Planta Daninha (2003) 21, 293-300

N.M.P. Dias, J.B. Regitano, P.J. Christoffoleti and V.L. Tornisielo (2003)
Absorção e translocação do herbicida diuron por espécies suscetível e tolerante de capim-colchão (Digitaria spp.)
[Absorption and translocation of the herbicide diuron by susceptible and tolerant species of crabgrass (Digitaria spp.)]
Planta Daninha 21 (2), 293-300
Abstract: The objective of this research was to compare the tolerance of two crabgrass species (Digitaria nuda and D. ciliaris) to diuron and to evaluate whether absorption and/or translocation are involved in the mechanism of tolerance to the herbicide. In order to determine the tolerance of the crabgrass species, plants at the vegetative growth stage of three true leaves were sprayed with different rates of diuron. Dose-response curves were adjusted to plant dry biomatter at 21 days after application. The absorption and translocation studies were conducted using ¹⁴C-diuron, measuring radioactivity in different plant parts at 0, 3, 6, 12, 24 and 48 hours after application. The results were expressed as percentage related to the total radioactivity recovered. The relation (T/S) between the rate required to reduce plant dry matter (GR₅₀) at 21 DAA of the species D. nuda and the GR₅₀ of D. ciliaris was 2.7, showing differential susceptibility of the species. There was no difference in the absorption by the species. Translocation was minimum in both species. It was concluded that differential absorption and/or translocation were not involved in the mechanism of tolerance to diuron present in Digitaria nuda crabgrass species.
(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

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Digitaria ciliaris (weed)
	Digitaria nuda (weed)