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Influence of Diclofop and Dithiopyr on Spring Transition of a Bermudagrass (Cynodon dactylon) Green Overseeeded with Perennial Ryegrass (Lolium perenne)

Published online by Cambridge University Press:  12 June 2017

B. Jack Johnson
B. Jack Johnson*
Affiliation:
Crop and Soil Sci., Univ. of Georgia, Georgia Stn., Griffin, GA 30223-1797
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Abstract

Diclofop and dithiopyr were applied in April and early May during 1992 and 1993, to a ‘Tifway’ bermudagrass golf green overseeded with perennial ryegrass, to determine the effects of rates and dates on perennial ryegrass injury and on transition from a mixed cool- and warm-season grass to bermudagrass turf. Diclofop applied as a single application at 0.6 kg/ha or two applications at 0.3 kg/ha during April and/or early May gradually reduced perennial ryegrass during June and July when compared with untreated turf. During this period, both grasses treated with diclofop maintained 94% or greater cover. However, perennial ryegrass was moderately to severely injured from the treatments. Maximum injury from the 0.6 kg/ha rate ranged from 40 to 55% during 1992 and 29 to 33% during 1993. The injury was pronounced over a period of one to three weeks. Maximum injury from 0.3 kg/ha applied on April 3 and repeated at the same rate on April 17 was 28% in 1992 and 37% in 1993. Perennial ryegrass injury from split applications was lower than from the single 0.6 kg/ha rate in 1992. The optimum time and rate for effective spring transition with least amount of perennial ryegrass injury was 0.3 kg/ha applied on April 5 and repeated at the same rate on April 17. Dithiopyr did not affect the spring transition of overseeded perennial ryegrass to bermudagrass, regardless of rate and application date.

Keywords

Diclofop, (±)-2[4-(2,4-dichlorophenoxy)phenoxy]propanoic aciddithiopyr, S,S-dimethyl-2(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3,5-pyridinedicarbothioate‘Tifway’ bermudagrass, Cynodon transvaalensis Burtt-Davey # CYNTR × C. dactylon (L.) Pers. # CYNDAperennial ryegrass, Lolium perenne L. 32.9% ‘Palmer,’ 32.8% ‘Prelude,’ and 32.8% ‘Yorktown II’ # LOLPE.
Type
Research
Information
Weed Technology , Volume 8 , Issue 2 , June 1994 , pp. 207 - 211
Copyright
Copyright © 1994 by the Weed Science Society of America 

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References

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