Planta Daninha (2011) 29, 217-227

J.M. Paula, L. Vargas, D. Agostinetto and M.A. Nohatto (2011)
Manejo de Conyza bonariensis resistente ao herbicida glyphosate
[Management of Glyphosate-resistant Conyza bonariensis]
Planta Daninha 29 (1), 217-227
Abstract: Horseweed (Conyza bonariensis), which belongs to the Asteraceae family, is a weed species widely spread in Brazil. Horseweed biotypes resistant to glyphosate, the main herbicide used in Roundup Ready soybean fields, were identified in the states of Rio Grande do Sul and Parana. The aim of this study was to evaluate the effect of different winter and pre-sowing management techniques on soybean plant population of C. bonariensis resistant to glyphosate. The results showed that the population of C. bonariensis is larger in areas maintained fallow than in areas planted with wheat or oats during the winter. Wheat and oats were found to exert a suppressive effect on the population of C. bonariensis, providing greater ease of control with herbicide before seeding in the culture used in succession. The control of glyphosate-resistant C. bonariensis was satisfactory when post-emergence herbicides were used in wheat crop and glyphosate and 2,4-D or glyphosate paraquat diuron in pre-planting soybeans.
(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): Leandro Vargas

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

---

Pest and/or beneficial records:

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