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Comparison of Preemergence and Postemergence Weed Control Systems in Newly Established Pecan

Published online by Cambridge University Press:  20 January 2017

Wilson H. Faircloth ,
Michael G. Patterson ,
Wheeler G. Foshee ,
Monte L. Nesbitt  and
William D. Goff
Wilson H. Faircloth*
Affiliation:
USDA/ARS National Peanut Research Lab, Dawson, GA 39842
Michael G. Patterson
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849
Wheeler G. Foshee
Affiliation:
Department of Horticulture, Auburn University, AL 36849
Monte L. Nesbitt
Affiliation:
Alabama Cooperative Extension System, Fairhope, AL 36532
William D. Goff
Affiliation:
Department of Horticulture, Auburn University, AL 36849
*
Corresponding author's E-mail: wilson.faircloth@ars.usda.gov
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Abstract

Six weed control programs with and without irrigation were investigated in a newly established pecan orchard. Irrigation increased crown diameter growth in only one of seven growing seasons but increased nut yield an average of 35% in the first two bearing years. Weed control program significantly influenced crown diameter beginning in the fourth growing season and continued through season six while also impacting final crown diameter. The use of postemergence (POST) herbicides increased crown diameter a minimum 4 mm vs. preemergence (PRE) herbicides. Mowing neither increased nor decreased crown diameter when used with herbicides; however, when used solely, crown diameter was 29% less. Highest growth rates were obtained with a combination PRE plus POST weed management system. Nut yields were closely linked to growth data. No differences in nut yield were observed between PRE- or POST-herbicide programs alone or in combination with mowing. Mowing alone decreased nut yield 57% vs. herbicide-based approaches. A combination PRE- plus POST-weed control program increased yield 38% vs. all other treatments.

Keywords

Pecan, Carya illinoinensis (Wang.) K. Koch var. ‘Desirable’Mowingdrip irrigation
Type
Research
Information
Weed Technology , Volume 21 , Issue 4 , December 2007 , pp. 972 - 976
Copyright
Copyright © Weed Science Society of America 

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