Exposure assessment for terrestrial non-target arthropods

Gonzalez-Valero, Juan; Campbell, Peter J.; Fritsch, H. J.; Grau, R.; Romijn, Kees

doi:10.1007/bf02956453

Cited by 12 publications

(2 citation statements)

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“…In the case of a lack of relevant parameters after multiple applications of a specific pesticide, the MAF value is defaulted to 3. [52][53] The predatory mite T. pyri was used as the indicator species of predatory arthropods in the European Union (EU). 32,33 However, due to the lack of sufficient species sensitivity test data and species distribution surveys in China, specific indicator species have not been defined in the Risk Assessment Guidance Document for NTAs.…”

Section: Discussionmentioning

confidence: 99%

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Toxicity and risk assessment of nine pesticides on nontarget natural predator Harmonia axyridis (Coleoptera: Coccinellidae)

Cheng

Xue³

et al. 2022

Pest Management Science

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BACKGROUND: Harmonia axyridis (Coleoptera: Coccinellidae) is a beneficial predatory arthropod in the agricultural ecosystem. For the success and development of integrated pest management strategies, it is essential to assess the toxicity risks of commonly used pesticides to nontarget arthropods. RESULTS:The glass tube residue method was used to determine the risk of nine pesticides to H. axyridis after second-instar exposure. To assess the potential risk of the selected pesticides, the pre-adult LR 50 values were calculated by the hazard quotient (HQ) method. The LR 50 (application rate causing 50% mortality) values of imidacloprid, dinotefuran, thiamethoxam, acetamiprid, bifenthrin, and dimethoate were 0.44, 0.82, 0.10, 0.05, 0.04, and 0.21 g a.i. ha −1 , respectively, showing unacceptable risk to H. axyridis after exposure to in and off field. However, emamectin benzoate and two fungicides, tebuconazole and myclobutanil, posed a low risk to H. axyridis and their HQ values were less than the trigger value of 5. CONCLUSIONS:The four neonicotinoid insecticides (imidacloprid, dinotefuran, thiamethoxam, and acetamiprid), pyrethroid bifenthrin, and organophosphorus dimethoate showed a high risk to H. axyridis. Emamectin benzoate, tebuconazole, and myclobutanil showed a low risk to H. axyridis under both exposure scenarios. The results provide critical scientific evidence to guide future regulation of pesticide management practices and protection of nontarget arthropods like H. axyridis.

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Section: Discussionmentioning

confidence: 99%

“…The MAF is used to predict the exposure rates in off‐field scenarios and reduce uncertainty to enhance the protection of NTA populations and communities. In the case of a lack of relevant parameters after multiple applications of a specific pesticide, the MAF value is defaulted to 3 52–53 …”

Section: Discussionmentioning

confidence: 99%

Toxicity and risk assessment of nine pesticides on nontarget natural predator Harmonia axyridis (Coleoptera: Coccinellidae)

Cheng

Xue³

et al. 2022

Pest Management Science

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What can laboratory studies tell us about potential effects of pesticides on nontarget arthropods populations and communities in the field?

Thompson,

Elston

2024

Integr Envir Assess & Manag

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Over the past decades, concern has been increasing over reported declines in aboveground biodiversity on farmland. In many regions, data on the toxicity of pesticides to honeybees (Apis mellifera), but not wider nontarget arthropod (NTA) data, are required for pesticide registration. In Europe, the effects of pesticides on NTAs and honeybees have been the subject of regulatory risk assessment for more than 30 years, resulting in a large database. Although insecticides may be expected to affect NTA populations, solely identifying insecticidal modes of action for further NTA testing would result in redundancy among low‐risk testing products and may also exclude other modes of action with potential effects in the field. This study assessed whether the honeybee acute risk assessment could provide any indication of the potential impact and recovery time of NTAs in cropped areas at the field scale and, if so, how it might be used in a tiered testing approach. The hazard quotients (HQs; foliar application rate/LR50) were derived for 151 active substances (32% insecticides, 28% fungicides, 38% herbicides, 2% plant growth regulators) for which toxicity data for established EU Tier 1 NTA indicator species (Typhlodromus pyri, Aphidius rhopalosiphi) and application rate data were available. These HQs were compared with published NTA HQ thresholds indicating the time to recovery of NTA populations and communities in field studies (>1 to >12 months). Using the same application rate data, honeybee acute risk quotient (RQ) and HQ were also determined and compared with NTA HQs and honeybee regulatory thresholds. These comparisons demonstrated that, where required, the current regulatory honeybee acute RQ of 0.4 or honeybee HQ of 50 can provide an efficient screening tier to target NTA testing at those products and uses with potential effects in the field where recovery may exceed 12 months. Integr Environ Assess Manag 2024;00:1–8. © 2024 SETAC

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