Alternative herbicides to control glyphosate-resistant biotypes of Conyza bonariensis and C. canadensis

Planta Daninha

Moreira, M.S.¹  USP¹  Melo, M.S.C.¹  Crhistoffoleti, P.J.¹  Nicolai, M.¹  Syngenta do Brasil¹  Carvalho, S.J.P.¹ 

关键词: horseweed;    resistance;    EPSPs;    diuron;    atrazine;    ammonium-glufosinate.;   

DOI  :  10.1590/S0100-83582010000100020

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 】

After successive years, glyphosate applications on São Paulo-Brazil citrus orchards selected resistant biotypes of Conyza bonariensis and C. canadensis. The occurrence of herbicide-resistant weed biotypes at some agricultural area makes it necessary to change the management practices to reach effective control of the selected resistant populations, as well as to reduce selection pressure on the other species. Thus, this work aimed to identify the alternative herbicides to control glyphosate-resistant biotypes of Conyza spp., with applications at different weed phenological stages. Three trials were developed under field conditions: in citrus orchards under formation, in plants with phenological stages of ten leaves and at pre-flowering. For plants at the ten leaf stage, satisfactory control was reached with applications of glyphosate + bromacil + diuron (1,440 + 1,200 + 1,200 g ha-1), glyphosate + atrazine (1,440 + 1,500 g ha-1) and glyphosate + diuron (1,440 + 1,500 g ha-1). For Conyza spp. plants at the pre-flowering stage, ammonium-glufosinate application, at the rate of 400 g ha-1, isolated or associated to MSMA, bromacil+diuron, metsulfuron, carfentrazone and paraquat, was a viable alternative to control glyphosate-resistant biotypes.

【 授权许可】

Unknown