Research Report
Dallisgrass Control in Bermudagrass Table 1. Percent dallisgrass control in June (23 days after the second spring application) and in November (22 days after the second fall application). Percent Dallisgrass Control Treatment, Rate and Timing 1
Untreated
2
Celsius
3.7
oz./a
3
4
5
6
7
Spring
+ Revolver
26.2
fl. oz./a
Spring
+ Celsius
3.7
oz./a
Spring 2
+ Revolver
26.2
fl. oz./a
Spring 2
Celsius
3.7
oz./a
Spring
+ Revolver
26.2
fl. oz./a
Spring
+ Celsius
3.7
oz./a
Fall
+ Revolver
26.2
fl. oz./a
Fall
Celsius
3.7
oz./a
Fall
+ Revolver
26.2
fl. oz./a
Fall
+ Celsius
3.7
oz./a
Fall 2
+ Revolver
26.2
fl. oz./a
Fall 2
Celsius
3.7
oz./a
Spring
+ Revolver
26.2
fl. oz./a
Spring
+ Celsius
3.7
oz./a
Spring 2
+ Revolver
26.2
fl. oz./a
Spring 2
+ Monument
0.53
oz./a
Fall
+ Monument
0.53
oz./a
Fall 2
Monument
0.53
oz./a
Spring
+ Monument
0.53
oz./a
Spring 2
Celsius
3.7
oz./a
Fall
+ Revolver
26.2
fl. oz./a
Fall
Celsius
3.7
oz./a
Fall 2
+ Revolver
26.2
fl. oz./a
Fall 2
MSMA
2.0
lb. ai/a
Spring
+ MSMA
2.0
lb. ai/a
Spring 2
+ MSMA
2.0
lb. ai/a
Fall 2
+ MSMA
2.0
lb. ai/a
Fall 2
LSD (P = .05)
June 29
November 30
23 DAT-B
22 DAT-D
0%
1%
45%
3%
0%
9%
0%
83%
45%
86%
44%
84%
53%
89%
27
5
Virginia Tech Researchers: Jeffrey F. Derr, Ph.D., Professor of Weed Science, and Adam Nichols, Research Assistant, Hampton Roads Agricultural Research and Extension Center, Virginia Beach Sponsors: Bayer Environmental Science, Virginia Turfgrass Council and Virginia Turfgrass Foundation
D
allisgrass (Paspalum dilatatum) is a troublesome weed in both cool- and warm-season turf. Its wide blades and tall seedheads make the weed especially conspicuous in bermudagrass turf. Dallisgrass is a warm-season perennial that goes dormant in the fall and resumes growth in the spring. This weed spreads by short rhizomes as well as by seed. Over time, dallisgrass clumps expand due to rhizome growth. MSMA, the most commonly used herbicide for dallisgrass control, currently can be used only in sod production and on golf courses and rights-ofway areas. Current MSMA labels do not allow applications to home lawns or commercial settings. It is unclear what products will be available to replace MSMA in the future, although it appears that uses for MSMA in golf, sod and rights of way will continue for three years. Additional control options are therefore needed for this weed in turf.
Our research
20 | Virginia Turfgrass Journal May/June 2013 www.vaturf.org
We have been investigating herbicides, herbicide combinations and