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Turf Safety to Dithiopyr of Newly Seeded Kentucky Bluegrass (Poa pratensis)

Published online by Cambridge University Press:  20 January 2017

Zachary J. Reicher ,
Daniel V. Weisenberger ,
Glenn A. Hardebeck  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
Glenn A. Hardebeck
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: [email protected].
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Abstract

Competition from large crabgrass is often responsible for the establishment failure of spring-seeded cool-season turfgrasses. The objective of this study was to determine how soon after seedling emergence dithiopyr could be applied without causing unacceptable damage to Kentucky bluegrass. Dithiopyr at 0.28 and 0.56 kg/ha was applied at various times prior to seeding and after emergence of Kentucky bluegrass in the field and greenhouse. Dithiopyr damaged Kentucky bluegrass seedlings in the greenhouse when applied earlier than 10 d after emergence (DAE) at 0.28 kg/ha and 14 DAE at 0.56 kg/ha. In the field study with heavy large crabgrass infestation, no significant phytotoxicity or long-term thinning occurred with any application of dithiopyr after emergence of Kentucky bluegrass. Dithiopyr applied as early as 3 DAE improved cover of Kentucky bluegrass by reducing competition from large crabgrass. When seeding is done early in spring before large crabgrass germination, dithiopyr could be applied at 0.28 kg/ha 10 DAE or at 0.56 kg/ha 14 DAE without risk of injury. Dithiopyr could be applied as early as 3 DAE on sites with heavy large crabgrass pressure or to late spring seedings when large crabgrass is germinating because the risk of turf thinning is warranted given the benefit of reduced large crabgrass competition for the desired turf.

Keywords

Dithiopyrlarge crabgrass, Digitaria sanguinalis (L.) Scop. #3 DIGSAKentucky bluegrass, Poa pratensis L. ‘America’, # POAPRPreemergence herbicidesDAE, days after emergencePOST, postemergencePRE, preemergenceWAE, weeks after emergence
Type
Research Article
Information
Weed Technology , Volume 14 , Issue 3 , September 2000 , pp. 550 - 555
Copyright
Copyright © Weed Science Society of America 

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