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Pendimethalin Phytotoxicity to Velvetleaf (Abutilon theophrasti) and Powell Amaranth (Amaranthus powellii)

Published online by Cambridge University Press:  12 June 2017

Timothy Malefyt  and
William B. Duke
Timothy Malefyt
Affiliation:
Dep. Agron., Cornell Univ., Ithaca, NY 14853
William B. Duke
Affiliation:
Dep. Agron., Cornell Univ., Ithaca, NY 14853
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Abstract

Velvetleaf (Abutilon theophrasti Medic. ♯3 ABUTH) and Powell amaranth (Amaranthus powellii S. Wats. ♯ AMAPO) control with pendimethalin [N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine] was dependent on proper timing of application. Preemergence and early postemergence pendimethalin treatments provided effective control, but control rapidly diminished with later postemergence treatments, particularly on Powell amaranth. Time-course studies on the effects of pendimethalin on the growth of these species indicated that pendimethalin inhibited shoot growth by slowing or stopping the production of leaves and branches, as well as reducing leaf size and internode length. Pendimethalin appeared to have its greatest effect on portions of the shoot undergoing cell division.

Keywords

Growth stageleaf expansiongrowth inhibition
Type
Weed Biology and Ecology
Information
Weed Science , Volume 32 , Issue 4 , July 1984 , pp. 520 - 524
Copyright
Copyright © 1984 by the Weed Science Society of America 

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References

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