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Picloram and its Effect on Field-Grown Tobacco

Published online by Cambridge University Press:  12 June 2017

Glenn G. Klingman  and
Hernan Guedez
Glenn G. Klingman
Affiliation:
North Carolina State University, Raleigh
Hernan Guedez
Affiliation:
North Carolina State University, Raleigh
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Abstract

Preliminary observations indicate that tobacco is extremely sensitive to 4-amino-3,5,6-trichloropicolinic acid (picloram). This study was conducted to determine the effect of time and rate of treatment on tobacco yield, quality, dollars per acre, and the effect on chemical constituents in the tobacco. Results indicated that picloram remaining in the soil as a residue at rates of 5 g/A and above can cause serious damage to tobacco. A broadcast spray applied shortly after setting the tobacco in the field was most injurious to tobacco. One-half g/A at this time reduced dollars per acre by about 50%. The tobacco plant gained tolerance to 2.5 g/A by the time it was 24 in tall.

Treatments made when the tobacco was 24 in tall and also when treated after topping controlled suckers at rates of 0.5 and also at 2.5 g/A.

Type
Research Article
Information
Weeds , Volume 15 , Issue 2 , April 1967 , pp. 142 - 146
Copyright
Copyright © 1967 Weed Science Society of America 

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