weed control in centipedegrass dr. tim r. murphy extension weed specialist university of georgia...
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WEED CONTROL IN CENTIPEDEGRASS
Dr. Tim R. Murphy
Extension Weed Specialist
University of Georgia
Griffin
SETHOXYDIM - VANTAGE - CENTIPEDEGRASS
CONTROLS ANNUAL GRASSES
SUPPRESSES BAHIAGRASS
NO ANNUAL BLUEGRASS CONTROL
NO SEDGE (NUTGRASS) CONTROL
VANTAGE - CENTIPEDEGRASS
NO COC NEEDED
ESTABLISHEDSEEDLING - 3 IN. STOLON GROWTH
DELAY MOWING 7 DAYS BEFORE AND AFTER APPLICATION
VANTAGEBAHIAGRASS SUPPRESSION
2.25 pts./acreDELAY MOWING - 7 DAYS BEFORE
AND AFTERREPEAT APPLICATION - 10 TO 14
DAYSACTIVELY-GROWING
TURFGRASS TOLERANCE TO HERBICIDES
HERBICIDE CENTIPEDEGRASS BERMUDAGRASS
ATRAZINE T D
BENTAZON T T
BENTAZON
+ ATRAZINE T S-I
MSMA/DSMA S T
SETHOXYDIM T S
TURFGRASS TOLERANCE TO HERBICIDES
HERBICIDE CENTIPEDEGRASS BERMUDAGRASS
IMAZAQUIN T T
HALOSULFURONT T
TRICLOPYR
+ CLOPYRALID T I
METRIBUZIN NR T
SETHOXYDIM T S
TOLERANCE TO CENTIPEDEGRASS TO ATRAZINE
ATRAZINE - 2.0 qts./acre QUALITY1
JAN + APR 6.8
APR + MAY 6.7
JAN + APR + MAY 6.7
APR + MAY + JULY 6.7
APR + JULY 6.6
MAY + JULY 7.0
MAY + JULY + AUG 7.0
JULY + AUG 6.9
NO HERBICIDE 6.41SEPTEMBER
TURFGRASS TOLERANCE TO HERBICIDES
HERBICIDE CENTIPEDEGRASS BERMUDAGRASS
2,4-D I-T T
MCPP T T
DICAMBA I-T T
2,4-D+MCPP
+DICAMBA S-I I-T
MCPP+2,4-D
+DICAMBA I-T T
Common Lespedeza Control with Atrazine
1-Mar 12-Apr 11-May 8-Jun0
10
20
30
40
50
60
70
80
90
100
1-Mar 12-Apr 11-May 8-Jun
% C
ontr
ol
Atrazine 2.0 qts./acre
TOLERANCE OF NEWLY-SPRIGGED CENTIPEDEGRASS TO ATRAZINE AND SIMAZINE
CENTIPEDEGRASSGROUND COVER (%)
HERBICIDE QTS./ACREWKS AFTERSPRIGGING 15 WAT 21 WAT
ATRAZINE 1.0 0 24 39
2.0 0 30 47
1.0 0,3 20 37
SIMAZINE 1.0 0 30 45
2.0 0 26 50
1.0 0,3 25 43
NONE --- --- 12 151JOHNSON, 1976
TOLERANCE OF CENTIPEDEGRASS TO POSTEMERGENCE HERBICIDES
HERBICIDE LBS. AI/ACREGROWTHSTAGE DATE
2,4-D 0.75 DORMANT MARCH 2
DICAMBA 0.5 50% GREEN MARCH 26
2,4-D+MCPP +DICAMBA
0.75+0.4+0.08 100% GREEN MAY 16
MCPP+2,4-D +DICAMBA
