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Effects of Amitrole on Purple Nutsedge at Different Growth Stages

Published online by Cambridge University Press:  12 June 2017

Ellis W. Hauser
Ellis W. Hauser*
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture. Formerly located at Experiment, Georgia
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Abstract

Amitrole (3-amino-1,2,4-triazole) was applied to purple nutsedge (Cyperus rotundus L.) clones newly established in the field in the Piedmont Plateau. Applications were made one week after initial foliar emergence, then at biweekly intervals through the 20th week. The principal results were: (1) Nutsedge was most susceptible to amitrole applied 4 weeks after initial emergence. The next most susceptible stages were at 1 or 2 weeks; (2) Six weeks after emergence, nutsedge appeared resistant to amitrole; (3) All applications after 10 weeks were relatively ineffective; (4) Chemical analyses of tubers and bulbs indicated a high ash content early in the season, particularly at 6 weeks after emergence.

Type
Research Article
Information
Weeds , Volume 11 , Issue 3 , July 1963 , pp. 181 - 183
Copyright
Copyright © 1963 Weed Science Society of America 

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References

Literature Cited

1. Anderson, Otto. 1958. Studies on the absorption and translocation of amitrole (3-amino-1,2,4-triazole) by nutgrass (Cyperus rotundus L.). Weeds 6:370–385.Google Scholar
2. Hauser, E. W., and Thompson, J. T. 1956. Progress report on the differential responses of the nutgrasses (Cyperus rotundus and Cyperus esculentus) to herbicides and disking. Proc. SWC 9:211–219.Google Scholar
3. Hauser, E. W., and Thompson, J. T. 1962. Establishment of nutsedge from space-planted tubers. Weeds 10:209–212.CrossRefGoogle Scholar
4. Hauser, E. W., and Thompson, J. T. 1962. Development of purple nutsedge under field conditions. Weeds 10:315–321.CrossRefGoogle Scholar