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Seedling Creeping Bentgrass (Agrostis stolonifera) Tolerance to Dithiopyr

Published online by Cambridge University Press:  12 June 2017

Darin S. Bevard  and
Thomas L. Watschke
Darin S. Bevard
Affiliation:
The Pennsylvania State University, University Park, PA 16802
Thomas L. Watschke*
Affiliation:
The Pennsylvania State University, University Park, PA 16802
*
Corresponding author's E-mail: [email protected].
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Abstract

Dithiopyr was applied to ‘Penneagle’ creeping bentgrass seedlings 2, 4, and 8 wk after emergence (WAE) in separate studies in the summers of 1992 and 1993 to determine seedling tolerance. Dithiopyr emulsifiable concentrate (IEC) was applied at 0.14, 0.28, 0.42, and 0.56 kg ai/ha, and granular (G) dithiopyr (0.1G) was applied at 0.14, 0.21, 0.28, and 0.42 kg/ha. Dithiopyr applied 2 WAE caused unacceptable injury regardless of rate or formulation. Injury was characterized by stunting of plants, leaf tip die-back, yellowing of older leaves, and a visible decline in quality. Injury increased with increasing rate. In 1992, the EC and G formulation of dithiopyr caused similar responses, whereas in the summer of 1993, the EC caused greater turf injury. Dithiopyr applied 4 WAE caused less injury than when applied 2 WAE, and injury was acceptable. Dithiopyr applied 8 WAE only slightly injured creeping bentgrass at the high rate for both formulations in both years.

Keywords

Dithiopyr, S,S-dimethyl 2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3,5-pyridinedicarbothioate, creeping bentgrass, Agrostis stolonifera HudsPreemergence herbicidesDCPAsiduronDigitaria ischaemumDIGISEC, emulsifiable concentrateG, granularWAE, weeks after emergenceWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 13 , Issue 2 , June 1999 , pp. 216 - 220
Copyright
Copyright © 1999 by the Weed Science Society of America 

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References

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