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Weed Control and Cotton (Gossypium hirsutum) Response to Preplant Applications of Dicamba, 2,4-D, and Diflufenzopyr plus Dicamba

Published online by Cambridge University Press:  20 January 2017

John D. Everitt  and
J. Wayne Keeling
John D. Everitt
Affiliation:
Texas Agricultural Experiment Station, 1102 E. FM 1294, Lubbock, TX 79403
J. Wayne Keeling*
Affiliation:
Texas Agricultural Experiment Station, 1102 E. FM 1294, Lubbock, TX 79403
*
Corresponding author's E-mail: w-keeling@tamu.edu
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Abstract

Conservation tillage systems, used successfully by cotton producers on the Texas southern High Plains, have facilitated the development of new weed problems including horseweed (Conyza canadensis) and Russian thistle (Salsola iberica). Studies were conducted in 2004 and 2005 near Lubbock, TX to evaluate winter weed control with (2,4-dichlorophenoxy)acetic acid (2,4-D), dicamba, and diflufenzopyr plus dicamba. All of these herbicides have current registration restrictions limiting their use in cotton. Cotton response studies were initiated in 2003 and repeated in 2004 and 2005 to evaluate cotton injury and yield from dicamba (0.14 and 0.28 kg ai/ha), diflufenzopyr plus dicamba (0.10 and 0.20 kg/ha), and 2,4-D (0.56 and 1.12 kg/ha) applied 4, 2, and 1 wk before planting (WBP); and to determine the minimum interval between application of these herbicides and cotton planting without affecting yield. 2,4-D controlled both horseweed and Russian thistle, and could be applied as close as 2 WBP without injuring cotton. However, dicamba as well as diflufenzopyr plus dicamba were less effective on horseweed and Russian thistle as size increased and both injured cotton regardless of interval between application and planting.

Keywords

Dicambadiflufenzopyr plus dicamba2,4-Dhorseweed, Conyza canadensis (L.) Cronq. ERICARussian thistle, Salsola iberica Sennen & Pau SASKRcotton, Gossypium hirsutum, L.Preplant burndownwinter annual weeds
Type
Research
Information
Weed Technology , Volume 21 , Issue 2 , June 2007 , pp. 506 - 510
Copyright
Copyright © Weed Science Society of America 

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