Critical periods of weed control for naked crabgrass (Digitaria nuda), a grass weed in corn in South Africa

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dc.contributor.author Hugo, Elbé
dc.contributor.author Morey, Liesl
dc.contributor.author Saayman-Du Toit, Anna E.J.
dc.contributor.author Reinhardt, Carl Frederick (Charlie)
dc.date.accessioned 2015-03-27T06:23:40Z
dc.date.available 2015-03-27T06:23:40Z
dc.date.issued 2014-10
dc.description.abstract Difficulties in chemically controlling large crabgrass in corn in South Africa have recently been attributed to the occurrence of naked crabgrass. In contrast to large crabgrass, naked crabgrass is not easily controlled with acetanilide herbicides. Critical periods of weed control (CPWC) for naked crabgrass in corn was determined in field studies during the 2009/2010 and 2010/2011 growing seasons at two separate localities for an early and late planting date of corn. Weed-free and weed–crop interference treatments of increasing duration were maintained at various crop growth stages in the presence of naked crabgrass. Biomass of naked crabgrass was determined as dry weight per square meter quadrant, which yielded 428 g m22 at Potchefstroom and 594 g m22 at Wesselsbron. An exponential regression model was used to determine the CPWC expressed as growing degree days after crop emergence, on the basis of an estimated 10% relative yield loss in corn. The onset and ending, as well as the duration of the CPWC, differed between seasons and localities. At 10% relative yield loss, the onset of the CPWC ranged between the two-leaf (V2) and six-leaf (V6) stages, and the ending between the 12-leaf (V12) stage and 2 wk after tasseling (T + 2). The duration of the CPWC ranged between 22 and 80 d for the respective planting dates, years, and localities. Yield losses ranged from 28 to 82% in the season-long weedy plots. The shifting of planting dates alone did not reduce yield losses since the effect of late infestations of naked crabgrass is significant. Naked crabgrass control from crop emergence is essential, followed by POST herbicide application during the critical period of weed control to lower the risk of corn yield losses. en_ZA
dc.description.librarian hb2015 en_ZA
dc.description.sponsorship Maize Trust of South Africa and the Agricultural Research Council. en_ZA
dc.description.uri http://www.wssajournals.org/loi/wees en_ZA
dc.identifier.citation Hugo, E, Morey, L, Saayman-Du Toit, AEJ & Reinhardt, CF 2014, 'Critical periods of weed control for naked crabgrass (Digitaria nuda), a grass weed in corn in South Africa', Weed Science, vol. 62, no. 4, pp. 647-656. en_ZA
dc.identifier.issn 0043-1745 (print)
dc.identifier.issn 1550-2759 (online)
dc.identifier.other 10.1614/WS-D-13-00152.1
dc.identifier.uri http://hdl.handle.net/2263/44191
dc.language.iso en en_ZA
dc.publisher Weed Science Society of America en_ZA
dc.rights © 2014 The Weed Science Society of America en_ZA
dc.subject Critical period duration en_ZA
dc.subject Grass weeds en_ZA
dc.subject Weed control en_ZA
dc.subject Yield loss en_ZA
dc.subject Critical periods of weed control (CPWC) en_ZA
dc.title Critical periods of weed control for naked crabgrass (Digitaria nuda), a grass weed in corn in South Africa en_ZA
dc.type Postprint Article en_ZA


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