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Important Considerations for RPA 201772 Utility

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
Donald Penner*
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
*
Corresponding author's E-mail: [email protected].
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Abstract

Greenhouse and laboratory studies were conducted to examine certain characteristics of RPA 201772 and how they may affect its utility. 14C-RPA 201772 was used to determine the stability of RPA 201772 in various pH spray solutions over time. After 24 h, degradation of RPA 201772 was 20, 36, and 93% in spray solutions adjusted to pH 4.0, 7.0, and 10.0, respectively. The major metabolite was diketonitrile (DKN), which is herbicidally active. In addition, 9 and 15% of the RPA 201772 had degraded into an inactive benzoic acid derivative at pH 7.0 and 10.0, respectively. The differences in herbicidal activity of RPA 201772 and its metabolite DKN were also evaluated. Corn seeds and velvetleaf seeds readily imbibed RPA 201772, but only low levels of DKN were imbibed. Preemergence (applications of RPA 201772 and DKN were equally active on corn and velvetleaf. Further studies determined that the principal sites of uptake of RPA 201772 by corn was roots and seeds for four different corn hybrids. Another study determined that light was required for RPA 201772 activity. Corn shoots from seeds germinated under 14 h of light exhibited rate-dependent injury, while corn germinated and grown in the darkness was not injured.

Keywords

Benzoic acid derivative, 2-mesyl-4-trifluoromethylphenyl benzoic aciddiketonitrile, 2-cyclopropyl-3-(2-mesyl-4-trifluoromethylphenyl)-3-oxopropanenitrileRPA 201772 (proposed common name, isoxaflutole), 5-cyclopropyl isoxazol-4-yl-2-mesyl-4-trifluoromethylphenyl ketonevelvetleaf, Abutilon theophrasti Medicus ♯ ABUTHcorn, Zea mays L.Isoxaflutolelight requirementseed imbibitionsite of uptakespray solutionDAT, days after treatmentDKN, diketonitrileHPPD, 4-hydroxyphenylpyruvate dioxygenaseProtox, protoporphyrinogen oxidasePS I, photosystem IPS II, photosystem IITLC, thin-layer chromatography
Type
Research
Information
Weed Technology , Volume 13 , Issue 4 , December 1999 , pp. 814 - 820
Copyright
Copyright © 1999 by the Weed Science Society of America 

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