Tolerance of Cabbage Crop to Auxin Herbicides

Abstract

The presence of weeds in cabbage cultivation areas causes a reduction in the productivity and quality of the commercial product. Given the difficulties in management and the scarcity of registered products for weed control in cabbage cultivation, this study aimed to evaluate the tolerance of the cabbage cultivars Astrus Plus to the herbicides 2,4-D and dicamba. Two experiments were performed; one under controlled conditions and another conducted in the field. The efficacy of the herbicides on the initial growth of the crop was evaluated in the first experiment, measuring the dry matter of the aerial part, the root of the plant, and evaluating the intoxication of the plants. Plant poisoning was also evaluated in the second experiment, along with crop production. No changes in the dry matter and plant poisoning were observed after the analyses performed in the controlled environment, showing that the cabbage presented tolerance to the applied herbicides. On the other hand, results from the experiments performed in the field showed that herbicide 2,4-D poisoned the cabbage causing reductions in production. Dicamba did not cause any damage in the initial phase of cultivation to this crop, with no reductions in its production. These results indicated the potential use of this herbicide in cabbage cultivation. It can be concluded from this study that the cultivar Astrus Plus is tolerant to dicamba. Under controlled conditions, 2,4-D does not cause toxicity to this cultivar, different from its effect when used in the field, where this herbicide can kill the cabbage plants.

Sensitivity to sublethal rates of dicamba for selected mid-Atlantic vegetable crops

“…Consistent with results of this study observed on kale, Nascimento et al (2020) did not report any injury on greenhouse-grown cabbage 'Astrus Plus' (Brassica oleracea var. capitata L.) sprayed with dicamba at 2.4 to 96 g ae ha −1 when plants had two pairs of true leaves.…”

Initial development of peanut seedlings grown in soil with herbicide residue

“…But there was a stimulation of the synthetic auxin in the aerial part, because when it was applied to the soil, there may have been a dilution of its concentration in the liquid part, therefore, doses above four liters of the product started to reduce the height of the plant (Gazola et al, 2019;, However, some plant species can metabolize the 2,4D molecule more efficiently, and thus this molecule is transformed into an original plant molecule. Children produced during auxin synthesis in sensitive eudicots and tolerant monocots showed close responses, but the amount of metabolites produced may vary, and thus results in a lower concentration of tolerant monocots compared to eudicots (Nascimento et al, 2020), where this difference in plant height can be demonstrated in Figure 2. No statistical difference was observed for the leaf area (LA) of peanuts after cultivation in soil with herbicide residue, where the overall average was 8.85.…”