Response of different Digitaria insularis populations to glyphosate

Planta Daninha

Correia, N.M¹  Garcia, L.D¹  Syngenta Proteção de Cultivos Ltda, Jaboticabal, Brasil¹  UNESP¹  Leite, G.J¹  Universidade Estadual Paulista, Jaboticabal, Brasil¹ 

关键词: chemical control;    sourgrass;    desiccation;    tolerant.;   

DOI  :  10.1590/S0100-83582010000400009

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

The objective of this study was to evaluate the chemical control of different sourgrass (Digitaria insularis) populations by the herbicide glyphosate through dose-response curves, besides considering alternative treatments to control tolerant populations. A randomized block design was used with four replications, in a factorial scheme (5 x 9). Sourgrass seeds were colleted from five locations: a grain production area located at the educational, research and production farm of UNESP, Jaboticabal-SP; a grain production area located in the agricultural area of Campo Florido, MG, and Rio Verde, GO; citrus production area located in the agricultural area of Matão, SP, and an area without previous glyphosate application (Jaboticabal-SP). Glyphosate (0D, 1/4D, 1/2D, D, 2D, 4D and 8D, where D is the recommended rate of 1.5 kg ha-1 of acid equivalent) and its associations [glyphosate plus fluazifop-p-butyl (1.5 plus 0.25 kg ha-1) and glyphosate (1.5 kg ha-1) in sequence with diuron plus paraquat (0.20 plus 0.40 kg ha-1 plus 0.2% of surfactant)] were sprayed on the 7-8 tiller plants with average height of 20 cm. Campo Florido, MG and Rio Verde, GO sourgrass populations were considered susceptible; those of Jaboticabal-SP and Matão,SP were found to be tolerant and those from the nonagricultural area were considered of intermediate sensitivity. The association of glyphosate with fluazifop, or its application in sequence with diuron plus paraquat, were efficient in the control of sourgrass tolerant populations.

【 授权许可】

Unknown