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Effect of Dithiopyr Timing on Establishment of Three Cool-Season Turfgrass Species

Published online by Cambridge University Press:  12 June 2017

B. Jack Johnson  and
Sarah H. Bundschuh
B. Jack Johnson
Affiliation:
Univ. Ga., Georgia Stn., Griffin, GA 30223-1797
Sarah H. Bundschuh
Affiliation:
Monsanto Co., Atlanta, GA. Contribution from the Georgia Agric. Exp. Stn.
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Abstract

An experiment was conducted to determine the interval needed between dithiopyr formulation (EC and G) treatments and seeding of tall fescue, perennial ryegrass, and creeping bentgrass. The cover of tall fescue 10 wk after seeding was not reduced when the EC formulation was applied at ≤ 0.84 kg ha−1 ≥ 2 wk before seeding. Dithiopyr G at 0.56 kg ha−1 did not reduce tall fescue cover when applied at ≥ 8 wk before seeding; whereas, 0.84 kg ha−1 required a 12-wk interval between treatment and seeding in one of two years. Perennial ryegrass cover 10 wk after seeding was not reduced with dithiopyr at 0.56 kg ha−1 applied from 2 to 12 wk before seeding. When the dithiopyr G was applied at 0.56 kg ha−1, an 8-wk interval before seeding was needed to prevent a reduction in turf cover. When rates of EC and G dithiopyr were increased to 0.84 kg ha−1 an 8-wk interval was needed for the EC and a 12-wk interval was needed for the G formulation to prevent a reduction in cover in one of two years. Creeping bentgrass cover was not reduced when dithiopyr EC was applied at 0.56 kg ha−1 ≥ 8 wk before seeding. When the EC rate was increased to 0.84 kg ha−1 a 12-wk interval was needed between treatment and seeding in one of two years. When dithiopyr G was applied within 12 wk of seeding creeping bentgrass, the cover was reduced to an unacceptable level regardless of application rate.

Keywords

Dithiopyr, S,S-dimethyl-2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3,5-pyridinedicarbothioatecreeping bentgrass, Agrostis stolonifera L. ‘Penncross' # AGSSTperennial ryegrass, Lolium perenne L. 50% ‘Palmer’ and 50% ‘Prelude’ # LOLPEtall fescue, Festuca arundinacea Schreb. ‘Rebel II’ # FESARTreatment datesturf covercreeping bentgrassperennial ryegrasstall fescueAGSSTLOLPEFESAR
Type
Research
Information
Weed Technology , Volume 7 , Issue 1 , March 1993 , pp. 169 - 173
Copyright
Copyright © 1993 by the Weed Science Society of America 

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References

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