EFFICACY OF HERBICIDES IN THE CONTROL OF MORNING GLORY

Abstract

The good establishment of agricultural crops depends on several factors related to the way weeds are managed. Morning glory (Ipomoea sp.) Is one of the most problematic weeds in agricultural crops in Brazil, causing a reduction in production and making harvesting operations more difficult. In this sense, the objective was to evaluate the effectiveness of different herbicides applied in post-emergence of viola string. The experiment was conducted from July to September 2018 in a greenhouse. The experimental design used was a randomized block (DBC), with six treatments (T1 - glyphosate, T2 - chlorimuron-ethyl, T3 - metsulfuron-methyl, T4 - carfentrazone-ethyl, T5 - saflufenacil, T6 - control without herbicide application), with four repetitions. To determine the effectiveness of control, phytointoxication assessments were made based on a visual scale at 7, 14 and 21 days after application. In the same period, root length, shoot and total length, stem diameter and total dry matter of the plant were measured. Carfentrazone-ethyl (30 g a.i. ha-1) and saflufenacil (35 a.i. Glyphosate 1920 g e.a. ha-1), chlorimuron-ethyl (12.5 g a.i. ha-1) and metsulfuron-methyl (3.6 g a.i ha-1) are not recommended for the control of morning glory (Ipomoea sp.) due to the low percentage of control.