Seedl~ngs of four conifer species grown in four container systems were field tested on intensively prepared sites. Plots were treated with the herbicides Casoron and Roundup for follow-up weed control Jack pine survived and grew best after two full growing seasons. The Rootrainer container and a plug container bound with an experimental polymer gave consistently good results for all species. Height and diameter growth were best on plots treated with Roundup. Casoron decreased survival slightly. In the initial phase of establishment, use of these herbicides may not be justified, if mechanical site preparation is thorough enough, but this must await further evaluation.Les semis de quatres especes resineux provenant de quatre systemes de contenants furent essay6 sur le terrain sur les sites prepares intensivement. Les parcelles furent traitees avec les herbicides Casoron et Roundup pour le contr6le de la vegetation herbacee. Le pin gris, apres deux saisons completes de croissance, dominait en ce qui concerne la survie et la croissance. Le contenant Rootrainer et un contenant a "plug" fixe avec un polymere experimental ont donne de bons resultats de faGon consistante pour toutes les especes. Les meilleures croissances en hauteur et en diametre furent observees dans les parcelles-echantillon traitbes avec Roundup. Casoron a quelque peu reduit la survie. Lorsque la preparation du site est adequate, il est possible que I'utilisation de ces herbicides soit injustifiee lors de la phase initiale de developpement, toutefois ceci requiert une evaluation plus approfondie.
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