New and Emerging Herbicide Tools for Weed Control in Conifer Nurseries
Testing of new herbicides, alone or in combination with currently registered herbicides, is necessary to control weed species without causing damage to tender tree seedlings. In this study, several herbicides were tested for selectivity on seedling conifers during 2011. Trials were conducted at two sites operated by the Weyerhaeuser Company, one at the Aurora Forest Nursery near Aurora, Oregon, and the second at the Mima Forest Nursery, near Olympia, WA. Weed control at Mima exceeded 85% most of the season. At Aurora, all preemergence (PRE) treatments initially provided excellent control, although control with indaziflam had decreased to 71% by August. At Mima, Douglas-fir seedlings were injured by PRE applications of flumioxazin and flumioxazin + pyroxasulfone, and by postemergence (POST) applications of imazamox and fluroxypyr. At Aurora, Douglas-fir seedlings were injured most by fluroxypyr, imazamox and saflufenacil. Western hemlock seedling shoot weight was reduced by indaziflam and fluroxypyr, while imazamox and the split-applications of mesotrione also decreased hemlock shoot height at harvest.
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Author(s): Tim Miller, Ed Peachey
Publication: National Nursery Proceedings - 2013
Event:
Western Forestry and Conservation Nursery Association Meeting
2013 - Olympia, Washington
