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Response of Tall Fescue (Festuca arundinacea) to Plant Growth Regulator Application Dates

Published online by Cambridge University Press:  12 June 2017

Billy J. Johnson
Billy J. Johnson*
Affiliation:
Dep. Agron., Univ. Ga., Ga. Stn., Griffin, GA 30223-1797
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Abstract

Mon 4620 at 2.8 kg ai/ha, paclobutrazol plus mefluidide at 1.1 plus 0.4 kg ai/ha, and flurprimidol plus mefluidide at 1.1 plus 0.4 kg ai/ha were applied on four dates to determine their influence on highly maintained tall fescue turf. Seedhead suppression was good to excellent by Mon 4620 applied March 1 or 18 and by paclobutrazol plus mefluidide and flurprimidol plus mefluidide applied anytime from March 1 until April 1. None of the plant growth regulators (PGRs) suppressed seedheads effectively when applied April 15 when the grass was near the end of the rapid growth cycle and just before seedhead emergence. Vegetative growth of mowed tall fescue was suppressed for 8 weeks in 1987 when PGRs were applied March 1 immediately after full green-up. Application dates were not as important in 1988 as in 1987. Tall fescue was injured the least by Mon 4620 applied in March and by flurprimidol plus mefluidide applied on March 18. Paclobutrazol plus mefluidide injured the turf severely regardless of application date.

Keywords

Flurprimidol, α-(1-methylethyl)-α-[4-(trifluoromethoxy)phenyl]-5-pyrimidinemethanolmefluidide, N-[2,4-dimethyl-5-[[(trifluoromethyl)sulfonyl] amino] phenyl] acetamideMon 4620, N-[(acetylamino)-methyl]-2-chloro-N-2,6-(diethylphenyl)acetamidepaclobutrazol(±)-(R*,R*) β-[(4-chlorophenyl)methyl] -α-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanoltall fescue, Festuca arundinacea Schreb. ‘Ky 31’ #3 FESARSeedhead controlvegetative suppressionflurprimidolmefluidideMon 4620paclobutrazolFESAR
Type
Research
Information
Weed Technology , Volume 3 , Issue 2 , June 1989 , pp. 408 - 413
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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