Abstract
Some mosquito species utilize the small niches of water that are abundant in farmland habitats. These niches are susceptible to effects from agricultural pesticides, many of which are applied aerially over large tracts of land. One principal form of weed control in agricultural systems involves the development of herbicide-tolerant crops. The impact of sub-agricultural levels of these herbicides on mosquito survival and life-history traits of resulting adults have not been determined. The aim of this study was to test the effect of two commercial herbicides (Beyond and Roundup) on the survivorship, eclosion time, and body mass of Aedes aegypti. First instar A. aegypti larvae were exposed to varying concentrations (270, 550 and 820 μg/m2 of glyphosate and 0.74, 1.49, 2.24 μL imazamox/m2), all treatments being below recommended application rates, of commercial herbicides in a controlled environment and resulting adult mosquitoes were collected and weighed. Exposure to Roundup had a significant negative effect on A. aegypti survivorship at medium and high sub-agricultural application concentrations, and negatively affected adult eclosion time at the highest concentration. However, exposure to low concentrations of Beyond significantly increased A. aegypti survivorship, although adult female mass was decreased at medium sub-agricultural concentrations. These results demonstrate that low concentrations of two different herbicides, which can occur in rural larval habitats as a result of spray drift, can affect the same species of mosquito in both positive and negative ways depending on the herbicide applied. The effects of commercial herbicides on mosquito populations could have an important effect on disease transmission within agricultural settings, where these and other herbicides are extensively applied to reduce weed growth.
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Acknowledgments
The authors would like to thank Faithful Williams for assistance in weighing the mosquitoes. This project was funded by the Oklahoma Agricultural Research Station (OKL-02909).
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The authors declare that they have no conflict of interest.
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Morris, A., Murrell, E.G., Klein, T. et al. Effect of two commercial herbicides on life history traits of a human disease vector, Aedes aegypti, in the laboratory setting. Ecotoxicology 25, 863–870 (2016). https://doi.org/10.1007/s10646-016-1643-9
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DOI: https://doi.org/10.1007/s10646-016-1643-9