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Validation of a Coupled Herbicide Fate and Target Plant Species Effects Model

A series of experiments provided data to parameterize and validate a coupled herbicide fate and target plant species effects model. This simulation model is currently designed to predict responses of water hyacinth populations to treatments of the dimethylamine formulation of 2,4- dichloro-phenoxy acetic acid (2,4-D -DMA). Experiments investigated 1) the response of water hyacinth to varying exposures of 2,4-D (DMA); 2) the role of water hyacinth density and herbicide interception in treatment effectiveness using 2,4-D (DMA); and 3) the importance of root exposure to obtain control of water hyacinth using 2,4- D (DMA). Results demonstrated the importance of leaf or canopy interception of 2,4-D (DMA) sprays in obtaining control of water hyacinth populations. The critical threshold plant tissue concentration of 2,4-D (DMA) required to elicit maximum mortality (98%) was estimated to be approximately 12 mg 2,4-D per kg water hyacinth tissue (wet weight). Root uptake apparently plays little or no role in the effectiveness of this herbicide for controlling water hyacinth growth. Validation trials illustrated the efficacy of the current model. The model was validated with data from a field operation. This research has provided considerable insight into optimal use of this auxin-type herbicide for control of water hyacinth, a monocotyledon.

Identiferoai:union.ndltd.org:unt.edu/info:ark/67531/metadc332422
Date12 1900
CreatorsClifford, Philip A. (Philip Alan)
ContributorsRodgers, John H., Jr., Vance, B. Dwain, Beitinger, Thomas L., Dickson, Kenneth L., Zimmerman, Earl G., Rossman, J. Robert (James Robert), 1946-
PublisherUniversity of North Texas
Source SetsUniversity of North Texas
LanguageEnglish
Detected LanguageEnglish
TypeThesis or Dissertation
Formatv, 195 leaves: ill., Text
RightsPublic, Clifford, Philip A. (Philip Alan), Copyright, Copyright is held by the author, unless otherwise noted. All rights reserved.

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