Effects of mummy consumption on fitness and oviposition site selection on Harmonia axyridis

Yu¹,

Feng²,

Feng³

et al. 2019

Insect Science

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“…Soybean aphid is limited by a suite of natural enemies in its native range [57, 58], and, in North America, Harmonia axyridis , Coccinella septempunctata , Orius insidiosus (debatably), and A . certus have been identified as important predators in certain landscapes [33, 53, 59–64].…”

Section: Discussionmentioning

confidence: 99%

“…Recent work on A . certus in Saint Paul, Minnesota, suggests that this parasitoid may be able to maintain soybean aphid populations below the economic threshold of 250 aphids per plant (the pest density at which management practices should be applied) [33], although a different study in the Montérégie area of Québec, Canada, found that A . certus only decreased peak aphid population densities (and cumulative aphid-days) by 1–7%, possibly due to low early-season parasitism rates [34].…”

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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“…Predators, such as Coccinellidae and Anthocoridae, contribute to suppression of A. glycines . In addition, the parasitoid Aphelinus certus Yasnosh (Hymenoptera: Aphelinidae) is becoming a more prominent natural enemy of A. glycines in the North Central Region of the USA . Insecticides commonly used for management of A. glycines have relatively broad‐spectrum activity and are detrimental to predators and parasitoids .…”

Section: Introductionmentioning

confidence: 99%

“…1,16 In addition, the parasitoid Aphelinus certus Yasnosh (Hymenoptera: Aphelinidae) is becoming a more prominent natural enemy of A. glycines in the North Central Region of the USA. [17][18][19] Insecticides commonly used for management of A. glycines have relatively broad-spectrum activity and are detrimental to predators and parasitoids. [20][21][22][23] In contrast, conservation biological control using selective insecticides (i.e.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of afidopyropen against soybean aphid (Hemiptera: Aphididae) and toxicity to natural enemies

Koch

Queiroz

Aita

et al. 2019

Pest Management Science

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BACKGROUND Soybean aphid, Aphis glycines (Hemiptera: Aphididae), remains the most significant soybean insect pest in the North Central Region of the USA. The sustainability of reliance on only a few insecticide groups for this pest is questionable. We evaluate afidopyropen, a novel pyropene insecticide (Group 9D), for efficacy against A. glycines in field and greenhouse experiments and toxicity to common natural enemies in laboratory experiments. RESULTS Across 4 site‐years of field experiments and a greenhouse experiment, afidopyropen reduced A. glycines populations similar to commonly used broad‐spectrum [i.e. lambda‐cyhalothrin (Group 3A) and chlorpyrifos (Group 1B)] insecticides and potential selective insecticides [i.e. sulfoxaflor (Group 4C) and flupyradifurone (Group 4D)]. In the greenhouse, however, A. glycines mortality was delayed slightly for afidopyropen compared to the other insecticides. In laboratory experiments with natural enemies of A. glycines, afidopyropen was not toxic to adult or third instar Hippodamia convergens (Coleoptera: Coccinellidae) or adult Orius insidiosus (Hemiptera: Anthocoridae), and was only moderately toxic to Aphelinus certus (Hymenoptera: Aphelinidae). CONCLUSION Afidopyropen is effective against A. glycines and relatively non‐toxic to natural enemies, and appears to be an effective option for integrated pest management and insecticide resistance management programs for A. glycines. © 2019 Society of Chemical Industry

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Impact of the parasitoid Aphelinus certus on soybean aphid populations

Cited by 24 publications

References 68 publications

Effects of mummy consumption on fitness and oviposition site selection on Harmonia axyridis

Effects of mummy consumption on fitness and oviposition site selection on Harmonia axyridis

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

Efficacy of afidopyropen against soybean aphid (Hemiptera: Aphididae) and toxicity to natural enemies

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