Joint Toxicity Determination of Clopyralid, Picloram and Benazolin Mixtures on Broad-leaved Weed Lapsana apogonoides Maxim, in Rape Fields.

[Objectives] This study was conducted to investigate the compounding of three herbicides: clopyralid, picloram and benazolin, so as to improve the effectiveness of herbicides. [Methods] With Lapsana apogonoides Maxim, as the target and clopyralid, picloram and benazolin as the test agents, seven gradient concentrations were set up to determine the joint toxicity of the three agents. [Results] When the compounding ratio of picloram, clopyralid and benazolin was 2-1:6, the maximum co-toxicity coefficient was 290.0. [Conclusions] The compounding of picloram, clopyralid and benazolin has a significant synergistic effect on L. apogonoides, which reduces production costs and environmental pressure, providing technical support for the effective control of broad-leaved weeds such as L. apogonoides. [ABSTRACT FROM AUTHOR]