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Responses of Six Morningglory (Ipomoea) Species to Bentazon

Published online by Cambridge University Press:  12 June 2017

M. R. McClelland ,
L. R. Oliver ,
W. D. Mathis  and
R. E. Frans
M. R. McClelland
Affiliation:
Dep. of Agron., Univ. of Arkansas, Fayetteville, AR 72701
L. R. Oliver
Affiliation:
Dep. of Agron., Univ. of Arkansas, Fayetteville, AR 72701
W. D. Mathis
Affiliation:
Dep. of Agron., Univ. of Arkansas, Fayetteville, AR 72701
R. E. Frans
Affiliation:
Dep. of Agron., Univ. of Arkansas, Fayetteville, AR 72701
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Abstract

Field and greenhouse tests were conducted from 1974 to 1976 to determine the most effective rate and number of applications of bentazon [3-isopropyl-1H-2,1,3-benzothiadiazin-(4)3H-one 2,2-dioxide] for the control of six morningglory (Ipomoea) species. Growth chamber studies were conducted to determine photosynthesisrespiration equilibrium points (PRE-points) on two morningglory species. These units were used to measure the duration of the phytotoxic effect of bentazon on these morningglories from both single and repeat applications. Declining PRE-points indicated declining bentazon toxic activity within the plant. A treatment of two applications of bentazon at 0.84 kg/ha applied at a 4-day interval beginning with 2-week-old morningglory plants was optimal for maintaining a high PRE-point level. In field and greenhouse studies the greatest toxicity, regardless of morningglory species, occurred with bentazon at 0.84 or 1.12 kg/ha applied at 14 days and repeated at 28 days after emergence and 0.56 kg/ha applied three times with the first application made 14 days after emergence. Differences in susceptibility of the individual species indicated the importance of proper species identification before bentazon applications.

Keywords

HerbicidePRE-pointtoxicity effects
Type
Research Article
Information
Weed Science , Volume 26 , Issue 5 , September 1978 , pp. 459 - 464
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

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