Toxicity of Cypermethrin-chlorpyrifos and Butachlor to Tadpole of Quasipaa boulengeri Zhang Xiaoqin, Zhao Changju and Wu Haoyang E3S Web Conf., 293 (2021) 01012 Published online: 23 July 2021 DOI: 10.1051/e3sconf/202129301012