Biology and Management of Barnyardgrass |
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CONTENTS |
Barnyardgrass is a summer annual native to Europoe and India. Vigorous and numerous stems 1 to 5 feet tall with stem bases often red or purple. Flat, wide leaves without a ligule. Panicles are often red or purple. Single plants can produce up to 7,000 seeds. It prefers wet soils and warm temperatures. These conditions are provided in the summer-irrigated mint fields of the United States. Because barnyardgrass germinated throughout the summer, and because plants can produce new branches and tillers through the season, it is a particularly serious weed in poor or open mint stands. Impact on Yield: A barnyardgrass infestation of 32 plants per square foot reduced peppermint oil yield by 37% (Ian Heap). When both green foxtail and barnyardgrass were present, the peppermint oil yield was suppressed by as much as 32 lbs per acre (Ian Heap). Herbicide Control Notes:
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