Abstract
Abstract Glyphosate [(N-phosphonomethyl) glycine] at rates of 0.0, 2.2, 3.4, and 4.5 kg/ha were applied to nursery plots that were severely infested with Canada thistle [Cirsium arvense (L.) Scop.]. The plots contained Pfitzer juniper (Juniperus chinensis L. ‘Pfitzeriana’), Hetz Juniper (Juniperus chinesis L. ‘Hetzii’), Japanese Garden Juniper (Juniperus chinesis L. ‘Procumbens’), and Tamarix Juniper (Juniperus sabina L. ‘Tamariscifolia’). Glyphosate was applied as an overspray including the junipers on September 2, 1976. Two weeks after treatment, all thistles in the 4.5 kg/ha plots were dead, while those in the 2.2 kg/ha and 3.4 kg/ha showed extreme chlorosis. Canada thistle root cuttings taken 4 days after treatment did not survive when placed in a mist bench. Good to excellent weed control was obtained with no evident phytotoxicity to the junipers.
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