Weed Science (1998) 46, 442-446

Graham W. Charles, Robert D. Murison and Steven Harden (1998)
Competition of noogoora burr (Xanthium occidentale) and fierce thornapple (Datura ferox) with cotton (Gossypium hirsutum)
Weed Science 46 (4), 442-446
Abstract: Competitiveness of noogoora burr and fierce thornapple in irrigated cotton was assessed using area-of-influence methodology. Lint yields were regressed against distances from the weeds using spline regression. The resulting regression curves were used to estimate areas of influence and yield losses, which were further modeled as functions of weed size to understand weed competitiveness. Cotton lint yield reductions averaged 36 and 12%, with maximum distances of influence of 1.71 and 1.65 m for noogoora burr and fierce thornapple, respectively. Economic thresholds for control using hand hoeing were related to weed size. Thresholds for average-size weeds were one cocklebur in 195 m and one fierce thornapple in 73 m of cotton row.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Graham W. Charles

Research topic(s) for pests/diseases/weeds:
damage/losses/economics

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Xanthium strumarium (weed)	Cotton (Gossypium)
	Datura ferox (weed)	Cotton (Gossypium)