Incorporating natural enemy units into a dynamic action threshold for the soybean aphid,<i>Aphis glycines</i>(Homoptera: Aphididae)

Hallett, Rebecca H.; Bahlai, Christine A.; Xue, Yingen; Schaafsma, A. W.

doi:10.1002/ps.3674

Cited by 43 publications

(44 citation statements)

References 56 publications

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“…Some have found no statistically significant effects (Al-Deeb et al, 2003), some a mix of null and negative effects (Albajes, Lopez & Pons, 2003), and others more consistent negative effects (Hallett et al, 2014). Some of this variability may be related to the small sample sizes of most field studies, which limits their statistical power.…”

Section: Introductionmentioning

confidence: 99%

Meta-analysis reveals that seed-applied neonicotinoids and pyrethroids have similar negative effects on abundance of arthropod natural enemies

Douglas

Tooker

2016

PeerJ

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BackgroundSeed-applied neonicotinoids are widely used in agriculture, yet their effects on non-target species remain incompletely understood. One important group of non-target species is arthropod natural enemies (predators and parasitoids), which contribute considerably to suppression of crop pests. We hypothesized that seed-applied neonicotinoids reduce natural-enemy abundance, but not as strongly as alternative insecticide options such as soil- and foliar-applied pyrethroids. Furthermore we hypothesized that seed-applied neonicotinoids affect natural enemies through a combination of toxin exposure and prey scarcity.MethodsTo test our hypotheses, we compiled datasets comprising observations from randomized field studies in North America and Europe that compared natural-enemy abundance in plots that were planted with seed-applied neonicotinoids to control plots that were either (1) managed without insecticides (20 studies, 56 site-years, 607 observations) or (2) managed with pyrethroid insecticides (eight studies, 15 site-years, 384 observations). Using the effect size Hedge’s d as the response variable, we used meta-regression to estimate the overall effect of seed-applied neonicotinoids on natural-enemy abundance and to test the influence of potential moderating factors.ResultsSeed-applied neonicotinoids reduced the abundance of arthropod natural enemies compared to untreated controls (d = −0.30 ± 0.10 [95% confidence interval]), and as predicted under toxin exposure this effect was stronger for insect than for non-insect taxa (QM = 8.70, df = 1, P = 0.003). Moreover, seed-applied neonicotinoids affected the abundance of arthropod natural enemies similarly to soil- or foliar-applied pyrethroids (d = 0.16 ± 0.42 or −0.02 ± 0.12; with or without one outlying study). Effect sizes were surprisingly consistent across both datasets (I2 = 2.7% for no-insecticide controls; I2 = 0% for pyrethroid controls), suggesting little moderating influence of crop species, neonicotinoid active ingredients, or methodological choices.DiscussionOur meta-analysis of nearly 1,000 observations from North American and European field studies revealed that seed-applied neonicotinoids reduced the abundance of arthropod natural enemies similarly to broadcast applications of pyrethroid insecticides. These findings suggest that substituting pyrethroids for seed-applied neonicotinoids, or vice versa, will have little net affect on natural enemy abundance. Consistent with previous lab work, our results also suggest that seed-applied neonicotinoids are less toxic to spiders and mites, which can contribute substantially to biological control in many agricultural systems. Finally, our ability to interpret the negative effect of neonicotinoids on natural enemies is constrained by difficulty relating natural-enemy abundance to biological control function; this is an important area for future study.

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Section: Introductionmentioning

confidence: 99%

Meta-analysis reveals that seed-applied neonicotinoids and pyrethroids have similar negative effects on abundance of arthropod natural enemies

Douglas

Tooker

2016

PeerJ

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“…Regardless, our results indicate that A. certus is more susceptible to imidacloprid and thiamethoxam than is the soybean aphid. Thus, it is important to weigh the need for seed treatments for early season soybean aphid control against the risk they pose to important natural enemies, especially in regions, such as Ontario, where A. certus is the dominant soybean aphid parasitoid and vegetative stage infestations of soybean aphid are rare (Hallett et al 2013). Furthermore, the utility of seed treatments for soybean aphid management are questionable given that aphid infestations typically occur after the insecticidal activity of these chemicals has diminished ).…”

Section: Discussionmentioning

confidence: 96%

“…Natural enemies provide important biological control services and can limit soybean aphid population growth (Hallett et al 2013). Imidacloprid and thiamethoxam seed treatments reduced biological control services provided by A. certus for at least 10 wk after planting under greenhouse conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Native to Asia, the soybean aphid parasitoid Aphelinus certus Yasnosh, has become naturalized in Ontario (Frewin et al 2010) and in the eastern United States (Heimpel et al 2010). This parasitoid is relatively common in Ontario, and is believed to contribute to soybean aphid suppression and control (Frewin et al 2010, Hallett et al 2013.…”

mentioning

confidence: 99%

“…Soybean aphid feeding can reduce soybean yields (Beckendorf et al 2008, Catangui et al 2009), and therefore foliar-and seed-applied insecticides are often used for soybean aphid management (Ontario Ministry of Agriculture Food and Rural Affairs [OMAFRA] 2009). However, natural enemies play an important role in regulating soybean aphid populations , Rutledge et al 2004, Costamagna and Landis 2006, Costamagna et al 2007, Costamagna et al 2008, Noma and Brewer 2008, Hallett et al 2013. The susceptibility of soybean aphid natural enemies to insecticides used in soybean production should be assessed so that insecticides with minimal nontarget effects can be preferentially used to both preserve natural enemies and prevent soybean aphid resurgence.…”

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confidence: 99%

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Susceptibility of <I>Aphelinus certus</I> (Hymenoptera: Aphelinidae) to Neonicotinoid Seed Treatments Used for Soybean Pest Management

Frewin¹,

Schaafsma²,

Hallett³

2014

j econ entomol

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Soybean aphid is an economic pest of soybean in North America. Currently, management of soybean aphid is achieved through the use of foliar- and seed-applied insecticides. However, natural enemies play an important role in regulating soybean aphid populations, and may be adversely affected by insecticides. The effects of imidacloprid and thiamethoxam seed treatments on the soybean aphid parasitoid, Aphelinus certus Yasnosh, were examined using a tritrophic bioassay. A. certus was able to parasitize soybean aphids feeding on imidacloprid- and thiamethoxam-treated plants 5 and 6 wk after planting, respectively. However, up to 10 wk after planting, overall parasitism rates were reduced by 69-88% compared with the control. Therefore, neonicotinoid seed treatments may reduce the effectiveness of A. certus as a natural enemy of soybean aphid in seed-treated crops.

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Parasitoid‐mediated indirect interactions between unsuitable and suitable hosts generate apparent predation in microcosm and modeling studies

Monticelli

Desneux

Heimpel

2021

Ecology and Evolution

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Incorporating natural enemy units into a dynamic action threshold for the soybean aphid,Aphis glycines(Homoptera: Aphididae)

Abstract: The DAT approach has the potential to reduce pesticide use, will help preserve natural enemy populations and can be applied to other pest systems with diverse natural enemy guilds.

Cited by 43 publications

References 56 publications

Meta-analysis reveals that seed-applied neonicotinoids and pyrethroids have similar negative effects on abundance of arthropod natural enemies

Meta-analysis reveals that seed-applied neonicotinoids and pyrethroids have similar negative effects on abundance of arthropod natural enemies

Susceptibility of <I>Aphelinus certus</I> (Hymenoptera: Aphelinidae) to Neonicotinoid Seed Treatments Used for Soybean Pest Management

Parasitoid‐mediated indirect interactions between unsuitable and suitable hosts generate apparent predation in microcosm and modeling studies

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