Planta Daninha (2011) 29, 323-331

N. Zapata, M. Vargas and P. Medina (2011)
Actividad fitotóxica de un extracto N-Hexano obtenido de la corteza de Drimys winteri sobre cuatro especies de malezas
[Phytotoxic activity of N-Hexane extract obtained from Drimys winteri bark on four weeds]
Planta Daninha 29 (2), 323-331
Abstract: The objective of this research was to determine the phytotoxic effect of the n-hexane extract obtained from the bark of Drimys winteri on germination and growth of Convolvulus arvensis, Setaria pumila, Daucus carota and Cichorium intybus. The phytotoxic effects of the extract on the germination of weeds were determined by bioassays in Petri dishes, adding the extract on the germination medium at concentrations of 100 to 1,000 mg L^-1. The phytotoxic effects of the extract on the emergence and seedling growth of weeds were studied in pots bioassays, where the extract was applied mixed with the growth medium at concentrations of 500 to 4,000 mg kg^-1 . We also determined the phytotoxic effects of the extract by spraying on weed plants, at concentrations of 800 to 6,400 mg L^-1 . In germination tests, the extract delayed germination and decreased the shoot and radicle growth of all weeds, germination decreased in all weeds except C. arvensis. The application of the extract to the growth medium decreased and delayed the emergence of the weeds, plants treated with the extract had lower height and reduced accumulated biomass. The extract sprayed on plants delayed the growth of the four weed species and decreased their cumulative biomass, plant mortality was observed with the highest concentration tested for S. pumila, D. carota and C. intybus.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Spanish)
Full text of article
Database assignments for author(s): Pilar Medina

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

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Convolvulus arvensis (weed)
	Daucus carota (weed)
	Setaria pumila (weed)
	Cichorium intybus (weed)