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Response of Cotton and Sorghum to Post-emergence Applications of Paraquat

Published online by Cambridge University Press:  12 June 2017

C. J. Scifres  and
P. W. Santelmann
C. J. Scifres
Affiliation:
Agronomy Department, Oklahoma State University, Stillwater, Oklahoma
P. W. Santelmann
Affiliation:
Agronomy Department, Oklahoma State University, Stillwater, Oklahoma
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Abstract

Cotton and grain sorghum were treated with directed paraquat (1,1′-dimethyl-4,4′-dipyridylium cation) sprays in the field. Tall cotton was less susceptible to the herbicide than smaller plants. Some cotton varieties showed greater susceptibility to paraquat than others. In general, fiber quality was not affected by paraquat at ⅛ and ¼ lb/A, although there was some effect on the fiber coarseness of the more susceptible varieties. Increasing light intensity caused more leaf damage from cotton stem applications of paraquat. Directed paraquat applications invariably caused the outer sorghum leaf sheaths to show necrotic spots where treated. Treatments on 6-inch sorghum reduced yields, but plants treated when taller than 6 inches were not injured. Thirteen sorghum hybrid and open-pollinated varieties showed varying degrees of leaf and sheath burn due to paraquat treatments.

Type
Research Article
Information
Weeds , Volume 14 , Issue 1 , January 1966 , pp. 86 - 88
Copyright
Copyright © 1966 Weed Science Society of America 

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References

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