Abstract
Glyphosate [N-(phosphonomethyl)glycine] was applied at four rates, 0.4, 0.8, 1.5 and 3.0 kg ai/ha (0.36, 0.71, 1.34 and 2.7 lb ai/A) each at four dates, May 26, July 14, September 10, and October 27, 1982, over Fraser fir (Abies fraseri (Pursh) Poir.), Norway spruce (Picea abies (L.) Karst.), and Canadian hemlock (Tsuga canadensis (L.) Carriere). Plants were treated in 1982 and evaluated in 1983 and 1984. Plant height best described the treatment effects for hemlock and fir. Plant height plus budset on the terminal best described treatment effects for spruce. Fir and spruce were tolerant to September and October applications of glyphosate, however, May and July treatments resulted in significant phytotoxicity. Hernlock plants were injured by May, July and September glyphosate treatments, but not bv similar applications in October. Injury to all species persisted into the 1984 season from single applications in 1982.
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