Research Report
Pylex Evaluation for Goosegrass Control and Bermudagrass Safety Virginia Tech Researchers: Jeffrey Derr, Ph.D., Professor of Weed Science, and Adam Nichols, Research Assistant, Hampton Roads AREC, Virginia Beach Research Sponsors: Virginia Turfgrass Council and Virginia Turfgrass Foundation Table 1. Injury to ‘Tifsport’ Bermudagrass Following Single and Repeat Herbicide Applications. z
Trt. No. 1
Treatment Name Nontreated
2
Pylex + MSO
3
Pylex + MSO
4
Pylex + MSO
5
Pylex + MSO
6
Pylex + MSO
7
Pylex + MSO
8 Revolver 9 Acclaim Extra LSD (P = 0.05)
Rate
Application v Timing
4 DATA
Turfgrass Injury (1-9: 1= No Injury, and 4 = Unacceptable injury) 19 DATA 29 DATA 36 DATA 42 DATA 7 DATA 13 DATA w 6 DATC 16 DATC 23 DATC 29 DATC 1.0 d 1.0 d 1.0 e 1.0 f 1.0 f 1.0 f
x
v
1.0 d 0.5 fl. oz./a 0.5 % v/v 0.75 fl. oz./a 0.5 % v/v 1 fl. oz./a 0.5 % v/v 0.5 fl. oz./a 0.5 % v/v 0.75 fl. oz./a 0.5 % v/v 1 fl. oz./a 0.5 % v/v 26 fl. oz./a 28 fl. oz./a
50 DATA 37 DATC 1.0 e
AB
1.4 c
3.1 c
5.3 c
8.3 a
5.0 d
3.0 e
1.8 e
1.0 e
AB
2.0 b
4.0 b
6.0 b
8.3 a
5.8 cd
3.9 d
1.9 e
1.0 e
A
2.9 a
4.8 a
7.3 a
7.5 b
3.9 e
1.4 f
1.0 f
1.0 e
CD
1.0 d
1.0 d
1.0 d
3.5 c
7.0 b
7.6 b
7.0 c
3.1 c
CD
1.0 d
1.0 d
1.0 d
3.0 c
7.6 b
8.5 a
7.6 b
4.3 b
CD
1.0 d
1.0 d
1.0 d
3.5 c
8.5 a
6.4 c
3.0 d
1.5 d
CD CD
1.0 d 1.0 d 0.2
1.0 d 1.0 d 0.2
1.0 d 1.0 d 0.5
1.0 e 2.0 d 0.7
1.0 f 6.1 c 0.8
1.0 f 7.5 b 0.6
1.0 f 8.3 a 0.4
1.0 e 5.0 a 0.3
zTurfgrass injury rated on a 1-9 scale where 1 = no injury, 4 = unacceptable injury, and 9 = complete death. yLetters correspond to the timing and growth stage in the Our Research section. xDATA = Days after treatment A = May 30, 2013. wDATC = Days after treatment C = June 12, 2013. vMeans are the average of four replicates. Means followed by the same letter do not differ significantly according to the Least Significant Difference test (a = 0.05)
Table 2. Goosegrass Control Following Singe and Repat Herbicide Applications. Trt. No. 1
Treatment Name Nontreated
2
Pylex + MSO
3
Pylex + MSO
4
Pylex + MSO
5
Pylex + MSO
6
Pylex + MSO
7
Pylex + MSO
8 Revolver 9 Acclaim Extra LSD (P = 0.05)
Rate
Application z Timing
7 DATA
13 DATA
Goosegrass Control (%) 19 DATA 29 DATA 36 DATA x 6 DATC 16 DATC 23 DATC 0d 0d 3d
42 DATA 29 DATC 1d
50 DATA 37 DATC 1c
v
0b
AB
38 b
88 a
99 a
89 ab
99 a
100 a
98 a
AB
41 b
85 a
95 a
95 a
100 a
90 bc
58 b
A
60 a
86 a
24 bcd
0d
0d
0d
0c
CD
0c
0b
51 b
58 c
90 ab
99 a
100 a
CD
0c
0b
49 b
67 bc
95 ab
100 a
100 a
CD
0c
0b
50 b
68 bc
96 ab
100 a
100 a
CD CD
0c 0c 5
0b 0b 7
18 cd 35 bc 29
68 bc 55 c 24
85 b 48 c 12
96 ab 88 c 6
99 a 91 a 24
0c 0.5 fl. oz./a 0.5 % v/v 0.75 fl. oz./a 0.5 % v/v 1 fl. oz./a 0.5 % v/v 0.5 fl. oz./a 0.5 % v/v 0.75 fl. oz./a 0.5 % v/v 1 fl. oz./a 0.5 % v/v 26 fl. oz./a 28 fl. oz./a
y
zLetters correspond to the timing and growth stage in the Our Research section. yDATA = Days after treatment A = May 30, 2013. xDATC = Days after treatment C = June 12, 2013. w Means are the average of four replicates. Means followed by the same letter do not differ significantly according to the Least Significant Difference test (a = 0.05)