CHEMICAL CONTROL STRATEGIES OF Commelina benghalensis IN COFFEE CROP

Abstract

<p> The present study aims to evaluate the control of C. benghalensis by herbicides applied in post-emergence and in pre-emergence sequentially in the infesting weed in the coffee crop. Two field experiments were carried out in a coffee crop, with natural infestation of C. benghalensis, the experimental design of both was completely randomized with 4 replicates. The first experiment, involving a single application of herbicides in post-emergence presented the following treatments: (1) saflufenacil (70 g i.a. ha-1); (2) glufosinate (400 g i.a. ha-1); (3) carfentrazone (20 g i.a. ha-1); (4) flumioxazin (120 g i.a. ha-1); (5) metsulfuron (6 g i.a. ha-1), and (6) witness (without application of herbicide). In the second experiment, the treatments were: (1) saflufenacil (70 g i.a. ha-1); (2) carfentrazone (20 g i.a. ha-1); (3) flumioxazin (120 g i.a. ha-1); (4) metsulfuron (6 g i.a. ha-1), all these treatments with a sequence of indaziflam (75 g i.a. ha-1), at 21 days after the application of the treatments (DAT) of pos-emerging; (5) Witness (without application of herbicides). In the first experiment the herbicides safluenacil and flumioxazin presented the best percentages of control in post-emergence with 90 and 85.25% respectively, at 7 DAT, keeping the control superior to 80% at 21 DAT. In the second experiment, the treatments saflufenacil and flumioxazin with indaziflam sequential, presented control of 80% and 82.5% respectively at 28DAA (Days After Application). The herbicides saflufenacil and fluxioxazin represent an option for the control of C. benghalensis in post-emergence and favor the performance of the sequentially applied indaziflam herbicide. </p>

Estratégias de controle de Conyza spp. em pré-plantio da soja: Aplicações únicas ou sequenciais?

“…Isso acontece, pois a maior eficácia do carfentrazone está direcionada as espécies dos gêneros Commelina spp e Ipomoea spp. (Christoffoleti et al, 2016, Da Silva et al, 2019, portanto, independente do estádio das plantas de buva, este herbicida não será a melhor ferramenta no controle.…”

Management strategies for Anredera cordifolia in coffee culture

“…This fact was confirmed by Silva et al (2019), who aimed to control Commelina benghalensis (Bengal dayflower) in a coffee crop and observed better control effects when the first post-emergence application was applied with the herbicides saflufenacil and flumioxazin, which are PROTOX (enzyme protoporphyrinogen oxidase) inhibitors, and an indaziflam sequence, obtaining control of 80 and 82.5%, respectively, at 28 DAA (days after application) at the expense of reducing the soil cover. However, control over 80% was obtained only when the first herbicide application was placed with effective efficacy both for the post-emergence and pre-emergence of weeds, i.a., when the first application consisted of flumioxazin + glyphosate and metsulfuron + glyphosate (AGROFIT, 2022); the latter, although not recommended for pre-emergence application on weeds in a coffee crop, has residual weed control and is even used as a pre-emergence herbicide in other crops (sugar cane and wheat).…”

Pre-emergent herbicides: benefits and restrictions for rational use

“…Although the development recommendations of most products mention the need of 10 mm of rainfall for these to be activated, for some herbicides the amount of rainfall needed for good control can be higher. This is reported for the control of Euphorbia heterophylla with flumioxazin (13) .…”