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Response of Velvetleaf (Abutilon theoprasti) to Bentazon as Affected by Leaf Orientation

Published online by Cambridge University Press:  12 June 2017

R. N. Andersen  and
W. L. Koukkari
R. N. Andersen
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Dep. Agron. and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
W. L. Koukkari
Affiliation:
Dep. Botany, Univ. of Minnesota, St. Paul, MN 55108
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Abstract

Greenhouse and growth chamber studies were conducted to determine the cause of previously observed differences in the effectiveness of bentazon [3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide] when applied at various times of the day to velvetleaf (Abutilon theophrasti Medic). Leaves of velvetleaf moved rhythmically from a near horizontal day position to a near vertical night position with the tip of the blade pointed downward. Plants were sprayed with bentazon at various times of day. The amount of spray retained and the degree of control decreased as the leaves moved toward the vertical downward night position. This suggested that a major cause of the time-of-day effect with bentazon treatments on velvetleaf is variation in the amount of spray intercepted and retained as a function of varying leaf angles.

Keywords

Herbicideweed controlbiological rhythms
Type
Research Article
Information
Weed Science , Volume 26 , Issue 4 , July 1978 , pp. 393 - 395
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

Literature Cited

1. Doran, D. L. and Andersen, R. N. 1976. Effectiveness of bentazon applied at various times of the day. Weed Sci. 24:567–570.Google Scholar
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