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Absorption, Translocation, and Toxicity of Foliar-Applied Imazaquin in Yellow and Purple Nutsedge (Cyperus esculentus and C. rotundus)

Published online by Cambridge University Press:  12 June 2017

Ujjanagouda B. Nandihalli  and
Leo E. Bendixen
Ujjanagouda B. Nandihalli
Affiliation:
Dep. Agron., Ohio State Univ., Columbus, OH 43210
Leo E. Bendixen
Affiliation:
Dep. Agron., Ohio State Univ., Columbus, OH 43210
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Abstract

Imazaquin {2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acid} absorption, translocation, and toxicity were investigated in yellow nutsedge (Cyperus esculentus L. # CYPES) and purple nutsedge (C. rotundus L. # CYPRO) after foliar treatment. Imazaquin rates from 0.125 to 0.375 kg ai/ha were sprayed on nutsedge plants at the four-leaf stage. Compared to untreated plants, these rates reduced the main shoot growth of yellow nutsedge by 70 to 86% and that of purple nutsedge by 80 to 92% at 28 days after application (DAA). However, the regrowth as measured by tiller production was significantly greater at 0.125 and 0.188 kg/ha rates than at higher rates. The plants treated with 0.313 and 0.375 rates had no rhizomes or tubers at the 28 DAA sampling. In yellow nutsedge, absorption of 14C-imazaquin increased from 36% at 1 DAA to 57% at 8 DAA. of the total absorbed 14C, 12% translocated from the treated area by 8 DAA. Roots and rhizomes accumulated equal amounts of radioactivity. In purple nutsedge, the absorption of imazaquin increased from 17% at 1 DAA to 53% at 8 DAA. Translocation of absorbed 14C in purple nutsedge at 8 DAA was 21%. Rhizomes accumulated significantly greater amounts of 14C than the roots.

Keywords

HerbiciderhizometillerCYPESCYPRO
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 36 , Issue 3 , May 1988 , pp. 313 - 317
Copyright
Copyright © 1988 by the Weed Science Society of America 

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