Abstract
Teucrium canadense L. var. canadense, commonly known as germander, was identified as a major weed problem of corn and soybeans growing in lowland areas in southwestern Ontario. Field experiments with postemergence herbicides showed that growth of shoots from established plants and regrowth of new sprouts from rhizomes was effectively controlled by applications of glyphosate at 1.12, 1.68 and 2.24 kg/ha when applied in August and September. Postemergence applications of 2,4-D + dicamba + mecoprop applied at 0.68 + 0.25 + 0.19 and 1.36 + 0.51 + 0.37 kg/ha or dicamba at 0.56 and 1.0 kg/ha applied at the sprout to prebloom stage of growth resulted in 75–88% control of shoot growth and 3–16% control of regrowth. Linuron, bentazon and amitrole gave 57–77% control of shoot growth. Control with herbicides was depended upon proper herbicide selection, rate of active ingredient used and growth stage of the weed at time of herbicide application.Key words: Teucrium canadense L. var. canadense, herbicides, control
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