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Influence of Rainfree Period After Asulam Application on Johnsongrass (Sorghum halepense) Control

Published online by Cambridge University Press:  12 June 2017

Stacey A. Bruff ,
James L. Griffin  and
Edward P. Richard Jr.
Stacey A. Bruff
Affiliation:
Dep. Plant Pathol. and Crop Physiol., 302 Life Sci. Bldg., Baton Rouge, LA 70803
James L. Griffin
Affiliation:
Dep. Plant Pathol. and Crop Physiol., 302 Life Sci. Bldg., Baton Rouge, LA 70803
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

A rainfall simulator was used to deliver the equivalent of 1.3 cm of water in 0.25 h at 0, 3, 6, 12, 24, and 48 h after POST applications of asulam to johnsongrass in greenhouse and field studies. Johnsongrass control responses were similar when asulam was applied with either a crop oil concentrate or a commercially blended organosilicone/crop oil concentrate premix. Rainfall 24 h after asulam application reduced johnsongrass control in greenhouse studies. Maximum visual johnsongrass control of 80, 69, and 69% was obtained in field studies when rainfall occurred 20, 14, and 8 h after asulam application, respectively. Based on reductions in johnsongrass dry weight, rainfree periods needed to insure maximum performance with asulam in field studies ranged from 3 to 16 h. Variation in critical rainfree periods was related to plant growth stage when asulam was applied and environmental conditions and is indicative of the inconsistency in johnsongrass control commonly observed with asulam.

Keywords

Asulam, methyl[(4-aminophenyl)sulfonyl] carbamatejohnsongrass, Sorghum halepense (L.) Pers. # SORHACritical rainfree periodcrop oil concentrateherbicide washofforganosiliconesugarcaneSaccharum spSACOFSORHA
Type
Research
Information
Weed Technology , Volume 9 , Issue 2 , June 1995 , pp. 316 - 320
Copyright
Copyright © 1995 by the Weed Science Society of America 

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