Title:	Control of Italian ryegrass and Alexandergrass in corn using different corn sowing date, pre- and post-emergent herbicides.
Authors:	PIASECKI, C. OVEJERO, R. F. L. PICOLI JUNIOR, G. J. BELLINI, L. F. AGOSTINETTO, D. VARGAS, L.
Affiliation:	CRISTIANO PIASECKI, Universidade Federal de Pelotas – Departamento de Fitossanidade – Centro de Herbologia – Capão do Leão (RS), Brazil. RAMIRO FERNANDO LOPEZ OVEJERO, Bayer Cropscience Brasil – São Paulo (SP), Brazil. GILMAR JOSÉ PICOLI JUNIOR, Bayer Cropscience Brasil – São Paulo (SP), Brazil. LUIZ FRANCISCO BELLINI, Bayer Cropscience Brasil – São Paulo (SP), Brazil. DIRCEU AGOSTINETTO, Universidade Federal de Pelotas – Departamento de Fitossanidade – Centro de Herbologia – Capão do Leão (RS), Brazil. LEANDRO VARGAS, CNPT.
Date Issued:	2020
Citation:	Bragantia, v. 6, p. 685-704, 2020.
Description:	Glyphosate-resistant (GR) Italian ryegrass (LOLMU) and Alexandergrass (URPLA) are troublesome weeds in corn cropping systems in Southern Brazil. The emergence pattern of those weeds is not uniform and may change according to the season?s environmental characteristics. Also, herbicide resistance has been diminishing the success of the weed control programs. The objectives of this study were to evaluate the influence of corn-sowing date on LOLMU and URPLA densities and their control provided by pre- and post-emergent herbicides. Field trials were conducted in two crop seasons in Southern Brazil consisting of three corn sowing date (August, September, and October) and the application of atrazine + S-metolachlor (residual) in corn pre-emergence in different post-emergence weed control programs with glyphosate, ammonium-glufosinate, nicosulfuron, and atrazine. The results indicated that the sowing date had a significant influence on LOLMU and URPLA densities. Corn sown in the earliest period was exposed to a higher LOLMU density, whereas corn sown in the latest period had a higher density of URPLA. Also, the application of residual herbicide at corn pre-emergence reduced both weed species densities and decreased the pressure for the control of glyphosate-resistant LOLMU for the post-emergence herbicides. The use of residual herbicides in corn pre-emergence is an efficient strategy to be considered in the LOLMU and URPLA control programs, followed by post-emergence application of glyphosate, ammonium-glufosinate, atrazine, and nicosulfuron.
NAL Thesaurus:	Atrazine Integrated weed management
Keywords:	Residual Herbicide resistance management S-metolachlor
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPT)