Acute toxicity and risk assessment of permethrin, naled, and dichlorvos to larval butterflies via ingestion of contaminated foliage

Hoang, Tham C.; Rand, Gary M.

doi:10.1016/j.chemosphere.2014.10.040

Cited by 13 publications

(30 citation statements)

References 18 publications

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“…A robust lepidopteran species sensitivity distribution could be used to estimate toxicity for insects of conservation concern and minimize, if not avoid, the time, costs, and challenges of rearing insects and host plants. Hoang and Rand (2015) carried out a probabilistic risk assessment for 3 insecticides encompassing 2 modes of action using toxicity data generated for 5 adult butterfly species. Developing an expanded lepidopteran sensitivity distribution with more insecticide modes of action requires clear description of dosimetry information to support a robust compilation of toxicity data.…”

Section: Discussionmentioning

confidence: 99%

Assessing Field‐Scale Risks of Foliar Insecticide Applications to Monarch Butterfly (Danaus plexippus) Larvae

Krishnan

Zhang

Bidne³

et al. 2020

Enviro Toxic and Chemistry

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Establishment and maintenance of milkweed plants (Asclepias spp.) in agricultural landscapes of the north central United States are needed to reverse the decline of North America's eastern monarch butterfly (Danaus plexippus) population. Because of a lack of toxicity data, it is unclear how insecticide use may reduce monarch productivity when milkweed habitat is placed near maize and soybean fields. To assess the potential effects of foliar insecticides, acute cuticular and dietary toxicity of 5 representative active ingredients were determined: beta‐cyfluthrin (pyrethroid), chlorantraniliprole (anthranilic diamide), chlorpyrifos (organophosphate), and imidacloprid and thiamethoxam (neonicotinoids). Cuticular median lethal dose values for first instars ranged from 9.2 × 10–3 to 79 μg/g larvae for beta‐cyfluthrin and chlorpyrifos, respectively. Dietary median lethal concentration values for second instars ranged from 8.3 × 10–3 to 8.4 μg/g milkweed leaf for chlorantraniliprole and chlorpyrifos, respectively. To estimate larval mortality rates downwind from treated fields, modeled insecticide exposures to larvae and milkweed leaves were compared to dose–response curves obtained from bioassays with first‐, second‐, third‐, and fifth‐instar larvae. For aerial applications to manage soybean aphids, mortality rates at 60 m downwind were highest for beta‐cyfluthrin and chlorantraniliprole following cuticular and dietary exposure, respectively, and lowest for thiamethoxam. To estimate landscape‐scale risks, field‐scale mortality rates must be considered in the context of spatial and temporal patterns of insecticide use. Environ Toxicol Chem 2020;39:923–941. © 2020 SETAC

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Section: Discussionmentioning

confidence: 99%

Assessing Field‐Scale Risks of Foliar Insecticide Applications to Monarch Butterfly (Danaus plexippus) Larvae

Krishnan

Zhang

Bidne³

et al. 2020

Enviro Toxic and Chemistry

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“…Our data suggest that the dietary bioassays also resulted in topical uptake of insecticide; Olaya‐Arenas et al (2020) also noted the possibility of combined exposures in their dietary studies. In 2 butterfly species, Hoang et al (2011; Hoang and Rand 2015) observed differential toxicity with the 2 exposure routes. For example, in Atala hairstreak larvae, permethrin was 9 times more toxic via the topical route, whereas in common buckeye larvae, naled and dichlorvos were 17 to 23 times more toxic via the dietary route.…”

Section: Discussionmentioning

confidence: 99%

Monarch Butterfly (Danaus plexippus) Life‐Stage Risks from Foliar and Seed‐Treatment Insecticides

