Effects of imidacloprid and clothianidin seed treatments on wheat aphids and their natural enemies on winter wheat

Zhang, Peng; Zhang, Xuefeng; Zhao, Yunhe; Yan, Wei; Mu, Wei; Liu, Feng

doi:10.1002/ps.4090

Cited by 56 publications

(48 citation statements)

References 35 publications

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“…In foliar sweep net and visual samples from soybeans, we also observed reduced abundance or activity density of lady beetles (Coccinellidae), which are known to be impacted by neonicotinoids (Amjad, Azam, Sarwar, Malik, & Sattar, 2018;Disque et al, 2018;Zhang et al, 2016), as well as predatory thrips; some of these impacts occurred across all three pesticide treatments and thus may have been driven by the fungicide treatments. In contrast, spider abundance was higher in the maize visual samples from the insecticide-treated plots, and to a lesser extent the fungicide-treated plots.…”

Section: Non-target Impacts Of Pesticide Seed Treatments On Arthropodsmentioning

confidence: 70%

Ecological impacts of pesticide seed treatments on arthropod communities in a grain crop rotation

Dubey

Lewis

Dively

et al. 2020

Journal of Applied Ecology

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1. While many studies have investigated non-target impacts of neonicotinoid seed treatments (NSTs), they usually take place within a single crop and focus on specific pest or beneficial arthropod taxa.2. We compared the impacts of three seed treatments to an untreated control: imidacloprid + fungicide products, thiamethoxam + fungicide products and fungicide products alone in a 3-year crop rotation of full-season soybean, winter wheat, doublecropped soybean and maize. Specifically, we quantified neonicotinoid residues in the soil and in weedy winter annual flower buds and examined treatment impacts on soil and foliar arthropod communities as well as on plant growth and yield.3. Unquantifiably low amounts of insecticide were found in winter annual flowers of one species in one site year, which did not correspond with our treatments.Although low levels of insecticide residues were present in the soil, residues were not persistent. Residues were highest in the final year of the study, suggesting some accumulation.4. We observed variable impacts of NSTs on the arthropod community; principle response curve and redundancy analyses exhibited occasional treatment effects, with treatments impacting the abundance of various taxa, including predators and parasitoids. Overall, foliar taxa were more impacted than soil taxa, and the fungicides occasionally affected communities and individual taxa. 5. Pest pressure was low throughout the study, and although pest numbers were reduced by the insecticides, corresponding increases in yield were not observed.6. Synthesis and applications. Pesticide seed treatments can impact arthropod taxa, including important natural enemies even when environmental persistence and active ingredient concentrations are low. The foliar community in winter wheat showed that in some cases, these impacts can last for several months after planting. Given the low pest pressure and lack of yield improvement in full-season soybean, double-cropped soybean, winter wheat and maize, we did not observe benefits that could justify the risks associated with neonicotinoid seed treatment (NST) use. Our results suggest that NSTs are not warranted in Maryland grain production, outside of specific instances of high pest pressure. | 937Journal of Applied Ecology DUBEY Et al.

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Section: Non-target Impacts Of Pesticide Seed Treatments On Arthropodsmentioning

confidence: 70%

Ecological impacts of pesticide seed treatments on arthropod communities in a grain crop rotation

Dubey

Lewis

Dively

et al. 2020

Journal of Applied Ecology

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“…However, residues in soil of all seven neonicotinoids reduced the soil fauna significantly (p < 0.05), in particular the larvae of hoverflies (Diptera: Syrphidae). Foliar sprays of all compounds produced similar effects to their seed treatments but the impacts on soil larvae were not significant (Zhang et al 2016b). The authors acknowledge the efficient aphid control by the three neonicotinoids above while warning of the long-term negative effects derived of suppressing beneficial insect's larvae and also species that feed on extra floral nectar, such as some ladybugs and polyphagous parasitoids.…”

Section: Predatorsmentioning

confidence: 85%

“…Both effects depend on the toxicity to pest and to their predators and on the residue level of exposure in plants (which have been treated or not). It has been shown that uptake of several neonicotinoids after seed treatment in cotton crops differed according to their water solubility, with nitenpyram, dinotefuran, and thiamethoxam showing the highest residues in plant tissues and lowest in the soil (Zhang et al 2016b). Consequently, these three compounds were more effective against the cotton aphid Aphis gossypii than the other four neonicotinoids.…”

Section: Predatorsmentioning

confidence: 99%

An update of the Worldwide Integrated Assessment (WIA) on systemic insecticides. Part 2: impacts on organisms and ecosystems

Pisa

Goulson

Yang

et al. 2017

Environ Sci Pollut Res

202

144

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New information on the lethal and sublethal effects of neonicotinoids and fipronil on organisms is presented in this review, complementing the previous Worldwide Integrated Assessment (WIA) in 2015. The high toxicity of these systemic insecticides to invertebrates has been confirmed and expanded to include more species and compounds. Most of the recent research has focused on bees and the sublethal and ecological impacts these insecticides have on pollinators. Toxic effects on other invertebrate taxa also covered predatory and parasitoid natural enemies and aquatic arthropods. Little new information has been gathered on soil organisms. The impact on marine and coastal ecosystems is still largely uncharted. The chronic lethality of neonicotinoids to insects and crustaceans, and the strengthened evidence that these chemicals also impair the immune system and reproduction, highlights the dangers of this particular insecticidal class (neonicotinoids and fipronil), with the potential to greatly decrease populations of arthropods in both terrestrial and aquatic environments. Sublethal effects on fish, reptiles, frogs, birds, and mammals are also reported, showing a better understanding of the mechanisms of toxicity of these insecticides in vertebrates and their deleterious impacts on growth, reproduction, and neurobehaviour of most of the species tested. This review concludes with a summary of impacts on the ecosystem services and functioning, particularly on pollination, soil biota, and aquatic invertebrate communities, thus reinforcing the previous WIA conclusions .

