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Weed control and Zea mays tolerance as affected by timing of RP-201772 application

Published online by Cambridge University Press:  12 June 2017

Christy L. Sprague ,
Donald Penner  and
James J. Kells
Christy L. Sprague
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824-1325
James J. Kells
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824-1325
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Abstract

Field studies were conducted in 1996 and 1997 to determine the effects of RP-201772 and RP-201772 tank mixtures applied to emerged Zea mays. RP-201772 at 105 g ha−1 and tank-mixed metolachlor/benoxacor or atrazine were applied preemergence and to spike, 2-leaf, and 4-leaf Z. mays. Herbicide treatments over the four application timings provided greater than 90% Chenopodium album, Ambrosia artemisiifolia, Amaranthus retroflexus, and Abutilon theophrasti control. However, Setaria faberi control varied among years and application timings. Severe Z. mays injury, 70% and 40%, was observed when RP-201772 tank-mixed with metolachlor/benoxacor was applied to 2-leaf and 4-leaf Z. mays, respectively. Greenhouse studies confirmed Z. mays sensitivity from delayed applications of RP-201772 tank-mixed with metolachlor/benoxacor. Similarly, increased Z. mays injury was observed from postemergence applications of RP-201772 tank-mixed with acetochlor/MON-13900. Herbicide absorption, translocation, metabolism, and retention studies were conducted to determine the physiological basis for the observed Z. mays injury from delayed applications of the RP-201772 tank mixture with metolachlor/benoxacor. Metolachlor/benoxacor increased radiolabeled RP-201772 absorption when applied to spike, 2-leaf, and 4-leaf Z. mays. RP-201772 translocation and metabolism did not explain enhanced Z. mays injury. However, RP-201772 retention increased fivefold when metolachlor/benoxacor was present in the spray solution and applied to 2-leaf and 4-leaf Z. mays. Increased RP-201772 absorption and retention appeared to be the basis for Z. mays injury when tank-mixed with metolachlor/benoxacor and applied to emerged Z. mays.

Keywords

Acetochloratrazinebenoxacor = CGA-154281, (4-dichloroacetyl)-3,4-dihydro-3-methyl-2H-1,4-benzoxazineisoxaflutole = RP-201772, 5-cyclopropyl isoxazol-4-yl-2-mesyl-4-trifluoromethylphenyl ketonemetolachlorMON-13900, (±)-3-dichloroacetyl-5-(2-furanyl)-2,2-dimethyl oxazolidineAbutilon theophrasti Medicus ABUTH, velvetleafAmaranthus retroflexus L. AMARE, redroot pigweedAmbrosia artemisiifolia L. AMBEL, common ragweedChenopodium album L. CHEAL, common lambsquartersSetaria faberi Herrm. SETFA, giant foxtailZea mays L., cornDelayed preemergenceabsorptiontranslocationmetabolismspray retentionABUTHAMAREAMBELCHEALSETFA
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 47 , Issue 4 , August 1999 , pp. 375 - 382
Copyright
Copyright © 1999 by the Weed Science Society of America 

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