The Potency of Separated and New Premix Formulations of Carfentrazone- Based Herbicide Against Annual Broadleaved Weeds in Wheat

A field study was carried out at the Experimental Farm of Assiut University, Egypt during 2019–2020 and 2020–2021 to evaluate the potency of carfentrazone (CARF) alone and four new premixes of carfentrazone + dicamba (CARF+DICA), carfentrazone + tribenuron (CARF+TRIB), carfentrazone + fenoxaprop (CARF + FENO), and carfentrazone + fenoxaprop + tralkoxydim (CARF + FENO + TRAL), on broadleaved weed and its influence on the productivity of winter wheat. Wheat fields were infested with different annual broad-leaved weeds during the study years and Rumex dentatus L., Chenopodium album L., and Beta vulgaris L. were the dominant weed species. All herbicide treatments performed a high efficacy against broadleaved weeds in wheat fields 30 days after herbicide treatments (DAHT) in both years. All tested herbicides achieved 95.24–96.30% and 84.92–96.65% in controlling broad-leaved weeds and significantly reduced fresh weed biomass by 99.14–99.87% and 98.20–99.68% in the first and second year, respectively, compared with control. CARF+DICA caused severe injury to the flag leaves of wheat and performed alteration in spike and spikelet form that resulted in a significant reduction in grain yield by 47.37 and 16.28%, in the first and second year compared to the control, respectively. CARF+DICA should not be used to control weeds in wheat cultivar 'Sids 14'.  Other tested herbicides caused a slightly visible injury on the leaves of wheat in the first days after application but the injury disappeared after 28 DAHT, without any effect on crop yield. All herbicides except CARF+DICA resulted in significantly higher biological yield and grain yield than the control and CARF+DICA. CARF+FENO and CARF+FENO+TRAL resulted in the highest biological yield and grain yield in both years followed by CARF+TRIB (in 2020–2021) and CARF (in 2019–2020) compared to the control. All herbicides except CARF+DICA are considered new promising options for the control of broad-leaved weeds in common wheat in the Upper Egypt region.