How to Kill Poa Annua Weed

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    • 1). Kill poa before it emerges by applying a chemical herbicide to the site. Some types available for the home gardener in nurseries or the garden section of hardware stores include benefin, bensulide and dithiopyr. Follow the herbicide manufacturer's label to determine amounts necessary and the application procedure.

    • 2). Apply an herbicide such as glyphosate to bluegrass that has already emerged, following the manufacturer's label for instructions on application.

    • 3). Cover established poa with a tarp so the plant will not receive sunlight.

    • 4). Water turfgrass that poa has invaded infrequently to kill off the poa. Wait to water until the turfgrass shows signs of stress, such as wilting.

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