Toxicity and risk of permethrin and naled to non-target insects after adult mosquito management
We derived laboratory LC50 values, assessed non-target insect risks, and conducted a field bioassay for ultra-low-volume (ULV) aerosol applications of insecticides used to manage adult mosquitoes. The house cricket, Acheta domesticus (L.), was used as an indicator species for medium- to large-bodied...
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Published in | Ecotoxicology (London) Vol. 19; no. 6; pp. 1140 - 1146 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Boston
Boston : Springer US
01.08.2010
Springer US Springer Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | We derived laboratory LC50 values, assessed non-target insect risks, and conducted a field bioassay for ultra-low-volume (ULV) aerosol applications of insecticides used to manage adult mosquitoes. The house cricket, Acheta domesticus (L.), was used as an indicator species for medium- to large-bodied ground dwelling insects. The 24-h LC₅₀ values for Permanone® (formulated product of permethrin), Permanone + piperonyl butoxide (PBO), technical grade permethrin, and technical grade permethrin + PBO ranged from 0.052 to 0.9 μg/cm². The 24 h LC₅₀ for technical grade naled and Trumpet® (formulated product of naled) were 0.038 and 0.44 μg/cm², respectively. The synergist ratio was 2.65 for Permanone + PBO and 1.57 for technical grade permethrin + PBO. The toxicity of technical grade permethrin was about 10-fold greater than Permanone. A risk assessment using modeled estimated environmental concentrations resulted in risk quotients (RQ) that exceeded regulatory levels of concern, but when compared to field-derived actual environmental concentrations RQs did not exceed a regulatory level of concern, except in the case of technical grade naled. These results were expected because higher tiered risk assessments using field-verified data generally lead to lower risk estimates. Field bioassays using caged crickets showed no significant mortality for permethrin or naled after a single truck-mounted ULV application. The results of the risk assessment using actual environmental concentrations are supported by the field bioassays and suggest that a single ULV application of synergized or unsynergized permethrin and naled most likely will not result in population impacts on medium- to large-bodied insects. |
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Bibliography: | http://dx.doi.org/10.1007/s10646-010-0497-9 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0963-9292 1573-3017 |
DOI: | 10.1007/s10646-010-0497-9 |