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Response of Soybean Cultivars to Bentazon, Bromoxynil, Chloroxuron, and 2,4-DB

Published online by Cambridge University Press:  12 June 2017

L. M. Wax ,
R. L. Bernard  and
R. M. Hayes
L. M. Wax
Affiliation:
Agr. Res. Serv., U.S. Dep. of Agr., Univ. of Illinois, Urbana, IL 61801
R. L. Bernard
Affiliation:
Agr. Res. Serv., U.S. Dep. of Agr., Univ. of Illinois, Urbana, IL 61801
R. M. Hayes
Affiliation:
Dep. of Agron., Univ. of Illinois, Urbana, IL 61801
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Abstract

The response of several hundred soybean [Glycine max (L.) Merr.] cultivars to postemergence application of four herbicides was evaluated in the field, greenhouse, and growth chamber in 1970, 1971, and 1972. Postemergence application of 3.4 kg/ha of bentazon [3-isopropyl-1H-2,1,3-benzothiadiazin-(4)3H-one 2,2-dioxide] did not significantly reduce yields of the seven commercially important soybean cultivars evaluated. All entries in the regional breeding trials, Uniform Test I to IV, were relatively tolerant of postemergence applications of the herbicides at rates about double those required for weed control. The observed order of phytotoxicity was 3.4 kg/ha of bentazon < 3.4 kg/ha of chloroxuron [3-[p-(p-chlorophenoxy)phenyl]-1,1-dimethylurea] < 0.3 kg/ha of bromoxynil (3,5-dibromo-4-hydroxybenzonitrile) = 0.4 kg/ha of 2,4-DB [4-(2,4-dichlorophenoxy)butyric acid]. Of the 338 named U.S. and Canadian cultivars in the U.S. Department of Agriculture soybean germplasm collection, all but one were tolerant to a postemergence application of 3.4 kg/ha bentazon. One U.S. cultivar, ‘Hurrelbrink,’ and ten plant introductions from Japan were highly sensitive to bentazon. These 11 cultivars were also highly sensitive to bromoxynil and 2,4-DB and somewhat sensitive to chloroxuron.

Type
Research Article
Information
Weed Science , Volume 22 , Issue 1 , January 1974 , pp. 35 - 41
Copyright
Copyright © 1974 by the Weed Science Society of America 

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