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“…These contradictory results could be due to variation in behavioral responses to the active ingredients; Easton and Goulson (2013) found that spiders were attracted to low doses of imidacloprid, but were repelled by a high dose. In sweep net and visual samples, we observed reduced abundance or activity density of various predators that have previously been shown to be impacted by NSTs, such as minute pirate bugs (Anthocoridae), lady beetles (Coccinellidae), and predatory thrips (Phlaeothripidae) (Albajes, López, & Pons, 2003; Amjad, Azam, Sarwar, Malik, & Sattar, 2018; Disque et al, 2018; Gontijo et al, 2015; Seagraves & Lundgren, 2012; Zhang et al, 2016). The imidacloprid treatment also suppressed aphelinid and braconid wasps captured on sticky cards in winter wheat, and braconid wasps in double cropped soybean sweep net samples.…”

Section: Discussionmentioning

confidence: 79%

“…In maize and soybean, neonicotinoid seed treatment active ingredients only remain active in plant tissue for three to four weeks post planting (Alford & Krupke, 2017; Myers & Hill, 2014). In fall planted winter wheat, the exact activity period is unknown; Zhang et al (2016) found trace amounts of imidacloprid and clothianidin in seed treated winter wheat up to 200 days after planting and observed successful control of cereal aphids throughout the growing period. The presence of insecticide in plant tissue over a longer period could be a source of exposure for non-target beneficials arthropods such as lady beetles and minute pirate bugs that supplement their diet with plant material, or parasitoids that rely on nectar as a food source (Gontijo et al, 2015; Moscardini et al, 2014; Moser & Obrycki, 2009).…”

Section: Discussionmentioning

confidence: 99%

Evaluating the ecological impacts of pesticide seed treatments on arthropod communities in a grain crop rotation

Dubey

Lewis

Dively

et al. 2019

Preprint

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311. While many studies have investigated non-target impacts of neonicotinoid seed treatments 32 (NSTs), they usually take place within a single crop and focus on specific pest or beneficial 33 arthropod taxa. 34 2. We compared the impacts of three seed treatments to an untreated control: imidacloprid + 35 fungicide products, thiamethoxam + fungicide products, and fungicide products alone in a three- 36 year crop rotation of full-season soybean, winter wheat, double-cropped soybean and maize. 37Specifically, we quantified neonicotinoid residues in the soil and in weedy winter annual flower 38 buds and examined treatment impacts on soil and foliar arthropod communities, and on plant 39 growth and yield. 40 3. Trace amounts of insecticide were found in winter annual flowers of one species in one site 41year, which did not correspond with our treatments. Although low levels of insecticide residues 42 were present in the soil, residues were not persistent. Residues were highest in the final year of 43 the study, suggesting some accumulation. 44 4. We observed variable impacts of NSTs on the arthropod community; principle response curve 45 analysis, diversity and evenness values exhibited occasional community disturbances, and 46 treatments impacted the abundance of various taxa. Overall, imidacloprid had a greater effect 47 than thiamethoxam, with the fungicide only treatment also occasionally impacting communities 48 and individual taxa.49 5. Pest pressure was low throughout the study, and although pest numbers were reduced by the 50 insecticides no corresponding increases in yield were observed. However, the fungicide products 51 contributed to higher yields in wheat.52 6. Synthesis and applications. Pesticide seed treatments can disturb arthropod communities, even 53 when environmental persistence and active ingredient concentrations are low. The foliar 54 3community in wheat and maize exhibited a trend of increasing disturbance throughout the 55 sampling period, suggesting that recovery from the impacts of NSTs is not always rapid. Our 56 study is among the first to demonstrate that seed applied fungicides alone can disrupt arthropod 57 communities in agroecosystems and highlights the need for further investigation into the impacts 58 of seed applied fungicides. 59 Key words 60 Fungicides; Imidacloprid; Glycine max L. Merr.; Neonicotinoid residues; Thiamethoxam; 61 Triticum spp.; Zea mays L.;62

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Effects of imidacloprid and clothianidin seed treatments on wheat aphids and their natural enemies on winter wheat

Cited by 56 publications

References 35 publications

Ecological impacts of pesticide seed treatments on arthropod communities in a grain crop rotation

Ecological impacts of pesticide seed treatments on arthropod communities in a grain crop rotation

An update of the Worldwide Integrated Assessment (WIA) on systemic insecticides. Part 2: impacts on organisms and ecosystems

Evaluating the ecological impacts of pesticide seed treatments on arthropod communities in a grain crop rotation

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