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Competition of noogoora burr (Xanthium occidentale) and fierce thornapple (Datura ferox) with cotton (Gossypium hirsutum)

Published online by Cambridge University Press:  12 June 2017

Graham W. Charles ,
Robert D. Murison  and
Steven Harden
Robert D. Murison
Affiliation:
School of Mathematics and Computing Science, University of New England, Armidale, NSW 2351, Australia
Steven Harden
Affiliation:
NSW Agriculture, Tamworrh Center for Crop Improvement, Tamworth, NSW 2340, Australia
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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.

Keywords

Noogoora burr (Australian common name)Xanthium occidentale Bertol. XANSIfierce thornapple, Datura ferox L.cotton, Gossypium hirsutum L. ‘Siokra 1–4.'Area of influencedistance of influencecompetitionyield lossspline regressionXANSI
Type
Weed Biology and Ecology
Information
Weed Science , Volume 46 , Issue 4 , August 1998 , pp. 442 - 446
Copyright
Copyright © 1998 by the Weed Science Society of America 

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