Acute toxicity of herbicide formulations and chronic toxicity of technical-grade trifluralin to larval green frogs (Lithobates clamitans).
Fewer toxicity studies have been performed on herbicides than on insecticides despite heavier use of herbicides and evidence of herbicide formulation toxicity to amphibians. We conducted acute and chronic toxicity tests with the herbicide trifluralin (2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)aniline) on tadpoles. Herbicide formulations had lower median lethal concentrations than an insecticide formulation and technical-grade trifluralin. Chronic trifluralin exposure resulted in significantly smaller tadpoles at low concentrations (20 µg/L) compared with controls and 200-µg/L treatments.
The Institute of Environmental and Human Health, Department of Environmental Toxicology, Texas Tech University, Lubbock, Texas, USA. scott.weir@tiehh.ttu.edu
Scott M
SM
Weir
Shuangying
S
Yu
Christopher J
CJ
Salice
D000814:Aniline Compounds / Q000633:toxicity; D000818:Animals; D006540:Herbicides / Q000633:toxicity*; D006801:Humans; D007306:Insecticides / Q000633:toxicity; D007814:Larva; D008294:Malathion / Q000633:toxicity; D063188:Rana clamitans; D023382:Toxicity Tests, Acute; D036401:Toxicity Tests, Chronic; D014274:Trifluralin / Q000633:toxicity*
D000814:Aniline Compounds; D006540:Herbicides; D007306:Insecticides; D014274:Trifluralin; D008294:Malathion; C030856:pendimethalin