Evaluation of Broadleaf Weeds Control with Selectivity of Post-Emergence Herbicides in Sugar Beet (Beta vulgaris L.)

  • Ali Asghar CHITBAND Department of Agronomy, Faculty of Agriculture, Ferdowsi University of Mashhad, Iran (IR)
  • Reza GHORBANI Department of Agronomy, Faculty of Agriculture, Ferdowsi University of Mashhad, Iran (IR)
  • Mohammad Hassan RASHED MOHASSEL Department of Agronomy, Faculty of Agriculture, Ferdowsi University of Mashhad, Iran (IR)
  • Majid ABBASPOOR Section of Plant Protection, Agricultural and Natural Resources Research Center of Mashhad, Iran (IR)
  • Rahmat ABBASI University of Agricultural Sciences and Natural Resources, Sari, Iran (IR)
Keywords: dose-response curve; effective dose; growth stage; reduced herbicide dose; weed control

Abstract

The reduction of herbicide applications is a main research priority in recent years. In order to study the effect of individual post-emergence application of sugar beet broad-leaf herbicides at four to six true-leaf stage of weeds, experiments were conducted during 2013. Treatments included untreated control and several rates of desmedipham + phenmedipham + ethofumesate, chloridazon and clopyralid on Portulaca oleracea, Solanum nigrum, Amaranthus retroflexus and Chenopodium album. A completely randomized layout with three replications was used for each herbicide. Three weeks after spraying (WAS), plants were harvested and measured their dry weight. These herbicides were more effective to control Portulaca oleracea than other weeds, thereupon minimum dose required for a satisfactory efficacy of 90% reduction of Portulaca oleracea aboveground dry matter (ED90) were 299.22, 1138.31 and 129.44 g a.i ha-1 of desmedipham + phenmedipham + ethofumesate, chloridazon and clopyralid, respectively. Solanum nigrum was more affected by clopyralid application (132.40 g a.i ha-1), and did not make significant difference in Portulaca oleracea. Chloridazon had lower effect for control of Chenopodium album due to existence of powdery covering on abaxial side of the leaves. Biomass ED50 or ED90, based on log-logistic dose–response curves, for Chenopodium album was considerably higher than other species. These results showed that tank mixtures with other herbicides may be required for satisfactory weed control and reduction in applied herbicides doses.

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Published
2014-12-08
How to Cite
CHITBAND, A. A., GHORBANI, R., RASHED MOHASSEL, M. H., ABBASPOOR, M., & ABBASI, R. (2014). Evaluation of Broadleaf Weeds Control with Selectivity of Post-Emergence Herbicides in Sugar Beet (Beta vulgaris L.). Notulae Scientia Biologicae, 6(4), 491-497. https://doi.org/10.15835/nsb649457
Section
Research articles
CITATION
DOI: 10.15835/nsb649457