| |
| Publication Type:
| Report |
|---|
| Content Type: | Abstract or Summary only |
|---|
| Author(s): | McCarty, L. B. |
|---|
| Author Affiliation: | Department of Environmental Horticulture, University of Florida, Gainesville, FL 32611-0670. |
|---|
| Title: | Selective bermudagrass control in St. Augustinegrass turf |
|---|
| Meeting Info.: | Dallas, TX: January 17-19, 1994 |
|---|
| Source: | Southern Weed Science Society Proceedings. Vol. 47, 1994, p. 72-73. |
|---|
| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
|---|
| # of Pages: | 2 |
|---|
| Keywords: | TIC Keywords: Stenotaphrum secundatum; Cynodon dactylon; Encroachment; Chemical control; Herbicide application; Weed control; Ethofumesate; Flurprimidol; Atrazine; Siduron; Glyphosate; Phytotoxicity
|
|---|
| Abstract/Contents: | "St. Augustinegrass (Stenotaphrum secudatum) sod production encompasses 40,000 acres in Florida. The primary weed for these growers is common bermudagrass (Cynodon dactylon CYNDA). Current control involves repeated spot treatment with a non-selective herbicide such as glyphosate which also kills the St. Augustine grass and requires extensive hand labor and specially designed application equipment. Research was initiated in 1989 at the University of Florida with the goal of selectively controlling bermudagrass with minimum damage to St. Augustinegrass. Plots were 3.3 x 6m with 4 replicates per study designed in a randomized complete block. Herbicides were applied in 187 L/ha of water with a CO2-powered backpack sprayer. Percent bermudagrass control and turf phytotoxicity were rated visually. In 1989 and 1990 ethofumesate (Prograss) was applied at 1.5 and 3.0 lb ai/a either in February, March, April, or as February + March + April combinations. February and April applications, regardless of rate, provide little (2 to 27%) control through 11 weeks after initial treatment (WAIT). March applications had slightly better control (33 to 41%). February + March combination treatments provided up to 66% control for the high rate but this was only short-term (5 to 8 WAIT). Best control (86%) after 11 WAIT followed February + March + April applications at the high rate. In 1991 the February treatments were deleted due to lack of performance while a May treatment was added. A combination of ethofumesate + flurprimidol (Cutless at 1 lb ai/a) also added. Control was highest (80%) for the April + May ethofumesate + flurprimidol combination through 13 WAIT followed by the ethofumesate alone treatments made in April + May (50% control). In 1992 November treatments were added as were a tank mixes of ethofumesate + atrazine (1 lb ai/a) and ethofumesate + siduron (Tupersan at 6 lb ai/a). Overall, November treatments provided poor control (<25%) and added little to November + March or November + March + April applications. Excellent bermudagrass control (89%) followed March + April applications through 26 WAIT for all ethofumesate alone treatments and combinations with flurprimidol, atrazine or siduron. Control after 29 WAIT was highest (72%) following ethofumesate + atrazine applications made in March + April. In 1993 only March + April + May applications were made. An additional treatment of clethodim (Select) at 0.125 lb ai/a also was included. Control was excellent (89%) at 12 WAIT for the combinations of ethofumesate + flurprimidol, ethofumesate + atrazine, and ethofumesate + siduron. By 16 WAIT, excellent bermudagrass control followed ethofumesate alone, ethofumesate + atrazine, and ethofumesate + siduron. Clethodim provided good control (87%) at this time while the ethofumesate + flurprimidol provided 68% control. St. Augustinegrass tolerance was acceptable for all treatments except the ethofumesate + flurprimidol combination which had unacceptable phytotoxicity through 12 weeks after treatment. Overall, best long-term bermudagrass control with the least amount of St.Augustinegrass damage followed two or three applications of ethofumesate (3 lb ai/a) + atrazine (1 lb ai/a) made either in March + April or March + April + May. Control was next best for combinations of ethofumesate + siduron (6 lb ai/a) made at similar timings. Research will be repeated in 1994 to confirm 1992 and 1993 results." |
|---|
| Language: | English |
|---|
| References: | 0 |
|---|
| See Also: | See also full article, Crop Science, 36(3) May/June 1996, p. 694-698, R=38642 R=38642 |
|---|
| Note: | This item is an abstract only! |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McCarty, L. B. 1994. Selective bermudagrass control in St. Augustinegrass turf. South. Weed Sci. Soc. Proc. 47:p. 72-73. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=33740 |
| If there are problems with this record, send us feedback about record 33740. |
| Choices for finding the above item: |
|---|
| 
MSU catalog number: SB 611 .S6 v.47 |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
