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Confirmation and Control of a Paraquat-Tolerant Goosegrass (Eleusine indica) Biotype

Published online by Cambridge University Press:  20 January 2017

Richard S. Buker III ,
Shawn T. Steed  and
William M. Stall
Richard S. Buker III
Affiliation:
Horticultural Sciences Department, University of Florida, Gainesville, FL 32611
Shawn T. Steed
Affiliation:
Horticultural Sciences Department, University of Florida, Gainesville, FL 32611
William M. Stall*
Affiliation:
Horticultural Sciences Department, University of Florida, Gainesville, FL 32611
*
Corresponding author's E-mail: wms@mail.ifas.ufl.edu.
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Abstract

Diminished control of goosegrass was observed in tomato fields located in Manatee County, FL, after years of repeated paraquat use. Tolerance of the Manatee biotype to paraquat was confirmed by its comparison in greenhouse studies with a susceptible biotype from the Alachua County, FL. A 30-fold increase in paraquat rate was required to reach the 50% growth reduction level of the resistant biotype over the susceptible biotype. The Manatee biotype was not tolerant to clethodim, metribuzin, or sethoxydim. These herbicides provided adequate control of all the goosegrass biotypes tested.

Keywords

Clethodimmetribuzinparaquatsethoxydimgoosegrass, Eleusine indica L. #3 ELEINtomato, Lycopersicou esculentum MillAdditiveantagonismherbicide resistancesynergismGR50, herbicide concentration required to inhibit goosegrass aboveground biomass by 50%WAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 16 , Issue 2 , June 2002 , pp. 309 - 313
Copyright
Copyright © Weed Science Society of America 

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