Planta Daninha (2006) 24, 83-90

P.J. Christoffoleti, A. Borges, M. Nicolai, S.J.P. Carvalho, R.F. López-Ovejero and P.A. Monquero (2006)
Carfentrazone-ethyl aplicado em pós-emergência para o controle de Ipomea spp. e Commelina benghalensis na cultura da cana-de-açúcar
[Carfentrazone-ethyl applied in post-emergence to control Ipomoea spp. and Commelina benghalensis in sugarcane crop]
Planta Daninha 24 (1), 83-90
Abstract: This work was aimed to evaluate the efficacy and selectivity of the herbicide carfentrazone-ethyl applied in post-emergence to control weeds in sugarcane crop and to evaluate dose-response curves of this herbicide in four species of Ipomoea spp. and Commelina benghalensis. Field experiment was carried out in post-emergence of weeds and sugarcane (cv. RB72-454).The experimental design adopted was a completely randomized block with the following treatments: carfentrazone at 5, 10, 20, 30 and 50 g ha^-1 and metribuzin at 2,400 g ha¹. The main weed species presented in the area were I. nil, I. grandifolia, I. quamoclit, Momordica charantia and C. benghalensis. The evaluations of percentage of weed control and selectivity to sugarcane crop were carried out at 15, 30 and 45 days after herbicide application. An experiment was carried out under greenhouse conditions to elaborate dose-response curves with the weeds I. nil, I. grandifolia, I hederifolia, I. quamoclit and C. benghalensis. The herbicide rates analyzed were: 10D, 4D, 2D, D, 0.5D, 0.25D, 0.125D, 0.1D and 0.01D; where D = 20 g ha^-1. Results were analyzed by dose-response curves in visual control and fresh mass. In the field experiment, results showed efficient weed control and the rate of 50 g ha^-1 was considered the best carfentrazone treatment. No chemical treatment caused visible injury in the sugarcane crop. The greenhouse experiment showed that decreasing susceptibility of Ipomoea species to carfentrazone-ethyl was: I. hederifolia > I. quamoclit > I. nil > I. grandifolia and that C. benghalensis is controlled by carfentrazone at 5 g ha^-1.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): Pedro Jacob Christoffoleti, Patrícia Andréa Monquero

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Commelina benghalensis (weed)	Sugarcane (Saccharum officinarum)	Brazil (south)
	Momordica charantia (weed)	Sugarcane (Saccharum officinarum)	Brazil (south)
	Ipomoea triloba (weed)	Sugarcane (Saccharum officinarum)	Brazil (south)
	Ipomoea quamoclit (weed)	Sugarcane (Saccharum officinarum)	Brazil (south)
	Ipomoea nil (weed)	Sugarcane (Saccharum officinarum)	Brazil (south)