| |
| Publication Type:
| Report |
|---|
| Content Type: | Abstract or Summary only |
|---|
| Author(s): | Willard, T. R.;
Currey, W. L. |
|---|
| Author Affiliation: | University of Florida |
|---|
| Title: | Herbicides Programs for Bahiagrass Management on Florida Highway Rights-of-Way. |
|---|
| Source: | Southern Weed Science Society Proceedings. Vol. 39, January 1986, p. 149. |
|---|
| Publishing Information: | Nashville, TN: Southern Weed Science Society. |
|---|
| Keywords: | TIC Keywords: Paspalum notatum; Cynodon; Eremochloa ophiuroides; Herbicides
|
|---|
| Abstract/Contents: | "During the fiscal year 1984-85 the Florida Department of Transportation maintained 112,000 acres of roadside vegetation. A total of 463,000 acres were mowed at a cost of $6.7 million. The statewide average was four mowings per year at $14.63/acre/mowing. During this same period, 56,000 acres were treated under a selective broadcast weed control program at a cost of $619,000 or $11.11/acre. Florida DOT has expressed a desire to increase the efficiency of their maintenance programs through reduced mowing and selective broadcast weed control, while improving the quality of their roadside turfgrasses. The dominant roadside turf species in Florida is 'Pensacola' bahiagrass (Paspalum notatum). Common bermudagrass (Cynodon dactylon) and centipedegrass (Eremochloa ophiuroides) are also present, usually in mixed stands with bahiagrass. In cooperation with the Florida DOT, studies were initiated in 1982 to study the use of herbicides for suppression of bahigrass seedhead formation and release of bermudagrass. Plots were located in the interchange of Rt. 441/301 north of Ocala, Fl in a mixed stand of bahiagrass and bermudagrass. The first study dealt with applications of sulfometuron at 0.025, 0.052, and 0.103 kg/ha ai applied at four times (12/82, 2/83, 4/83, 6/83) and three timing combinations (12/82 + 4/83, 2/83 + 6/83, and 4/83 + 6/83). To determine the effect of repeated applications of sulfometuron on bahiagrass persistence those plots receiving single spring treatments in 1983 were treated with the same rate on 4/3/84. In 1985 a third study was initiated to evaluate several new herbicides for bahiagrass suppression and/or bermudagrass release. Imazapyr was applied at 0.0083, 0.0165, and 0.033 kg/ha ai, sulfometuron at 0.018 and 0.025 kg/ha ai, hexazinone at 0.83 kg/ha ai, and sethoxydim alone at 0.11 kg/ha ai and in combination with sulfometuron at 0.025 kg/ha ai or hexazinone at 0.83 kg/ha ai on 6/19/85. Fall and winter applications of sulfometuron were ineffective in suppressing bahiagrass seedhead formation at any rate studied. Spring (4/83) and summer (6/83) applications at 0.052 and 0.103 kg/ha ai resulted in unacceptable bahiagrass injury. Sequential applications did not provide any advantage over single applications.. The optimal rate and timing of sulfometuron at this location was 0.025 kg/ha ai applied in early spring. This treatment did not injure bahiagrass of bermudagrass and provided complete suppression of bahiagrass seedheads for three months. Repeated applications of sulfometuron at 0.025 and 0.052 kg/ha ai did not affect the stand composition of bahiagrass or bermudagrass. Of the new herbicides evaluated in 1985, imazapyr at 0.033 kg/ha ai and sethoxydim at 0.11 kg/ha ai provided over 90% suppression of bahiagrass seedheads at 52 days after application without injury to bahiagrass or bermudagrass. Bermudagrass release was attained when sulfometuron was applied at either rate. Bermudagrass release was attained when sulfometuron was applied at either rate. This was due to the severe bahiagrass injury that resulted from this application being made during the summer. Percent cover of bahiagrass increased 13 to 18 percent when imazapyr was applied." |
|---|
| Language: | English |
|---|
| References: | 0 |
|---|
| Note: | This item is an abstract only! |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Willard, T. R., and W. L. Currey. 1986. Herbicides Programs for Bahiagrass Management on Florida Highway Rights-of-Way.. South. Weed Sci. Soc. Proc. 39:p. 149. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=14029 |
| If there are problems with this record, send us feedback about record 14029. |
| Choices for finding the above item: |
|---|
| 
MSU catalog number: SB 611 .S6 |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
