A comparative analysis of the efficacies of six selected herbicides for effective control of spear grass (Imperata cylindrical Linn) in cassava production in Obudu, Northern Cross River State

A two-year, (2015 and 2016) field trial was conducted in Obudu Local Government Area of Cross River State to compare the efficacies six (6) selected herbicides controlling spear grass (Imperata cylindrical Linn) cassava farm. The main treatments were three varieties: TMS 30572, 50395 NR 8082, while sub herbicides: Primextra, Igrancombi Gold, Paracot as pre-emergence, Touchdown Forte Hi Tech, Galex Fusilade post-emergence herbicides. result showed that establishment did not differ significantly among varieties, whereas herbicide type (p<0.05) affected establishment. High plant recorded plots treated with Paracot, followed by compared high mortality rate primextra pre-emergence application. tuber yield varieties. However, on basis average for both years, trend follows: 30572 (2.81 t/ha-1) > 8082 (2.75 t/ha-1)> (2.56t/ha-1). On contrary, differed types irrespective variety, although no well-defined established.