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  • Author or Editor: W.C. Dunwell x
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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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The Southern Extension and Research Activities/Information Exchange Group-27 (SERA/IEG-27) is sponsored by the Southern Association of Agricultural Experiment Station Directors. Thirteen universities and the U.S. National Arboretum cooperate with official representatives from extension and research programs. The objective of the group is to identify, evaluate, select, and disseminate information on superior, environmentally sustainable, landscape plants for nursery crop production and landscape systems in the southeastern U.S. Plants are distributed to members responding to a request from cooperators for plant evaluation. Those who agree to cooperate are expected to grow the selected liner to landscape size, then transplant it in a landscape setting. The plant is rated for insect, disease, and cold damage, heat stress, growth rate, ornamental flowering and fruiting, fall color, commercial production potential, landscape potential, invasiveness potential, and insect disease transmission potential. Growth rate is evaluated annually by recording plant height and width. Initial bloom date is reported followed by bloom duration in days. Following evaluation, the group collectively and individually disseminates information gained from the plant evaluation system to a wide variety of audiences.

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