0.5+0.17+0.07
ATRAZINE 2.0
Tolerance of Dormant Centipedegrass
7WAT
8WAT
11WAT
12WAT
0
1
2
3
4
5
6
7
8
9
Qu
alit
y
7WAT
8WAT
11WAT
12WAT
Dicamba 0.5
2,4-D 0.75
Atrazine 2.0
No Herbicide
Tolerance of Centipedegrass at 50% Greenup
3 WAT 4 WAT 7 WAT 8 WAT0
1
2
3
4
5
6
7
8
9
Qu
alit
y
3 WAT 4 WAT 7 WAT 8 WAT
Dicamba 0.5
2,4-D 0.75
Atrazine 2.0
No Herbicide
Tolerance of Centipedegrass at 100% Greenup
1 WAT 2 WAT7.6
7.7
7.8
7.9
8
8.1
8.2
8.3
8.4
8.5
Qu
alit
y
1 WAT 2 WAT
Dicamba 0.5
2,4-D 0.75
Atrazine 2.0
No Herbicide
TOLERANCE OF DORMANT CENTIPEDEGRASS TO POSTEMERGENCE HERBICIDES -1987
QUALITY (0 to 10)WEEKS AFTER TREATMENT
HERBICIDE 7 8 11 122,4-D 5.7 7.5 8.3 8.2DICAMBA 5.3 7.7 8.3 8.12,4-D+MCPP+DICAMBA 5.8 7.8 8.3 8.3MCPP+2,4-D+DICAMBA 5.8 7.8 8.3 8.3ATRAZINE 5.9 7.7 8.2 8.1NO HERBICIDE 5.6 7.8 8.3 8.1LSD (0.05) NS NS NS NS
TOLERANCE OF CENTIPEDEGRASS AT 50% GREENUP TO POSTEMERGENCE HERBICIDES -
1987
QUALITY (0 to 10)WEEKS AFTER TREATMENT
HERBICIDE 3 4 7 82,4-D 6.0 7.5 7.6 7.9DICAMBA 5.7 7.3 8.4 8.12,4-D+MCPP+DICAMBA 6.0 7.7 7.9 8.0MCPP+2,4-D+DICAMBA 6.0 7.8 8.0 8.1ATRAZINE 5.9 8.0 8.2 8.1NO HERBICIDE 6.1 7.8 8.3 8.1LSD (0.05) NS NS NS NS
TOLERANCE OF CENTIPEDEGRASS AT 100% GREENUP TO POSTEMERGENCE HERBICIDES -
1987
QUALITY (0 to 10)WEEKS AFTER TREATMENT
HERBICIDE 1 22,4-D 7.9 8.5DICAMBA 7.9 8.52,4-D+MCPP+DICAMBA 8.1 8.5MCPP+2,4-D+DICAMBA 8.0 8.5ATRAZINE 8.0 8.5NO HERBICIDE 7.9 8.4LSD (0.05) NS NS
TOLERANCE OF CENTIPEDEGRASS TO 2,4-D AND 2,4-D + 2,4-DP
1 WAT 2 WAT 3 WAT 4 WAT 5 WAT0
5
10
15
20
25
1 WAT 2 WAT 3 WAT 4 WAT 5 WAT
2,4-D - 1 APP
2,4-D - 2 APP
2,4-D+2,4-DP - 1APP
2,4-D+2,4-DP - 2APP
NONE
2,4-D at 1.5 pts./acre2,4-D at 0.75, 2,4-DP at 0.75 lb/A
1979 - June + July1980 - July + Aug.
% I
nju
ry
TOLERANCE OF CENTIPEDEGRASS TO 2,4-D AND TRIMEC CLASSIC
1 WAT 2 WAT 3 WAT 4 WAT 5 WAT0
1
2
3
4
5
6
7
8
1 WAT 2 WAT 3 WAT 4 WAT 5 WAT
2,4-D - 1 APP
2,4-D - 2 APP
TRIMEC - 1 APP
TRIMEC - 2 APP
NONE
2,4-D at 1.5 pts./acreTrimec Classic at 3.25 pts./acre
1979 - June + July1980 - July + Aug.
% I
nju
ry