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Broadleaf Weed Control in Ultra Narrow Row Bromoxynil-Resistant Cotton (Gossypium hirsutum)

Published online by Cambridge University Press:  20 January 2017

Krishna N. Reddy
Krishna N. Reddy*
Affiliation:
Southern Weed Science Research Unit, United States Department of Agriculture, Agricultural Research Service, P.O. Box 350, Stoneville, MS 38776
*
E-mail: [email protected].
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Abstract

A field experiment was conducted over 2 yr to study efficacy of bromoxynil mixtures with pyrithiobac or MSMA applied postemergence (POST) with and without fluometuron or fluometuron plus pendimethalin preemergence (PRE) for control of broadleaf weeds in ultra narrow row bromoxynil-resistant cotton in the Mississippi Delta. Bromoxynil applied POST (single or sequential) provided variable control of common purslane (<9%), sicklepod (<35%), Palmer amaranth (<46%), prickly sida (>75%), hyssop spurge (>79%), hemp sesbania (>96%), and pitted morningglory (100%) at 4 wk after early POST (WAT). Broadleaf weed control increased when PRE herbicides were followed by bromoxynil or bromoxynil plus pyrithiobac or MSMA POST. Weed control generally decreased at harvest compared to 4 WAT, and the decrease was greater in bromoxynil POST-only programs compared to bromoxynil POST following PRE programs. Seed cotton yield with bromoxynil POST-only programs was lower (400 to 2,810 kg/ha) compared to bromoxynil POST programs following PRE herbicides (2,150 to 3,720 kg/ha). Early-season weed interference and variable control of weeds in bromoxynil POST-only programs resulted in greater cotton stand reduction and lower open bolls per plant compared to bromoxynil POST programs following PRE herbicides.

Keywords

BromoxynilfluometuronMSMApendimethalinpyrithiobaccommon purslane, Portulaca oleracea L. # POROLcotton, Gossypium hirsutum L. ‘BXN 47’; hemp sesbania, Sesbania exaltata (Raf.) Rydb. ex A. W. Hill # SEBEXhyssop spurge, Euphorbia hyssopifolia L. # EPHHSPalmer amaranth, Amaranthus palmeri S. Wats. # AMAPApitted morningglory, Ipomoea lacunosa L. # IPOLAprickly sida, Sida spinosa L. # SIDSPsicklepod, Senna obtusifolia (L.) Irwin & Barneby # CASOBTransgenic cottonEPOST, early postemergencefb, followed byLPOST, late postemergencePOST, postemergencePRE, preemergenceUNR, ultra narrow rowWAT, weeks after EPOST application
Type
Research
Information
Weed Technology , Volume 15 , Issue 3 , September 2001 , pp. 497 - 504
Copyright
Copyright © Weed Science Society of America 

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