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| Publication Type:
| Report |
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| Author(s): | Goatley, J. M. Jr.;
Maddox, V. L. |
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| Author Affiliation: | Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762 and R.M. Watkins, American Cyanamid, Starkville, MS 39759 |
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| Title: | A summary of imidazolinone growth regulator trials on common bermudagrass and bahiagrass |
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| Meeting Info.: | 48th Annual Meeting, Memphis, TN, January 16-18, 1995 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 48, January 1995, p. 154. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Cynodon dactylon; Paspalum notatum; Imazaquin; Irrigation; Imidazolinone herbicides
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| Abstract/Contents: | "Research was conducted from 1990 through 1994 to examine the vegetative and reproductive growth regulating activity of imazaquin and AC 263,222 on common bermudagrass [Cynodon dactylon (L.) Pers.] and bahiagrass (Paspalum notatum Flugge). All turf areas received minimal or no fertilization and no supplemental irrigation. Studies conducted from 1990-1993 examined bermudagrass and bahiagrass growth responses following treatment with various levels and combinations of the imidazolinones, while the research of 1994 compared imidazolinones to other growth regulators used on bahiagrass. Bermudagrass color ratings for imazaquin alone at 0.38 lb/A were generally not significantly different from the untreated check by 2 WAT at any time during the years of 1990-92. Bermudagrass seedhead suppression ratings for imazaquin alone were variable across years, ranging from 8 to 55% at 4 WAT in May of 1990-92 and from 27 to 81% at 4 WAT in July of 1990-92. The variability can probaly be attributed to differences in environmental conditions, particularly deficits and extremes in rainfall. AC 263,222 alone at 0.05 lb/A or in combination with 0.19 lb/A imazaquin resulted in significantly lower color ratings as compared to imazaquin at 0.38 lb/A or the check, but the ratings only dipped below the minimal acceptable color rating of 6 (on a scale of 1=brown to 9=green) at 2 WAT in May 1990 and July 1992. The efficacy of imidazolilones as growth regulators was more pronounced for bahiagrass than for bermudagrass. All treatments caused color reductions compared to the control through 4 WAT in both 1992 and 1993, with the most discoloration observed from AC 263,222 applications at 0.05 lb/A. In 1992 and 1993, AC 263,222 at 0.05 lb/A provided total seedhead suppression through 8 WAT for monthly trials conducted from May-August, while imazaquin at 0.38 lb/A suppressed seedheads for a maximum of 4 weeks in any trial. AC 263,222 at 0.0125 or 0.025 lb/A provided 80 to 100% seedhead suppression through 8 WAT in July and August of 1993. The lower levels of AC 263,222 were adequate for periods when bahiagrass growth was slowed by limited rainfall and shorter day lengths. AC 263,222 applied at 0.032, 0.048, 0.064, or 0.0125 lb/A provided / 90% seedhead suppression of bahiagrass through 9 WAT of June, 1994. AC 263,222 at 0.016 lb/A resulted in 70% seedhead suppression through 7 WAT. All levels of AC 263,222 provided / 95% bahiagrass seedhead suppression through 9 WAT of July, 1994. Initial bahiagrass discoloration from levels of AC 263,222 / 0.048 lb/A was less for June treatment than for July." |
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| Language: | English |
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| References: | 0 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Goatley, J. M. Jr., and V. L. Maddox. 1995. A summary of imidazolinone growth regulator trials on common bermudagrass and bahiagrass. South. Weed Sci. Soc. Proc. 48:p. 154. |
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MSU catalog number: SB 611 .S6 v.48 |
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