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Mechanical and Chemical Control of Cogongrass (Imperata cylindrica)

Published online by Cambridge University Press:  12 June 2017

Thomas R. Willard ,
Donn G. Shilling ,
James F. Gaffney  and
Wayne L. Currey
Thomas R. Willard
Affiliation:
Amer. Agric., Inc., Cary, NC
Donn G. Shilling
Affiliation:
Univ. Fla., Gainesville, FL
James F. Gaffney
Affiliation:
Univ. Fla., Gainesville, FL
Wayne L. Currey
Affiliation:
Weed Sys. Inc., Keystone Heights, FL
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Abstract

Field studies were initiated in 1985 and 1986 to evaluate the effects of dalapon, glyphosate, imazapyr, and sulfometuron applications to established cogongrass alone or in combination with either mowing or discing. Mowing and discing treatments were performed 4 mo before and 8 months after the herbicide treatments in the 1985 experiments and 2 months before and 7 months after the herbicide treatment in the 1986 experiments. When applied alone, glyphosate at 3.4 kg ai/ha and imazapyr at 0.8 kg ai/ha caused the greatest reduction in shoot and rhizome biomass about 2 yr after application. However, the rhizome infestation was reduced only 43% by glyphosate and 51% by imazapyr, as compared to the nontreated control. With no herbicide, two mowing or discing were generally more effective than a single mowing or discing treatment. The reduction in shoot and rhizome biomass for two mowing without herbicide was 65 and 38% and for two discing, 73 and 66%, respectively. Acceptable (> 80%) levels of cogongrass control, based on reductions in rhizome biomass occurred only when applications of dalapon, glyphosate, or imazapyr were made in combination with two discing despite the fact that mowing before and after treatment reduced shoot biomass by at least 89%.

Keywords

Dalapon, 2,2-dichloropropanoic acidglyphosate, N-(phosphonomethyl)glycineimazapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-pyridinecarboxylic acidsulfometuron, 2-[[[[(4,6-dimethyl-2 pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoic acidcogongrass, Imperata cylindrica (L.) Beauv. # IMPCYDiscingmowingperennialtillageweed control combinations
Type
Research
Information
Weed Technology , Volume 10 , Issue 4 , December 1996 , pp. 722 - 726
Copyright
Copyright © 1996 by the Weed Science Society of America 

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References

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