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Improved chemical control of Conyza bonariensis in wheat limits problems in the following fallow

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Walker, S., Widderick, M. J., McLean, A., Cook, T. and Davidson, B. (2013) Improved chemical control of Conyza bonariensis in wheat limits problems in the following fallow. Weed Biology and Management, 13 (4). pp. 144-150. ISSN 1444-6162

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Article Link: http://dx.doi.org/10.1111/wbm.12021


Conyza bonariensis is a major weed infesting zero-tilled cropping systems in subtropical Australia, particularly in wheat and winter fallows. Uncontrolled C.bonariensis survives to become a problem weed in the following crops or fallows. As no herbicide has been registered for C.bonariensis in wheat, the effectiveness of 11 herbicides, currently registered for other broad-leaved weeds in wheat, was evaluated in two pot and two field experiments. As previous research showed that the age of C.bonariensis, and to a lesser extent, the soil moisture at spraying affected herbicide efficacy, these factors also were investigated. The efficacy of the majority of herbicide treatments was reduced when large rosettes (5-15cm diameter) were treated, compared with small rosettes (<5cm diameter). However, for the majority of herbicide treatments, the soil moisture did not affect the herbicide efficacy in the pot experiments. In the field, a delay in herbicide treatment of 2 weeks reduced the herbicide efficacy consistently across herbicide treatments, which was related to weed age but not to soil moisture differences. Across all the experiments, four herbicides controlled C.bonariensis in wheat consistently (83-100%): 2,4-D; aminopyralid + fluroxypyr; picloram + MCPA + metsulfuron; and picloram + high rates of 2,4-D. Thus, this problem weed can be effectively and consistently controlled in wheat, particularly when small rosettes are treated, and therefore C.bonariensis will have a less adverse impact on the following fallow or crop.

Item Type:Article
Business groups:Crop and Food Science
Keywords:2,4-D, aminopyralid, fluroxypyr, MCPA, metsulfuron, picloram l. cronquist, translocation, efficacy, repens
Subjects:Plant culture > Field crops > Wheat
Science > Invasive Species > Plants > Effect of herbicides
Plant pests and diseases > Weeds, parasitic plants etc
Live Archive:21 Aug 2014 02:37
Last Modified:23 Feb 2023 01:05

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