Research Report
Pylex and Pylex plus Turflon Ester for Goosegrass Control in Bermudagrass Virginia Tech Researchers: Jeffrey Derr, Ph.D., Professor of Weed Science, and Adam Nichols, Research Assistant, Hampton Roads Ag. Research and Extension Center, Virginia Beach Research Sponsors: BASF, The Virginia Turfgrass Council and The Virginia Turfgrass Foundation Table 1. Bermudagrass tolerance to the applied treatments. Bermudagrass Tolerance (1–9 scale) (1 = no injury, 4 = unacceptable injury, 9 = complete death)
3 DAT 10 DAT 16 DAT 22 DAT 30 DAT 38 DAT 45 DAT 7/13/14 3 DAT (2) 9 DAT (2) 6 DAT (3) 8 DAT (4) 16 DAT (4) 23 DAT (4) 7/20/14 7/26/14 8/2/14 8/10/14 8/18/14 8/25/14 1 Untreated Check
8 DAT 7/10/14
16 DAT 1 DAT (2) 7/18/14
23 DAT 8 DAT (2) 7/25/14
29 DAT 6 DAT (3) 7/31/14
36 DAT 13 DAT (3) 8/7/14
44 DAT 21 DAT (4) 8/15/14
0%
0%
0%
0%
0%
0%
Research results
1.0
1.0
1.0
1.0
1.0
1.0
0.1 fl. oz./a 0.5% v/v
2.3
4.3
5.3
4.8
2.6
1.5
1.0
3 Pylex, plus 0.1 fl. oz./a Turflon Ester, 1 fl. oz./a plus MSO 0.5% v/v
3.3
4.9
6.5
7.0
5.6
4.5
3.3
4 Pylex, plus MSO
0.2 fl. oz./a 0.5% v/v
3.0
4.8
5.8
5.8
4.0
3.3
2.3
5 Pylex, plus 0.2 fl. oz/a Turflon Ester, 1 fl. oz./a plus MSO 0.5% v/v
4.8
6.4
7.4
8.1
7.1
5.1
4.0
6 Revolver
1.0
1.0
1.0
1.0
1.0
1.0
1.0
0.5
0.6
0.5
0.5
0.6
0.6
0.7
17.4 fl. oz./a
LSD (P= .05)
Table 2. Goosegrass control when treatments were applied to 2-to-3-leaf goosegrass. % Control at 2-to-3-Leaf Goosegrass
1 Untreated Check 2 Pylex, plus MSO
0.1 fl. oz./a 0.5% v/v
34%
55%
44%
67%
66%
65%
3 Pylex, plus Turflon Ester, plus MSO
0.1 fl. oz./a 1 fl. oz./a 0.5% v/v
48%
64%
63%
87%
89%
87%
4 Pylex, plus MSO
0.2 fl. oz./a 0.5% v/v
58%
96%
98%
100%
100%
100%
5 Pylex, plus Turflon Ester, plus MSO
0.2 fl. oz/a 1 fl. oz./a 0.5% v/v
93%
99%
99%
100%
98%
98%
6 Revolver
17.4 fl. oz./a
56%
84%
97%
100%
99%
97%
20
25
36
24
28
28
LSD (P= .05)
Our research
This trial was conducted on an established stand of Tifway 419 bermudagrass. Four applications of Pylex treatments, spaced one week apart, or two applications of Revolver, two weeks apart, were made. For turf tolerance, the treatments were made on: • June 10, 2014, under 81˚F air temperature, 65% relative humidity and 30% cloud cover • June 17, 2014, under 84˚F air temperature, 65% relative humidity and 10% cloud cover • June 26, 2014, under 84˚F air temperature, and 20% cloud cover • July 2, 2014, under 88˚F air temperature and 20% cloud cover Goosegrass was grown in pots and treated at either the 2-to-3-leaf or 2-to3-tiller growth stage. In both situations, 4 applications of Pylex treatments or 2 applications of Revolver were made. Goosegrass was treated at a different time than bermudagrass.
1.0
2 Pylex, plus MSO
G
oosegrass is a troublesome weed in turfgrass, as it generally is more difficult to control than crabgrass species. We evaluated the potential for Pylex (topramezone) applied along or in combination with Turflon Ester (triclopyr) for goosegrass control and bermudagrass tolerance. We compared these treatments to Revolver.
24 | Virginia Turfgrass Journal May/June 2015 www.vaturf.org
Bermudagrass injury increased when the Pylex rate was increased or when Turflon Ester was added to Pylex (Table 1). Unacceptable injury to bermudagrass was noted at 3 days after the second application (3 DAT2), at 9 DAT2 and at 6 DAT3 from all treatments containing Pylex. At 16 days after 4 applications (16 DAT4), bermudagrass injury was at acceptable levels when Pylex was applied