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Soil residual herbicides in cotton should be included in multiple applications from preplant through layby. Residual herbicides gradually lose their effectiveness as they lay in the field waiting to be activated by rainfall or irrigation. Consecutive residual herbicides should be applied to overlap the effectiveness interval of the previous treatment to prevent weed escapes. Weeds that escape control by herbicides should be removed by hand to prevent crop competition and to prevent the addition of weed seeds to the seed bank in the soil.
Read more about residual herbicide applications in cotton at RoundupReadyPLUS.com.