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Glyphosate Dose Affected Control of Field Dodder (Cuscuta campestris) in the Tropics

Published online by Cambridge University Press:  20 January 2017

Shawn M. Hock ,
Greg Wiecko  and
Stevan Z. Knezevic
Shawn M. Hock
Affiliation:
College of Natural and Applied Sciences, University of Guam, UOG Station, Mangilao, Guam 96923
Greg Wiecko
Affiliation:
College of Natural and Applied Sciences, University of Guam, UOG Station, Mangilao, Guam 96923
Stevan Z. Knezevic*
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska Northeast Research and Extension Center, 57905-866 Road, Concord, NE 68728
*
Corresponding author's E-mail: [email protected]
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Abstract

Field and greenhouse experiments were conducted in 2005 and 2006 in Guam to evaluate the effects of glyphosate on field dodder control and to describe glyphosate dose–response curves on selected ornamental plants grown with and without dodder infestation. Visual quality of dodder-free plants decreased with increasing dose of glyphosate. The most sensitive species was king's mantle, whereas the most tolerant was hibiscus. The values for the effective dose for a 10% reduction in visual quality (ED10) of glyphosate were 800, 280, 1,250, 370, 590, 830, 660, and 170 g ai/ha for dodder-free croton, allamanda, hibiscus, paper gardenia, ixora, duranta, schefflera, and king's mantle, respectively. However, dodder-infested plants were less tolerant to glyphosate because of the confounded stress from both the parasite and herbicide. Field dodder parasitizing ornamental plants could be adequately controlled on all ornamental species at a dose of about 140 g/ha of glyphosate.

Keywords

Glyphosate, N-(phosphonomethyl)glycinefield dodder, Cuscuta campestris Y. CVCCAduranta, Duranta L. sppgarden croton, Codiaeum variegatum (L.) Blumehibiscus, Hibiscus L. sppixora, Ixora L. sppking's mantle, Thunbergia erecta (Benth.) T. Andersminiature schefflera, Schefflera arboricola (Hayata) Merrpaper gardenia, Tabernaemontana divaricata (L.) R. Br. ex Roemer & J.A. Schultespurple allamanda, Allamanda blanchetii A. DCDose–response curvesornamental speciesparasite
Type
Research
Information
Weed Technology , Volume 22 , Issue 1 , March 2008 , pp. 151 - 155
Copyright
Copyright © Weed Science Society of America 

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