Bio-efficacy of Herbicides with or without Adjuvant APSA-80 against Complex Weed Flora in Wheat Field

The effect of adjuvant APSA-80 in influencing the efficacy of clodinafop and carfentrazone against weed flora in wheat is reported based on two field studies conducted during rabi 2012–13 and 2013–14. In the first experiment, the treatments comprised of clodinafop 60 g ha⁻¹ alone and as tank-mix with APSA-80 at 0.033 and 0.133 per cent, clodinafop 40 g ha⁻¹ along with APSA-80 at 0.133 per cent, APSA-80 at 0.133 per cent alone and unsprayed control; while in the second experiment, carfentrazone 20 g ha⁻¹ alone and as tank-mix with APSA-80 at 0.033 and 0.133 per cent, tank mix of carfentrazone 13.3 g ha⁻¹ with APSA-80 at 0.133 per cent, APSA-80 at 0.133 per cent alone and unsprayed control. The addition of APSA-80 did not influence the efficacy of clodinafop against littleseed canary grass and carfentrazone against broadleaf weeds and failed to influence the growth and grain yield of wheat. APSA-80 did not show any significant positive effect on the efficacy of post-emergence herbicides.