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Red Rice (Oryza sativa) Control and Seedhead Reduction with Glyphosate

Published online by Cambridge University Press:  12 June 2017

Shawn D. Askew ,
David R. Shaw  and
Joe E. Street
Shawn D. Askew
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
David R. Shaw*
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
Joe E. Street
Affiliation:
Delta Research and Extension Center, Stoneville, MS 38776
*
Address correspondence to: David R. Shaw, Mississippi State University, Plant and Soil Sciences Department, Box 9555, Mississippi State, MS 39762, E-mail: dshaw@weedscience.msstate.edu
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Abstract

Glyphosate was evaluated at 0.8, 1.3, and 1.7 kg ae/ha applied at the two-leaf, four-leaf, or two- to three-tiller growth stage for red rice control. In addition, red rice seedheads were counted concurrently with soybean harvest at each of three locations to assess treatment effect on seedhead reduction. Field studies were conducted at Starkville, MS, in 1994 and 1995 and Shaw, MS, in 1995. A significant rate response was not observed for red rice control 2 and 4 wk after treatment (WAT) or for seedhead reductions. Glyphosate controlled red rice 88, 91, and 88% 2 WAT when applied to two-leaf, four-leaf, or two- to three-tiller red rice, respectively. Due to subsequent seedling emergence, control from glyphosate applications to two- or four-leaf red rice 4 WAT was 51 and 84%, respectively. Red rice treated at the two- to three-tiller stage was controlled 91% 4 WAT. When compared to the nontreated control, seedheads were reduced 97% by two- to three-tiller applications, compared to 87 and 56% reductions from four- and two-leaf applications, respectively.

Keywords

Glyphosate, N-(phosphonomethyl)glycinered rice, Oryza sativa L. # ORYSAsoybean, Glycine max (L.) Merr.Application timingtransgenic soybeanGlycine maxORYSAPOST, postemergence over-the-topWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 12 , Issue 3 , September 1998 , pp. 504 - 506
Copyright
Copyright © 1998 by the Weed Science Society of America 

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