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Smutgrass (Sporobolus indicus) Control in Bahiagrass (Paspalum notatum) Pastures

Published online by Cambridge University Press:  12 June 2017

Paul Mislevy ,
Donn G. Shilling ,
Frank G. Martin  and
Stephan L. Hatch
Paul Mislevy*
Affiliation:
Range Cattle Research Education Center, University of Florida, IFAS, 3401 Experiment Station, Ona, FL 33865-9706
Donn G. Shilling
Affiliation:
West Florida Research Education Center, University of Florida, IFAS, 4253 Experiment Drive, Highway 182, Jay, FL 32565-0524
Frank G. Martin
Affiliation:
Statistics Department, University of Florida, IFAS, Gainesville, FL 32611-0339
Stephan L. Hatch
Affiliation:
S. M. Tracy Herbarium, Department Rangeland Ecology and Management, Texas A&M University, College Station, TX 77843-2126
*
Corresponding author's E-mail: [email protected].
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Abstract

Field experiments were conducted in 1989 and 1990 to evaluate seasonal effects of herbicide application, smutgrass (Sporobolus indicus) growth stage, and herbicide rate on smutgrass control. The experimental design was a split–split plot, with season (late spring, midsummer, and fall) as the whole plot, physiological stage at application (uncut, 15-, and 30-cm regrowth) the subplot, and hexazinone rate (0.0, 0.56, 0.84, and 1.12 kg ai/ha) as the sub-subplot treatment. Whole plots were arranged in three randomized complete blocks. Smutgrass control for the mean of the hexazinone treatments (1989 and 1990) was 95%. Application of 0.56 kg/ha hexazinone during late spring, midsummer, and fall seasons provided 77, 92, and 92% smutgrass control, respectively. Generally, the influence of plant stage at time of hexazinone application had no effect (P > 0.05) on smutgrass control. At 20 d after treatment (DAT), hexazinone had injured bahiagrass (Paspalum notatum) plants by yellowing them, but the plants reverted to their usual dark green color by 40 DAT. Total nonstructural carbohydrates were lower for the 30-cm regrowth than for the uncut plants, regardless of season; however, 30-cm regrowth had little effect on smutgrass control.

Keywords

Hexazinone, 3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4 (1H, 3H)-dionesmutgrass, Sporobolus indicus (L.) R. Br. var. indicus # SPZINtropical soda apple, Solanum viarum Dunal # SOLVIbahiagrass, Paspalum notatum Fluegge # PASNOPasture weedstropical foragegrass weed controlhexazinoneSOLVISPZINDAT, days after treatmentGC, ground coverTNC, total nonstructural carbohydrates
Type
Research
Information
Weed Technology , Volume 13 , Issue 3 , September 1999 , pp. 571 - 575
Copyright
Copyright © 1999 by the Weed Science Society of America 

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References

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