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

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.

Performance of some Sugar Beet (Beta vulgaris L.) Cultivars under Annual Weed Control Condition

“…by 66.8 and 56.3%, respectively. These results are in good harmony with those obtained by (Chitband et al, 2014) who stated that desmedipham + phenmedipham + ethofumesate were more potent than that of chloridazon and clopyralid against Portulaca oleracea, Solanum nigrum, Amaranthus retroflexus and Chenopodium album. The same conclusion was mentioned by (Mahmoud and Soliman, 2012).…”

“…Mixtures of post-emergence herbicides have to be applied to control the wide range of weed species in sugar beet crop, (Scepanovic 2007, Deveikyte andSeibutis, 2006). Chitband et al (2014) found that desmedipham + phenmedipham + ethofumesate, tank mixtures for satisfactory weed control and reduction Portulaca oleracea, Solanum nigrum, Amaranthus retroflexus and Chenopodium album. The objectives of this study, to evaluate the integration between sugar beet cultivars and some readymade herbicides such as Goltix plus, Goltix, Cross, and/or Harness on weed control and sugar beet yields and its components.…”

Evaluation of Pre- and Postemergence Herbicide Combinations for Broadleaved Weeds in Sugar Beet

“…ha -1 ) as compared to other herbicide combinations. Other studies also have reported that phenmedipham plus desmedipham plus ethofumesate was more effective for controlling weeds by applying in a mixture with metamitron than by applying alone phenmedipham plus desmedipham plus ethofumesate [54,55]. The combination of herbicides decreased sugar beet root yield as compared to the handweeded check (Control I).…”