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Turf Safety and Effectiveness of Dithiopyr and Quinclorac for Large Crabgrass (Digitaria sanguinalis) Control in Spring-Seeded Turf

Published online by Cambridge University Press:  12 June 2017

Zachary J. Reicher ,
Daniel V. Weisenberger  and
Clark S. Throssell
Zachary J. Reicher*
Affiliation:
Purdue University, Department of Agronomy, 1150 Lilly Hall, West Lafayette, IN 47907-1150
Daniel V. Weisenberger
Affiliation:
Purdue University, Department of Agronomy, 1150 Lilly Hall, West Lafayette, IN 47907-1150
Clark S. Throssell
Affiliation:
Purdue University, Department of Agronomy, 1150 Lilly Hall, West Lafayette, IN 47907-1150
*
Corresponding author's E-mail: zreicher@dpt.agry.purdue.edu.
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Abstract

There are limited options for controlling large crabgrass in spring-seeded cool-season turf. The objective of this experiment was to evaluate the safety and effectiveness of dithiopyr and quinclorac to control large crabgrass in spring-seeded Kentucky bluegrass and perennial ryegrass stands. Quinclorac at 0.84 kg/ha and dithiopyr at 0.56 kg/ha were applied separately at various times prior to seeding and after emergence of Kentucky bluegrass and perennial ryegrass. Quinclorac applied once at 2, 4, 8, or 12 weeks after emergence (WAE) or split-applied preplant incorporated (PPI) + 12 WAE will give season-long control of large crabgrass with no injury to spring-seeded Kentucky bluegrass or perennial ryegrass. Quinclorac applied PPI or 0 WAE is safe to use in spring seedings, but it will not provide season-long control of large crabgrass. Dithiopyr applied 2 or 4 WAE will control large crabgrass season-long while not injuring spring-seeded Kentucky bluegrass or perennial ryegrass. However, dithiopyr applied PPI or 0 WAE will severely limit germination of desirable turf, and dithiopyr applied 8 or 12 WAE will not control mature crabgrass.

Keywords

Dithiopyr, S,S-dimethyl 2-(difluoromethyl)-4-(2-methylpropyl)-6-(triflouromethyl)-3,5-pyridinedicar bothioatequinclorac, 3,7-dichloro-8-quinolinecarboxylic acidlarge crabgrass, Digitaria sanguinalis (L.) Scop. #DIGSAKentucky bluegrass, Poa pratensis L. ‘America’ # POAPRperennial ryegrass, Lolium perenne L. ‘Fiesta II’ # LOLPEPOST, postemergencePPI, preplant incorporatedPRE, preemergenceWAE, weeks after emergence
Type
Research
Information
Weed Technology , Volume 13 , Issue 2 , June 1999 , pp. 253 - 256
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

1

Contribution from the Purdue University Agricultural Experiment Station Journal Paper 15741.

References

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