Planta Daninha (2008) 26, 467-471

F.P. Lamego and R.A. Vidal (2008)
Resistência ao glyphosate em biótipos de Conyza bonariensis e Conyza canadensis no Estado do Rio Grande do Sul, Brasil
[Resistance to glyphosate in Conyza bonariensis and Conyza canadensis biotypes in Rio Grande do Sul, Brazil]
Planta Daninha 26 (2), 467-471
Abstract: 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
Full text of article
Database assignments for author(s): Fabiane P. Lamego, Ribas Antonio Vidal

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Erigeron canadensis (weed)		Brazil (south)
	Erigeron bonariensis (weed)		Brazil (south)