Management of Commelina benghalensis and Spermacoce verticillata with or without application of sequential herbicides

• Grant number: 19/10960-8
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: August 01, 2019
• End date: January 31, 2020
• Field of knowledge: Agronomical Sciences - Agronomy - Crop Science
• Principal Investigator: Patrícia Andrea Monquero
• Grantee: Ana Victória Jerônimo
• Host Institution: Centro de Ciências Agrárias (CCA). Universidade Federal de São Carlos (UFSCAR). Araras , SP, Brazil

Abstract

Increased use of RR technology (roundup ready) has resulted in problems due to the intense use of glyphosate. Weeds such as Spermacoce sp. and Commelina benghalensis are being selected in these areas due to tolerance or resistance to this herbicide. Chemical control becomes increasingly difficult when the plant is already in an advanced stage. Therefore, the objective of this project will be to evaluate the control of these weeds in advanced phenological stage using isolated herbicides and in mixture with glyphosate, followed or not sequentially with ammonium glufosinate and diquat. The work will be done in a completely randomized design in a factorial scheme (12 x 3 +1), with 12 treatments, without sequential and sequential diquat or with glufosinate ammonium, with four replicates plus the control without herbicide application. Sequential applications will be performed fifteen days after the first application. The evaluation of the control provided by the herbicides through a visual scale of injury of the plants will be done and the 35 DAA to the plants will be cut close to the ground to evaluate the dry mass of the aerial part.