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Exudation of Mesotrione from Potato Roots Injures Neighboring Plants

Published online by Cambridge University Press:  20 January 2017

Rick A. Boydston  and
Kassim Al-Khatib
Rick A. Boydston*
Affiliation:
Irrigated Agriculture Research and Extension Center, Agricultural Research Service, U.S. Department of Agriculture, Prosser, WA, 99350-9687
Kassim Al-Khatib
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS, 66506
*
Corresponding author's E-mail: rick.boydston@ars.usda.gov
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Abstract

Mesotrione is an effective herbicide for volunteer potato control but is not selective in several crops, including onion and carrot. Studies were conducted in 2006 to evaluate the effectiveness of wiper-applied mesotrione for control of volunteer potato in a potato crop. Surprisingly, nontreated potatoes growing adjacent to mesotrione-treated plants exhibited bleaching symptoms resembling mesotrione injury. Additional field trials confirmed injury to nontreated plants growing within 26 cm of potatoes treated with mesotrione applied with a wiper at 0.25, 0.5, and 1% (v/v) solutions. Greenhouse bioassays confirmed that mesotrione applied to potato leaves moved down through the plant and was exuded into perlite potting medium in sufficient quantities to injure potato plants that were exposed to the leachate from the perlite pots. In tracer studies, 52% of 14C-labeled mesotrione applied to potato leaves was absorbed into the potato plant by 15 d and 15% of the absorbed 14C-mesotrione was exuded into the soil and soil leachate. Mesotrione applied to potato by the wick application method has potential to injure neighboring susceptible plants from root uptake of exuded mesotrione.

Keywords

Mesotrionecarrot, Daucus carota L.onion, Allium cepa L.potato, Solanum tuberosum L.Excretionherbicideroot exudateroot exudation
Type
Weed Management
Information
Weed Science , Volume 56 , Issue 6 , December 2008 , pp. 852 - 855
Copyright
Copyright © Weed Science Society of America 

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