Screening and Safety Evaluation of Post-emergence Herbicides for Controlling Broadleaf Weeds in Sesame Fields
To explore safe and efficient chemical weed control technologies for sesame after emergence,the herbicides that exhibit high safety for sesame and have good control effects on broadleaf weeds were screened through indoor potting experiments and field trials.The results of the indoor trials showed that among the 17 broadleaf herbicides,only isoproturon and bentazone were discovered to be highly safe for sesame.Futher,the safety of isoproturon and bentazone to sesame and their control efficacy against broadleaf weeds were evaluated through field trials.The results showed that the treatment of isoproturon at 420-630 g/ha(active ingredient,the same below)caused phytotoxicity in sesame,such as the emergence of drug spots and growth inhibition,etc.Nevertheless,sesame growth recovered to normal within 30 d after the treatment.Sesame treated with 336-420 g/ha bentazone had significantly higher plant height than the control treatment at 30 d after the treatment,but was significantly lower than the artificial weeding treatment.The total plant control efficacy of isoproturon at 420-630 g/ha against broadleaf weeds such as Acalypha australis L.and Clinopodium polycephalum Vaniot was 84.00％—90.40％,the total fresh weight control efficacy was 87.62％—94.30％,and the sesame seed yield increased by more than 37％.The control efficacy of bentazone at a dosage of 336-504 g/ha against Acalypha australis L.was unsatisfactory,with the total plant control efficiency being lower than 40％and the total fresh weight control efficiency being lower than 57％,and sesame yield was merely increased by 11.53％—14.72％.In conclusion,the application of isoproturon at 420-630 g/ha during the 5-6 leaves stage of sesame is safe and can be used for the control of broadleaf weeds in sesame fields,presenting significant application prospects.
SesameIsoproturonBentazoneStem and leaf treatmentPhytotoxicityEfficacy
万方数据
维普
