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Toxicity and Site of Uptake of Soil-Applied Imazaquin in Yellow and Purple Nutsedges (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} site of uptake and toxicity from soil application were investigated in yellow nutsedge (Cyperus esculentus L. #3 CYPES) and purple nutsedge (C. rotundus L. # CYPRO). Imazaquin concentrations of 0.1 to 0.5 ppmw inhibited yellow nutsedge shoot emergence completely, while purple nutsedge shoots emerged at the lower concentrations. Herbicide placement above the tuber reduced shoot emergence and shoot and root dry weights of both species more than did placement below the tuber. Increasing herbicide rate increased the number of tuber buds that sprouted. Three-day-old nutsedge propagules absorbed 14C-imazaquin from both rhizome shoots and roots and the herbicide moved both acropetally and basipetally in nutsedge propagules.

Keywords

Apical dominancesprouttuberCYPESCYPRO
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 36 , Issue 4 , July 1988 , pp. 411 - 416
Copyright
Copyright © 1988 by the Weed Science Society of America 

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