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Effect of Soil Moisture on Efficacy of Imazethapyr in Greenhouse

Published online by Cambridge University Press:  20 January 2017

Wei Zhang ,
Eric P. Webster  and
H. Magdi Selim
Wei Zhang
Affiliation:
Department of Plant Pathology and Crop Physiology, 302 Life Sciences Building, Louisiana State University Agricultural Center, Baton Rouge, LA 70803
Eric P. Webster*
Affiliation:
Department of Plant Pathology and Crop Physiology, 302 Life Sciences Building, Louisiana State University Agricultural Center, Baton Rouge, LA 70803
H. Magdi Selim
Affiliation:
Department of Agronomy, 104 Sturgis Hall, Louisiana State University Agricultural Center, LA 70803
*
Corresponding author's E-mail: ewebster@agctr.lsu.edu.
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Abstract

A greenhouse study was conducted to evaluate the efficacy of imazethapyr at 35 and 53 g ai/ha applied preplant incorporated (PPI) or postemergence (POST) under various soil moisture regimes (13, 19, 25, and 50%) on barnyardgrass and red rice. Response of barnyardgrass and red rice to imazethapyr PPI was affected by soil moisture. With imazethapyr PPI, control of barnyardgrass was reduced at 50% soil moisture compared with other soil moisture regimes, and height of barnyardgrass increased as soil moisture increased from 19 to 50% 2 weeks after treatment (WAT). Barnyardgrass control declined and plant dry weight increased with the increase of soil moisture from 19 to 50% at 3 WAT. Imazethapyr PPI activity on red rice was reduced at 50% compared with other soil moisture regimes, as reflected by decreased control ratings as well as increased plant height and dry weight. Imazethapyr activity on barnyardgrass and red rice was increased at 50% soil moisture when applied POST compared with PPI. Imazethapyr POST activity on barnyardgrass and red rice was generally not affected by the soil moisture regimes or application rates. The results suggested that high soil moisture conditions reduced imazethapyr PPI efficacy on barnyardgrass and red rice. Imazethapyr POST activity seems unaffected by soil moisture conditions and thus may be used to control barnyardgrass and red rice if wet soil conditions are a concern.

Keywords

Imazethapyrbarnyardgrass, Echinochloa crus-galli (L.) Beauv. #3 ECHCGred rice, Oryza sativa L. # ORYSASesbania exaltata (Raf.) Rydb. Ex A. W. Hill # SEBEXImidazolinone herbicidesricePOST, postemergencePPI, preplant incorporatedWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 15 , Issue 2 , June 2001 , pp. 355 - 359
Copyright
Copyright © Weed Science Society of America 

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