Krishnan

Yang

Aust

et al. 2021

Enviro Toxic and Chemistry

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Conservation of North America's eastern monarch butterfly (Danaus plexippus) population would require establishment of milkweed (Asclepias spp.) and nectar plants in the agricultural landscapes of the north central United States. A variety of seed-treatment and foliar insecticides are used to manage early-and late-season pests in these landscapes. Thus, there is a need to assess risks of these insecticides to monarch butterfly life stages to inform habitat conservation practices. Chronic and acute dietary toxicity studies were undertaken with larvae and adults, and acute topical bioassays were conducted with eggs, pupae, and adults using 6 representative insecticides: beta-cyfluthrin (pyrethroid), chlorantraniliprole (anthranilic diamide), chlorpyrifos (organophosphate), imidacloprid, clothianidin, and thiamethoxam (neonicotinoids). Chronic dietary median lethal concentration values for monarch larvae ranged from 1.6 × 10 -3 (chlorantraniliprole) to 5.3 (chlorpyrifos) μg/g milkweed leaf, with the neonicotinoids producing high rates of arrested pupal ecdysis. Chlorantraniliprole and beta-cyfluthrin were generally the most toxic insecticides to all life stages, and thiamethoxam and chlorpyrifos were generally the least toxic. The toxicity results were compared to insecticide exposure estimates derived from a spray drift model and/or milkweed residue data reported in the literature. Aerial applications of foliar insecticides are expected to cause high downwind mortality in larvae and eggs, with lower mortality predicted for adults and pupae. Neonicotinoid seed treatments are expected to cause little to no downslope mortality and/or sublethal effects in larvae and adults. Given the vagile behavior of nonmigratory monarchs, considering these results within a landscape-scale context suggests that adult recruitment will not be negatively impacted if new habitat is established in close proximity of maize and soybean fields in the agricultural landscapes of the north central United States. Environ Toxicol Chem 2021;00:1-17.

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“…Some Miami-Dade residents protested the aerial spraying of naled. This opposition cited evidence of human health risks from naled at higher levels of exposure as well as toxicity to bees and other beneficial organisms (see generally, CDC, 2018 ; Hoang & Rand, 2015a ; Hoang & Rand, 2015b ; Silver et al, 2017 ; Virginia Department of Health, 2019 ) and the fact that the product was not approved for use in Europe. Opposition came to a head at an Emergency Workshop organized by the Miami Beach City Commission on September 7, where multiple members of the public expressed their fear that naled was toxic with effects “equal or worse than Zika” (Miami Beach City Commission Emergency Workshop, 2016 ).…”

Section: Background: the 2016 South Florida Zika Outbreakmentioning

confidence: 99%

Trade-offs versus reassurance: framing competing risks in the 2016 Zika outbreak

et al. 2021

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Environmental threats increasingly entail important risks from government responses. In considering the risks of a new vector-borne disease, for example, decision-makers must also grapple with potential risks from responses such as the aerial spraying of pesticides. In communicating about these complex risks, public officials often choose different “frames” that promote different conceptualizations of the issue. Yet prior research has paid limited attention to how public officials frame the related risks of the environmental threat and the public response. This paper starts to fill that gap by conducting a content analysis of statements by public officials regarding risks from the threat of a local outbreak of the Zika virus in South Florida in 2016, as well as risks from the response of aerial pesticide spraying. Based on limited prior research, we hypothesize that public officials are likely to have adopted a “risk maximization” frame that stressed the high risks from exposure to Zika, but a “risk trade-off” frame when discussing aerial spraying. In actuality, we find that officials strongly favored a “reassurance” frame that downplayed both types of risks. Based on this analysis, we suggest framing strategies for disease outbreaks and other threats with potentially risky government responses may vary significantly depending on local contexts and that the South Florida experience was a missed opportunity to test the strategy of trade-off framing.

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Acute toxicity and risk assessment of permethrin, naled, and dichlorvos to larval butterflies via ingestion of contaminated foliage

Cited by 13 publications

References 18 publications

Assessing Field‐Scale Risks of Foliar Insecticide Applications to Monarch Butterfly (Danaus plexippus) Larvae

Assessing Field‐Scale Risks of Foliar Insecticide Applications to Monarch Butterfly (Danaus plexippus) Larvae

Monarch Butterfly (Danaus plexippus) Life‐Stage Risks from Foliar and Seed‐Treatment Insecticides

Trade-offs versus reassurance: framing competing risks in the 2016 Zika outbreak

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