Evaluation of the efficiency of 2.4-D, clopyralid and glyphosate in relation to Ambrosia artemisiifolia L. growing in Belarus

The biological effectiveness of the active substances 2.4-D, clopyralide and glyphosate (Sigma, USA) in relation to ragweed under the controlled laboratory conditions was studied. The number of physiological parameters (plant height, leaf formation, stem diameter, chlorophyll content, dry weight accumulation) of the studied plants were also evaluated. It was found that treating ragweed plants having 3 pairs of leaves by herbicides 2.4-D, clopyralid and glyphosate showed maximum biological effectiveness and the level of inhibition of physiological processes at doses of 530, 461, and 406 g/ha respectively. The biological effectiveness of herbicides was 86 % for 2.4-D, clopyralid - 83, glyphosate - 80 %. It was revealed that in order to speed up and optimize the process of testing the effectiveness of herbicides against ragweed in the field, the express method for determining the chlorophyll content with the DUALEX portable flavonol-chlorophyllometer can be used. This indicator will determine the effectiveness of herbicides already on the 7th day after treatment, which will significantly accelerate the selection of substances and herbicide consumption rates.

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