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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
Affiliation:
Dep. Agron., Cornell Univ., Ithaca, NY 14853
William B. Duke
Affiliation:
Dep. Agron., Cornell Univ., Ithaca, NY 14853

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.

Type
Weed Biology and Ecology
Copyright
Copyright © 1984 by the Weed Science Society of America 

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