Weed Control J 2021; 20: e202100741

Research Article

Control of canola crop weeds with different herbicides

DOI: 10.7824/wcj.2021;20:00741

Abstract

Background

Weed interference in canola crop causes losses such as reduced grain yield and quality.

Objective

The aim of this study was to evaluate the efficacy of herbicides applied for weed control in canola and the effect on crop grain yield.

Methods

Two experiments were installed, first (I) in 2018 crop season, and second (II) in 2019, in completely randomized design, with 17 treatments and four replications each. Experiment I was installed with canola hybrid Hyola 571 CL (Clearfield®), and experiment II with Hyola 575 CL. In both tests the herbicides were: iodosulfuron, imazethapyr+imazapic, imazapic+imazapyr, imazethapyr, pyroxsulam, nicosulfuron, imazamox, diclosulam, imazaquin, chlorimuron – ethyl, sulfentrazone, sulfentrazone+diuron, pendimethalin, metsulfuron-methyl, and flumioxazin, plus two Control treatments, one free from infestation and other infested. Weeds present in the experimental area were ryegrass and turnip. At 7, 14, 21, 28, and 35 days after treatment application (DAT) weed control was assessed. After harvesting, the weight of a thousand grains and grains yield were determined.

Results

Imazapic+imazapyr and nicosulfuron presented the best control of ryegrass in both experiments. Iodosulfuron, imazethapyr+imazapic, imazapic+imazapyr, nicosulfuron, diclosulam, chlorimuron-ethyl, and metsulfuron-methyl were treatments that best controlled turnip in both experiments.

Conclusions

The highest grain yield for Hyola 571 CL was obtained with application of nicosulfuron and imazaquin, and for Hyola 575 CL with application of imazethapyr.