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Imazamethabenz Persistence in a Wheat (Triticum aestivum)–Potato (Solanum tuberosum) Rotation

Published online by Cambridge University Press:  20 January 2017

Jin H. Joo ,
Charlotte V. Eberlein ,
Matthew J. Morra  and
Mary J. Guttieri
Jin H. Joo
Affiliation:
Department of Plant, Soil, and Entomological Sciences, University of Idaho, Aberdeen, ID 83210
Charlotte V. Eberlein*
Affiliation:
Twin Falls Research and Extension Center, University of Idaho, Twin Falls, ID 83303
Matthew J. Morra
Affiliation:
Department of Plant, Soils, and Entomological Sciences, University of Idaho, Moscow, ID 83844-2339
Mary J. Guttieri
Affiliation:
Department of Plant, Soil, and Entomological Sciences, University of Idaho, Aberdeen, ID 83210
*
Corresponding author's E-mail: ceberl@uidaho.edu.
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Abstract

Potato crops often are grown in rotation with cereal crops such as wheat and barley. Imazamethabenz is a postemergence herbicide that selectively controls wild oat and certain other weeds in wheat and barley. Experiments were conducted at the University of Idaho Research and Extension Center, Aberdeen, ID, over a 3-yr period to evaluate the effect of irrigation management in an imazamethabenz-treated wheat crop on imazamethabenz persistence and injury in a subsequent potato crop. The experimental design was a split plot arrangement of a randomized complete block; main plots were seasonal irrigation amounts in wheat (20, 30, 40, or 50 cm), and subplots were imazamethabenz rates applied to the wheat crop (0, 0.26, 0.52, or 1.05 kg/ha). Soil analyses for imazamethabenz residues showed that herbicide degradation during the wheat growing season (i.e., 0 to 128 d after treatment [DAT]) followed first-order kinetics at all irrigation levels. Herbicide degradation rate increased with irrigation rate. Soil samples taken 338 or 351 DAT showed no detectable imazamethabenz residues (<10 ng/g) in most plots. However, some foliar injury to potato grown the year following imazamethabenz treatment was noted (<10% average injury), suggesting that potato is sensitive to imazamethabenz or imazamethabenz acid residues below the analytical detection limit. U.S. No. 1 and total potato tuber yield were not reduced by any treatment compared to the nontreated control. Therefore, under good growing conditions, potato can recover from mild imazamethabenz carryover injury without effects on tuber yield or quality.

Keywords

Imazamethabenz-methylwild oat, Avena fatua L.barley, Hordeum vulgare L.potato, Solanum tuberosum L.wheat, Triticum aestivum L.Irrigation managementcarryoverDAT, days after imazamethabenz treatmentOC, organic carbonOM, organic matterPOST, postemergencePRE, preemergence
Type
Research
Information
Weed Technology , Volume 15 , Issue 2 , June 2001 , pp. 208 - 215
Copyright
Copyright © Weed Science Society of America 

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