Resistance to glyphosate in Conyza bonariensis and Conyza canadensis biotypes in Rio Grande do Sul, Brazil

Planta Daninha

Lamego, F.P.¹  UFRGS¹  UFRGS, Porto Alegre¹  Vidal, R.A.¹ 

关键词: marestail;    EPSPS;    herbicide;    horseweed.;   

DOI  :  10.1590/S0100-83582008000200024

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 】

Dose-response experiments were conducted to evaluate the occurrence of resistance to glyphosate in Conyza canadensis and Conyza bonariensis biotypes originated from Rio Grande do Sul counties. For each species, one experiment was conducted with two biotypes, one susceptible and one suspected of resistance. Glyphosate rates of 0, 100, 200, 300, 400, 800 and 1200 g ha-1 were sprayed on the plants after reaching the 8-10 leaf growth stage. Sigmoidal curves were adjusted to each biotype tested. Resistance to glyphosate was confirmed for biotypes of both species with resistance factor of 2.3.

【 授权许可】

Unknown