Section 5
Chapter 4,904

Chain saw girdling for tree control with garlon and tordon herbicides

Geyer, W.A.; Melichar, M.W.

Down to Earth 37(3): 24-27


ISSN/ISBN: 0012-5792
Accession: 004903949

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Effectiveness of Garlon 3A and Garlon 4P used alone or in combination with Tordon 22K Weed Killer was compared to Tordon 101R Forestry Herbicide when applied to a chainsaw girdle in early winter and spring tests. The predominant species evaluated were black walnut [Juglans nigra], elm [Ulmus spp.] and honeylocust [Gleditsia triacanthos]. Two years after application, all treatments gave excellent control (94-100%) of elm regardless of application timing. Control of honeylocust was less (84-100%) with all herbicides, and only slight differences were noted between winter and spring applications. Resprouting was greater following treatments of Garlon than with the treatments containing Tordon. Control of black walnut ranged from 77 to 100%, with spring applications being superior. This species resprouted from all herbicide treatments and was less susceptible than the other species to Tordon.

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