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Comparison of the Sensitivity of Freshwater Algae to 6 Pesticides for Paddy Rice  

Bae, Chul-Han (Agricultural Research Center, Hankooksamgong Co. Ltd.)
Park, Yeon-Ki (Pesticide Safety Division, National Institute of Agricultural Science and Technology)
Kim, Yeon-Sik (Agricultural Research Center, Hankooksamgong Co. Ltd.)
Cho, Kyung-Won (Agricultural Research Center, Hankooksamgong Co. Ltd.)
Lee, Suk-Hee (Agricultural Research Center, Hankooksamgong Co. Ltd.)
Jung, Chang-Kook (Agricultural Research Center, Hankooksamgong Co. Ltd.)
Publication Information
The Korean Journal of Pesticide Science / v.12, no.3, 2008 , pp. 222-228 More about this Journal
Abstract
Algal Growth-inhibition tests were conducted with 6 pesticides butachlor GR (5%), butachlor EW (33%), isoprothiolane GR (12%), isoprothiolane EC (40%), diazinon GR (3%) and diazinon EC (34%) to determine their comparative toxicity to three species of freshwater green algae Selenastrum capricornutum, Scenedesmus subspicatus, Chlorella vulgris and one species diatom Nitzschia palea. The test species were exposed to the test pesticide for 72 hours and the toxicity represented $EC_{50}$ value calculated by the reduction in growth rate at 72 hours. The toxicity of EC or EW formulation to green algae and diatom was higher than the toxicity of GR formulation at all test in this study. Also, the toxicity of EC formulation was higher than the toxicity technical pesticide. These results indicate that the types of pesticide formulation may affect on their toxicity on algae and the green alga, S. capricornutum and S. subspicatus were more sensitive than C. vulgris. Also, the sensitivity of the diatom, N. palea showed equal or lower than S. capricornutum, S. subspicatus but more sensitive than C. vulgris.
Keywords
algae; diatom; pesticide; sensitivity; growth inhibition test;
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