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Sequential Applications of Preemergence and Postemergence Herbicides for Large Crabgrass (Digitaria sanguinalis) Control in Tall Fescue (Festuca arundinacea) Turf

Published online by Cambridge University Press:  12 June 2017

B. Jack Johnson
B. Jack Johnson*
Affiliation:
Crop and Soil Sciences, University of Georgia, Georgia Agricultural Experiment Station, Griffin, GA 30223-1797
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Abstract

Preemergence (PRE) and postemergence (POST) herbicides were sequentially applied to tall fescue over a 2-yr period to determine the lowest herbicide rates needed for acceptable large crabgrass control. Prodiamine was the only PRE herbicide that provided full-season large crabgrass control in tall fescue turf. The control was 85% in plots treated at one-third recommended rate (0.3 kg/ha) and 96% at the full rate (0.8 kg/ha). Sequential applications of oxadiazon at one-third recommended rate (1.1 kg/ha) in late February followed by fenoxaprop (0.2 kg/ha) in June controlled 85% large crabgrass in late August. Control was similar in mid-August when pendimethalin, dithiopyr, or oryzalin at one-third recommended rates was followed by fenoxaprop, but was not acceptable (≤ 74%) by late August. In most instances, large crabgrass control was higher when fenoxaprop followed the PRE herbicide application than with MSMA. Reduced herbicide rates may not provide full-season large crabgrass control in other areas with different soil and weather conditions. Tall fescue quality was not affected by prodiamine, dithiopyr, and oxadiazon. In 1996, pendimethalin at 3.3 kg/ha reduced turf quality 16% and oryzalin at 2.2 kg/ha reduced quality by 46%. In 1995, MSMA reduced the quality of tall fescue more (≤ 21%) than fenoxaprop (≤ 10%). When compared to the use of PRE and POST herbicides alone, sequential PRE plus POST herbicide programs did not affect turfgrass quality.

Keywords

Dithiopyr, S-S-dimethyl 2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3,5-pyridinedicarbothioatefenoxaprop, (±)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy] propanoic acidMSMA, monosodium salt of methylarsonic acidoryzalin, 4-(dipropylamino)-3,5-dinitrobenzenesulfonamideoxadiazon, 3-[2,4-dichloro-5-(1-methylethoxy)phenyl]-5-(1,1-dimethylethyl)-1,3,4-oxadiazol-2-(3H)-onependimethalin, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamineprodiamine, 2,4-dinitro-N3N3-dipropyl-6-(trifluoromethyl)-1,3-benzenediaminelarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSAtall fescue, Festuca arundinacea Schreb. # FESARHerbicide programturfgrass toleranceweed control programDIGSAFESARPOST, postemergencePRE, preemergence
Type
Research
Information
Weed Technology , Volume 11 , Issue 4 , December 1997 , pp. 693 - 697
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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