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Plantation Establishment in the Boreal Forest: Glyphosate, Hexazinone, and Manual Weed Control

Publication: The Forestry Chronicle
October 1984

Abstract

One manual and two chemical (mist-blown foliar spray of glyphosate and hexazinone) methods of vegetation control were applied in two 17.1 m × 17.1 m plots per treatment in a 1969 boreal cutover in Forest Section B7 where natural jack pine (Pinus banksiana Lamb.) regeneration, mostly about 1 m tall, was overtopped by post-harvest deciduous growth, including sapling aspen (Populus tremuloides Michx.). Season of application(fall = September 1976; summer = July 1977) and, for the chemical treatments, rate of application (0. 1, 2, and 4 kg ai/ha) were evaluated for their effect on (a) deciduous competition, (b) natural jack pine regeneration, and (c) white spruce (picea glauca [Moench] Voss) outplanted as bare-root 2 + 2 stock in June 1978. Annual or more frequent assessments were made through 1983. With (a), manual treatment was more effective in summer than in fall but did not effect sustained control. Of the fall-applied herbicide treatments, only glyphosate at 2 and 4 kg ai/ha was efficacious. Sustained control over several years was obtained with summer-applied glyphosate and, to a lesser degree, hexazinone. With (b), jack pine was not benefited by any treatment. With (c), frost and browsing obscured treatment effects, but the "best" control of deciduous vegetation was probably silviculturally detrimental to the spruce.

Résumé

On a utilisé une méthode manuelle et deux méthodes chimiques (nébulisation de glyphosate et d'hexazinone sur le feuillage) pour limiter la végétation indésirable dans deux parcelles de 17.1 sur 17.1 m par traitement dans une coupe de forêt de type boréal dans la Section B7 où le pin gris (Pinus banksiana Lamb.) régénéré naturellement atteignait en moyenne environ 1 m et était caché par des feuillus qui avaient poussé après la récolte, notamment du peuplier faux-tremble (Populus tremuloides Michx). On a évalué les saisons d'application (automne = septembre 1976, été = juillet 1977) et, pour les traitements chimiques, la concentration de l'épandage (0, 1, 2 et 4 kg de matières actives par hectare) en fonction de leurs effets sur (a) la concurrence des feuillus, (b) la régénération naturelle du pin gris, et (c) l'épinette blanche (Picea glauca [Moench] Voss) transplantée comme matériel 2 + 2 à racines nues en juin 1978. Jusqu'en 1983, on a fait des évaluations annuelles ou plus fréquentes. En (a), le traitement manuel a été plus efficace à l'été qu'a l'automne mais il n'a pas permis d'obtenir une limitation durable. Des herbicides nébulisés à l'automne, seul le glyphosate applique a raison de 2 et de 4 kg de matières actives par hectare, a été efficace. On a obtenue une limitation durable sur plusieurs années par application de glyphosate l'été et, dans une moindre mesure, d'hexazinone. En (b). aucun traitement ne s'est avéré avantageux au pin gris. En (c), le gel et le broutement ont masque les effets des traitements, mais le meilleur contrôle de la végétation de feuillus a probablement été nuisible à l'épinette.

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cover image The Forestry Chronicle
The Forestry Chronicle
Volume 60Number 5October 1984
Pages: 283 - 287

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Version of record online: 21 March 2011

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1. Mechanical Site Preparation and Early Chemical Tending in White Spruce: 19-year Results

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