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Control of Rhizome Johnsongrass (Sorghum Halepense) in Sugarcane with Trifloxysulfuron and Asulam

Published online by Cambridge University Press:  20 January 2017

Caleb D. Dalley  and
Edward P. Richard Jr
Caleb D. Dalley*
Affiliation:
USDA-ARS-SRRC, Sugarcane Research Laboratory, 5883 USDA Road, Houma, LA 70360
Edward P. Richard Jr
Affiliation:
USDA-ARS-SRRC, Sugarcane Research Laboratory, 5883 USDA Road, Houma, LA 70360
*
Corresponding author's E-mail: [email protected]
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Abstract

It has been suggested that trifloxysulfuron might increase the efficacy of asulam for control of johnsongrass. Container and field studies were conducted to determine the efficacy of POST applications of trifloxysulfuron and asulam for johnsongrass control in sugarcane. Asulam was applied at 460 and 920 g ai/ha to container-grown johnsongrass plants, with and without 8 g ai/ha of trifloxysulfuron. Combinations of asulam and trifloxysulfuron generally reduced johnsongrass height, rhizome length, and biomass more than when either was applied alone. Results suggested that combinations of asulam and trifloxysulfuron were synergistic in their control of johnsongrass biomass 8 wk after treatment. In a sugarcane field heavily infested with rhizome johnsongrass, asulam was applied at 1,800, 2,800, and 3,700 g/ha with and without trifloxysulfuron at 16 g/ha. Asulam plus trifloxysulfuron generally controlled johnsongrass more effectively than either herbicide alone. The control of johnsongrass with asulam at 1,800 g/ha resulted in an increase in sugar yield of more than twice that in the nontreated control. Sugar yield increased further when asulam was applied at 2,800 g/ha or combined with trifloxysulfuron, but application of trifloxysulfuron alone did not increase yield. Combinations of asulam and trifloxysulfuron might slow the spread of rhizome johnsongrass enough to allow an increased number of ratoon crops before sugarcane fields need to be replanted.

Keywords

Asulamtrifloxysulfuronjohnsongrass, Sorghum halepense L. Pers. SORHAsugarcane, Saccharum interspecific hybrid ‘LCP 85-384’Herbicideperennial weed controlsynergismweed interference
Type
Weed Management — Major Crops
Information
Weed Technology , Volume 22 , Issue 3 , September 2008 , pp. 397 - 401
Copyright
Copyright © Weed Science Society of America 

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