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Control of Annual Bluegrass (Poa annua) in Kentucky Bluegrass (Poa pratensis) Turf with Linuron

Published online by Cambridge University Press:  12 June 2017

J. Christopher Hall  and
C. Ken Carey
J. Christopher Hall
Affiliation:
Dep. Environ. Biol., Univ. Guelph, Guelph, Ont. N1G 2W1, Canada
C. Ken Carey
Affiliation:
Dep. Hortic. Sci., Univ. Guelph, Guelph, Ont. N1G 2W1, Canada
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Abstract

Effects of linuron on annual bluegrass control and Kentucky bluegrass cultivar tolerance were studied in field and growth chamber experiments. In controlled environment experiments, linuron at 0.06, 0.12, 0.25, 0.50, and 0.75 kg ai ha-1 was applied to pure stands of annual bluegrass and eight Kentucky bluegrass cultivars. Linuron at the two highest rates controlled annual bluegrass, reducing the clipping dry weight by more than 85% 4 wk after treatment, and by 65 to 92% 6 wk after treatment. Growth of Kentucky bluegrass was reduced with the most severe reduction occurring 2 wk after linuron application. All cultivars exhibited normal growth 8 wk after treatment. In field experiments, linuron at rates from 1.5 to 2.0 kg ai ha-1 controlled annual bluegrass in old (> 5 yr) Kentucky bluegrass stands, and in 16 cultivars of 1-yr and 2-yr-old Kentucky bluegrass stands, with little or no damage. At rates of 1.5, 2.0, and 2.5 kg ai ha-1 linuron, damage to newly seeded cultivars was moderate to severe. However, 6 to 7 wk after linuron application to newly seeded cultivars, stand density and turf quality were equivalent to untreated checks.

Keywords

Linuron, N′-(3,4-dichlorophenyl)-N-methoxy-N-methylureaannual bluegrass, Poa annua L. # POAANKentucky bluegrass, Poa pratensis L. # POAPRPostemergence controllinuronPOAANPOAPR
Type
Research
Information
Weed Technology , Volume 6 , Issue 4 , December 1992 , pp. 852 - 857
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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