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The Effect of Several Herbicides on the Control of Witchweed in Corn

Published online by Cambridge University Press:  12 June 2017

Paul F. Sand ,
E. L. Robinson  and
Clyde C. Dowler
Paul F. Sand
Affiliation:
Agricultural Research Service, United States Department of Agriculture, Whiteville, North Carolina, in cooperation with the North Carolina Agriculural Experiment Station, Raleigh, North Carolina
E. L. Robinson
Affiliation:
South Carolina Agricultural Experiment Station, Clemson, South Carolina
Clyde C. Dowler
Affiliation:
Agricultural Research Service, United States Department of Agriculture, Whiteville, North Carolina, in cooperation with the North Carolina Agriculural Experiment Station, Raleigh, North Carolina
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Abstract

The alkanolamine salt of 2,4-dichlorophenoxyacetic acid (2,4-D), the dimethylamine salt of 2,3,6-trichlorobenzoic acid (2,3,6-TBA), and the sodium salt of 2,3,6-trichlorophenylacetic acid (fenac), were evaluated in controlling witchweed and toxicity to corn on germinating seed in petri dishes, as preplan ting, preemergence, and postemergence treatments in the greenhouse and as preplanting, soil-incorporated treatments in the field. Corn roots were affected more than the shoots by each herbicide. Fenac and 2,4-D inhibited root growth of corn seedlings in petri dishes more than 2,3,6-TBA. Fenac was the most effective herbicide for control of witchweed and weedy grasses when applied as a preplanting, soil-incorporated treatment and controlled witchweed at rates which significantly increased corn yields. Applied preplanting, 2,4-D did not control witchweed and 2,3,6-TBA at rates which gave witchweed control equivalent to that obtained with fenac was toxic to corn.

Type
Research Article
Information
Weeds , Volume 12 , Issue 1 , January 1964 , pp. 37 - 39
Copyright
Copyright © 1964 Weed Science Society of America 

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References

Literature Cited

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