Planta Daninha (2009) 27, 303-307

E. Puricelli and D. Faccini (2009)
Efecto de la dosis de glifosato sobre la biomasa de malezas de barbecho al estado vegetativo y reproductivo
[Glyphosate dose effect on weed biomass at the vegetative and reproductive stage]
Planta Daninha 27 (2), 303-307
Abstract: Experiments were conducted at the University of Rosario Experimental Farm, Zavalla in 2005 and 2006 to study the effect of glyphosate on the control of Convolvulus arvensis, Oenothera indecora, Iresine diffusa, Parietaria debilis, Rumex paraguayensis and Trifolium repens at the vegetative and reproductive stage. The experiments were established in a complete randomized design with the following factorial arrangement of treatments: year, species, vegetative and reproductive growth stages and glyphosate 48% (4X, 2X, 1X, 1/2X, 1/4X, 0X) being 1X the recommended dose (1,200 g a.i. ha^-1). The relationship between glyphosate dose and weed biomass control was established with a log-logistic model. The degree of tolerance was compared by LD₅₀. In both stages, the higher LD₅₀ was obtained for I. diffusa indicating that this is the species most tolerant to glyphosate among those studied. The number of species tolerant to glyphosate is lower at the vegetative stage than at the reproductive stage.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Spanish)
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Database assignments for author(s): Eduardo C. Puricelli

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Convolvulus arvensis (weed)		Argentina
	Parietaria debilis (weed)		Argentina
	Trifolium repens (weed)		Argentina
	Oenothera indecora (weed)		Argentina
	Iresine diffusa (weed)		Argentina
	Rumex paraguayensis (weed)		Argentina