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Potted tropical ornamental tolerance to multiple PRE herbicides

Published online by Cambridge University Press:  25 November 2020

Nathan S. Boyd Open the ORCID record for Nathan S. Boyd [Opens in a new window]  and
Shawn Steed
Nathan S. Boyd*
Affiliation:
Associate Professor, University of Florida, Gulf Coast Research and Education Center, Balm, FL, USA
Shawn Steed
Affiliation:
Environmental Horticulture Production Extension Agent III, University of Florida, Seffner, FL, USA
*
Author for correspondence: Nathan S. Boyd, University of Florida, Gulf Coast Research and Education Center, 14625 County Road 672, Balm, FL33598. (E-mail: [email protected])
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Abstract

Weeds are difficult to control in potted tropical ornamentals, especially when plants are kept for extended time periods at a nursery. Management is complicated by the lack of tolerance data for many tropical species. Experiments were conducted in 2015, 2016, and 2017 at the Gulf Coast Research and Education Center in Balm, FL, to evaluate tolerance of stromanthe, croton, philodendron, arbicola, cordyline, ixora, plumbago, allamanda, bird-of-paradise, firebush, and hibiscus to granular applications of indaziflam, flumioxazin, pendimethalin + oxyfluorfen, pendimethalin + dimethenamid-P, trifluralin + oxyfluorfen + isoxaben, and trifluralin + isoxaben, and liquid applications of prodiamine + isoxaben and dimethenamid-P. Indaziflam, pendimethalin + oxyfluorfen, and trifluralin + oxyfluorfen + isoxabin were safe for use on all evaluated ornamentals except stromanthe. Dimethenamid-P and pendimethalin + oxyfluorfen were safe on all evaluated ornamentals except allamanda. Flumioxazin damaged philodendron and bird-of-paradise but was safe on all other ornamentals tested. Trifluralin + isoxaben and prodiamine + isoxaben were safe on hibiscus, firebush, and bird-of-paradise, but prodiamine + isoxaben damaged allamanda. We have identified multiple PRE herbicides that can safely be used on multiple tropical ornamentals grown in containers.

Keywords

Dimethenamid-PflumioxazinindaziflamisoxabenoxyfluorfenpendimethalinprodiaminetrifluralinallamandaAllamanda schottii Pohl.arbicolaSchefflera arboricola (Hayata) Merr. ‘Trinette’bird-of-paradiseStrelitzia reginae AitoncordylineCordyline fruticosa (L.) A. Chev. ‘Red Sister’crotonCodiaeum variegatum (L.) A. Juss. ‘Mammy’firebushHamelia patens Jacq.hibiscusHibiscus rosa-sinensis L. ‘Painted Lady’ixoraIxora coccinea L. ‘Maui Red’philodendronPhilodendron selloum K. KochplumbagoPlumbago auriculata Lam. ‘Dark Blue’stromantheStromanthe sanguinea Sond. ‘Triostar’.Broadleafcontainer weed controlpotting soilpreemergence
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 4 , August 2021 , pp. 623 - 627
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Robert Nurse, Agriculture and Agri-Food Canada

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