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Evaluation of Chemical and Physical Control Methods for the Control of Giant Hogweed (Heracleum mantegazzianum Sommier & Levier)

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Title: Evaluation of Chemical and Physical Control Methods for the Control of Giant Hogweed (Heracleum mantegazzianum Sommier & Levier)
Author: Grguric, Meghan
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: Tardif, François
Abstract: The invasiveness and potential health effects of giant hogweed warrant the evaluation of improved chemical and physical methods for the management of this weed. Herbicides were applied as either a broadcast spray or as a stem injection. Broadcast application of aminopyralid/metsulfuron-methyl, aminopyralid/metsulfuron-methyl+fluroxypyr-meptyl, triclopyr and picloram controlled giant hogweed as effectively as the standard treatments glyphosate and aminocyclopyrachlor/chlorsulfuron and reduced seedling recruitment. Injection of triclopyr, aminocyclopyrachlor/chlorsulfuron and aminopyralid/metsulfuron-methyl were less effective than glyphosate at visible injuring seed. Cuttings of giant hogweed flowering stems was done at different stages and frequencies. Cutting during seed set prevented regeneration from occurring. Shoot removal before or at flowering allowed regeneration, demanding extra cuttings. Seed production from regenerated shoots was only 2% or less that of untreated plants. Best practices for giant hogweed management should include an early spring broadcast application followed by herbicide injection or stem cutting in late spring or early summer when flowering.
URI: http://hdl.handle.net/10214/13058
Date: 2018-05-18


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