Strategies of chemical management for weed control in cassava

Abstract

The use of strategies such as sequential applications and mixtures may increase the control spectrum and the residual effect of chemical control of weed in the cassava crop. Thus, the objective was to evaluate the selectivity and efficacy of sequential applications and tank mixture of herbicides in the control of weed in the cassava crop cultivar 'Baianinha'. The experimental design was of randomized blocks, with eleven treatments and four replicates. The treatments consisted in: harrowed control, control without harrow, clomazone, mesotrione, S-metolachlor, clomazone+S-metolachlor, mesotrione+S-metolachlor, clomazone+mesotrione, sulfentrazone/clomazone, clomazone/[mesotrione+S-metolachlor], S-metolachlor/[mesotrione+clomazone]. The doses used for clomazone, mesotrione, sulfentrazone and S-metolachlor in the single applications, in sequence and in tank mixture were of 1.25, 0.24; 0.6 and 1.92 kg ha -1 , respectively. The first application of the sequential treatments occurred 50 days after planting (DAP) and the second at 92 DAP. The applications of mesotrione, mesotrione+clomazone and mesotrione+S-metolachlor, were carried late, at 92 DAP. Based on the data obtained, it is concluded that the mixture mesotrione+S-metolachlor and the sequential application of clomazone/ [mesotrione+S-metolachlor] were selective to cassava 'Baianinha' and efficient in the weed control (over 80% up to 148 days after planting).

Weed coexistence periods in cassava varieties

“…Among the main problems that limit the productive potential of the cassava crop, the interference of weeds stands out (Costa et al, 2020a). However, there are studies that indicate that the crop can remain up to 25 days in coexistence with weeds (Period Prior to Interference -PPI), without damaging their development and root production (Johanns & Contiero, 2006;Biffe et al, 2010).…”

Evaluación de la selectividad y efectividad de distintos herbicidas para el control de malezas en el cultivo de mandioca (<i>Manihot esculenta</i> Crantz) en Corrientes

“…Entre los principios activos de herbicidas pre-emergentes evaluados para el control de malezas en mandioca se encuentran: Diuron, S-metolacloro, Clomazone y Pendimetalin (Oliveira et al, 2001 a y b;Matheus et al, 2004;Pletsch, 2004;Biffe et al, 2007;Biffe et al, 2010;Scariot et al 2013;Franciscon et al, 2016;Pinto Ruiz et al, 2019;Da Costa et al 2020).…”