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Optimizing Diluent Volume Improves Johnsongrass Control in Sugarcane (Saccharum sp.) with Asulam

Published online by Cambridge University Press:  12 June 2017

Edward P. Richard Jr.
Edward P. Richard Jr.*
Affiliation:
Sugarcane Res. Unit, Agric. Res. Serv., U.S. Dep. Agric., P.O. Box 470, Houma, LA 70361
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Abstract

Field studies were conducted in second-ratoon crops of sugarcane infested with rhizome johnsongrass to determine the effects of aqueous diluent volumes ranging from 47 to 561 L ha-1 on the performance of asulam. Trend analyses of johnsongrass recovery, based on panicle numbers late in the growing season, indicated a quadratic response with panicle numbers being lowest when asulam at 2.8 kg ai ha-1 was applied in a diluent volume approaching 187 L ha-1. The response was similar regardless of whether droplet size or number was altered to obtain these diluent volumes. Differences in late-season johnsongrass control were reflected in harvested sugarcane stalk populations and net cane yields. In greenhouse studies, johnsongrass plants were thoroughly washed with water 24 h after treatment with asulam at 2.8 kg ha-1 at water volumes ranging from 47 to 374 L ha-1. Asulam absorption, as evidenced by reduction in the growth of johnsongrass, was higher when surfactant was included, but was not affected by diluent volumes in the range evaluated.

Keywords

Asulam, methyl [(4-aminophenyl)sulfonyl]carbamatesugarcane, Saccharum interspecific hybrids ‘CP 65-357’ and ‘CP 72-370’johnsongrass, Sorghum halepense (L.) Pers. ♯ SORHAHerbicide penetrationherbicide absorptiondroplet effects
Type
Research
Information
Weed Technology , Volume 5 , Issue 2 , June 1991 , pp. 363 - 368
Copyright
Copyright © 1991 Weed Science Society of America 

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