Banca de DEFESA: RUBIA DE MOURA CARNEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RUBIA DE MOURA CARNEIRO
DATE: 20/05/2021
TIME: 09:00
LOCAL: Webconferência
TITLE:

Chemical management in the control of plants of the genus Commelina

KEY WORDS:

C. benghalensis, C. diffusa, tolerance, post-emergent, pre-emergent.

PAGES: 100
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitotecnia
SPECIALTY: Matologia
SUMMARY:

The species Commelina benghalensis and Commelina diffusa, are difficult to control, due to the ease of propagation and tolerance to the herbicide glyphosate. The present work aimed to evaluate the control of C. benghalensis and C. diffusa species, through the application of post and pre-emergent herbicides, specifications alone and in mixture. Four experiments were carried out (EI, EII, EIII and EIV), three of them, conducted in replicate (RI, RII and RIV). The experiments EI and EII (replicates RI and RII), aimed to evaluate the control of both species in post-emergence, with different number of leaves, being from 4 to 6 (EI and RI) and from 6 to 10 leaves (EII and RII), respectively. Experiments EI and EII were conducted in emergency, with 22 treatments, in applications or in mixture, of the herbicides glyphosate, saflufenacil, carfentrazone, 2,4-D, triclopyr, dicamba, flumioxazin, chlorimuron and chloransulam. The replicate assays (RI and RII), were conducted with 27 treatments for both species, with the same criteria used for EI and EII, meanwhile it was added to the treatment diclosulam + halauxifen distributed alone and in mixture. Transient fluorescence analyzes of chlorophyll a, visual analysis of control, shoot length and dry mass were performed. A physical-chemical compatibility test was carried out with the 27 treatments of the post-emergent replicate experiment. The EIII experiment was carried out for the quantification of hydrogen peroxide in the two species studied, being conducted with 10 treatments, with isolated application and in a mixture of the herbicides glyphosate, 2,4-D, triclopyr, flumioxazin, saflufenacil, carfentrazone and control. The experiment with pre-emergent herbicides (EIV) was carried out in replicate (RIV). Both experiments were seeded with C. benghalensis, containing 10 treatments, these being: diclosulam, s-metolachlor, imazetapyr + flumioxazin, flumioxazin, imazetapyr, sulfentrazone + diuron, clomazone and control. The EV experiment was carried out to evaluate the residual effect of the RIV experiment, where a new sowing was carried out in the pots at 42 DAE. The effectiveness of controlling and counting the number of emerged plants was evaluated. The data of the experiments were submitted to ANOVA (p ≤ 0.05), being significant, they were compared by the Skott-Knott test (EI, EII, RI and RII) and Tukey (EIII, EIV, RIV and EV). The species of C. benghalensis and C. diffusa, showed similar behavior in the post-emergent experiments. The dicamba applied alone, did not present control for the two species evaluated. Control of plants was observed when mixed with glyphosate herbicide and PROTOX inhibitors for C. benghalensis plants. The mixture of glyphosate with chlorimuron or chloransulam, was efficient only for C. diffusa. In the residual (EV) experiment, flumioxazin, imazetapyr and imazetapyr + flumioxazin (0.5L ha-1), showed no control for C. benghalensis. It is concluded that the control of both species in post-emergence, should be performed from 4 to 6 leaves. The use of pre-emergent herbicides promotes control of C. benghalensis, making it necessary to pay attention to the residual herbicides.

BANKING MEMBERS:
Presidente - 2466219 - CAMILA FERREIRA DE PINHO
Externo ao Programa - 1905333 - AROLDO FERREIRA LOPES MACHADO
Externa à Instituição - CRISTINA MOLL HUTHER - UFF