Weed Control J 2022; 21: e202200769
Herbicide efficacy on Spermacoce verticillata control and selectivity for maize plants
DOI: 10.7824/wcj.2022;21:00769
Abstract
Background
The weed Spermacoce verticillata can be problematic for maize, especially when it is cultivated in the first crop. In this context, it is important to investigate the selectivity of herbicides, as well as their effectiveness.
Objective
Evaluate the efficacy of atrazine, saflufenacil, flumioxazin, carfentrazone and bentazon in the control of S. verticillata and the potential for damage to maize.
Methods
The experiment was carried out in a greenhouse, using a completely randomized design, with four replications. Were applied, in two rates, atrazine, saflufenacil, flumioxazin, carfentrazone and bentazon, in addition to the control without application. The S. verticillata control and injury in maize plants were evaluated. Maize plants were at the V2 stage, and the weed had 1-2 pairs of leaves.
Results
Greater injury was observed for the application of the flumioxazin and saflufenacil on maize. With greater symptoms for higher rates. Saflufenacil and flumioxazin were among the most effective. Atrazine also provided final control at the same level as the most effective ones. The bentazon was selective for maize, it was not effective in controlling S. verticillata .
Conclusions
Atrazine and carfentrazone were effective in controlling S. verticillata with 1-2 pairs of leaves and selective for corn plants in V2, with emphasis on atrazine, with control of 88-97% and without injury at 28 DAA. Saflufenacil and flumioxazin were effective in controlling S. verticillata , with 1-2 pairs of leaves, with approximately 98% control at 28 DAA. However, injuries were observed in maize.
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