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Cloransulam absorption, translocation, and efficacy on common broadleaf weed species

Published online by Cambridge University Press:  20 January 2017

Jeff W. Barnes  and
Lawrence R. Oliver
Lawrence R. Oliver
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701
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Abstract

Field and laboratory studies were conducted to evaluate herbicide efficacy, absorption, and translocation of cloransulam within broadleaf weeds. Control of morningglory species and velvetleaf with cloransulam was dependent upon application rate and timing. A reduced rate of cloransulam (9 g ai ha−1) was as effective as the labeled rate (18 g ha−1), when applications were targeted to small to midsize morningglory and velvetleaf. Prickly sida, hemp sesbania, and sicklepod were suppressed by cloransulam. Contour maps predicted accurately weed control for all species except tall morningglory. Cloransulam absorption and translocation provided some information about tolerance mechanisms. Susceptible species, entireleaf morningglory and velvetleaf, both rapidly absorbed 14C-cloransulam. Absorption in the more tolerant velvetleaf was 20% lower than entireleaf morningglory at all harvest times. Absorption of 14C-cloransulam in prickly sida was only 26% 6 h after treatment, and absorption did not increase with time. Differences in cloransulam absorption and translocation partially explained differences in susceptibility among some weed species but not others.

Keywords

Cloransulamentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray IPOHGhemp sesbania, Sesbania exaltata (Raf) Rydb. ex A. W. Hill SEBEXprickly sida, Sida spinosa L. SIDSPtall morningglory, Ipomoea purpurea (L.) Roth PHBPUsicklepod, Senna obtusifolia L. CASOBvelvetleaf, Abutilon theophrasti Medicus ABUTHContour plotsapplication timingherbicide efficacyreduced rates
Type
Weed Management
Information
Weed Science , Volume 52 , Issue 4 , August 2004 , pp. 634 - 641
Copyright
Copyright © Weed Science Society of America 

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