Selectivity of herbicides applied with mineral oil in cassava ‘Cascuda’

Abstract

The use of adjuvant can influence the selectivity of herbicides on crops. Aimed to evaluate the selectivity of herbicides with different concentrations of mineral oil adjuvant in cassava 'Cascuda'. The experimental design was a randomized block design with four replications. We used a factorial design 3x3+1 which consisted of three herbicides clethodim (120 g ha^-1), fluazifop-p-butyl (250 g ha^-1) and mesotrione (240 g ha^-1), three concentrations of mineral oil (Assist^®) 0.0, 0.5 and 1.0% v v^-1, and a control without application. All plots were kept free of weed interference by hand weeding. Only the mesotrione promoted phytointoxication mild to moderate (5.5 to 51.3%) when applied with mineral oil. However, all herbicides were selective for cassava plants 'Cascuda' in applied both in the presence and absence of mineral oil to 1% v v^-1