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Director of Science Policy Update

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2017 Results for the U.S. & Canada(202 survey responses)Most Common and Troublesome Weeds inGrass Crops, Pasture & Turf
1) corn, 2) pastures, rangeland, or other hay, 3) rice, 4) sorghum, 5) spring cereal grains, 6) turf, and 7) winter cereal grains
Common weedsrefer to those weeds you most frequently see.Troublesome weedsare those that are most difficult to control, but may not be widespread.
WSSA’s Composite List of Weeds is used for weed common and latin nameshttp://wssa.net/wssa/weed/composite-list-of-weeds/
Suggested citation: VanWychenL (2017) 2017 Survey of the Most Common and Troublesome Weeds in Grass Crops, Pasture and Turf in the United States and Canada. Weed Science Society of America National Weed Survey Dataset. Available: http://wssa.net/wp-content/uploads/2017-Weed-Survey_Grass-crops.xlsx
Top 6 Weeds in Corn(50 survey respondents)
MOSTCOMMON
MOSTTROUBLESOME
* number of survey respondents who listed the weed species as one of their top 5 weeds in this crop.- foxtail spp. included giant, green and yellow foxtail.morningglory spp. included ivyleaf morningglory.pigweed spp. included redroot and smooth pigweed and Powell amaranth.
Top 5 Weeds in Pasture, Rangeland, other Hay(39 survey respondents)
MOSTCOMMON
MOSTTROUBLESOME
* number of survey respondents who listed the weed species as one of their top 5 weeds in this crop.Bromus spp. included downy, smooth, and Japanese brome.sandbur spp. included field sandbur.knapweed spp. included spotted, Russian, and diffuse knapweed.
Top 4 Weeds in Rice(10 survey respondents)
MOSTCOMMON
MOSTTROUBLESOME
* number of survey respondents who listed the weed species as one of their top 5 weeds in this crop.- Echinochloa spp. included barnyardgrass, junglerice and late watergrass.Cyperus spp. included rice flatsedge, yellow nutsedge and smallflower umbrella sedge.sprangletop spp. included Amazon, bearded and Nealley’s sprangletop.
Top 5 Weeds in Sorghum(14 survey respondents)
MOSTCOMMON
MOSTTROUBLESOME
* number of survey respondents who listed the weed species as one of their top 5 weeds in this crop.- crabgrass spp. included large crabgrass.- Urochloa spp. included broadleaf signalgrass and Texas and browntop millet.morningglory spp. included ivyleaf and pitted morningglory.
Top 5 Weeds in Spring Cereal Grains(20 survey respondents)
MOSTCOMMON
MOSTTROUBLESOME
* number of survey respondents who listed the weed species as one of their top 5 weeds in this crop.- mustard spp. included rapeseed (volunteer canola), wild mustard, wild radish and shepherd’s-purse.- foxtail spp. included green foxtail.Galium spp. included catchweed bedstraw (cleavers) and false cleavers.
Top 5 Weeds in Turf(28 survey respondents)
MOSTCOMMON
MOSTTROUBLESOME
* number of survey respondents who listed the weed species as one of their top 5 weeds in this crop.crabgrass spp. included large, smooth and southern crabgrass.Paspalum spp. Included dallisgrass, field paspalum and bahiagrass.- clover spp. included white clover.nutsedge spp. included yellow and purple nutsedge.
MOSTCOMMON
MOSTTROUBLESOME
Top 5 Weeds in Winter Cereal Grains(41 survey respondents)
* number of survey respondents who listed the weed species as one of their top 5 weeds in this crop.mustard spp. included flixweed, shepherd’s-purse, field pennycress, wild radish, blue, wild, and tumble mustard, and pinnate tansymustard.Lamium spp. included henbit and purple deadnettle.Bromus spp. included downy, smooth and Japanese brome, and cheat.
Top 10 MostCommonWeeds among allGrass Crops, Pasture, & Turf(202 total survey respondents)
MOSTCOMMON
* number of survey respondents who listed the weed species as one of their top 5 weeds.crabgrass spp. included large, smooth and southern crabgrass.mustard spp. included shepherd’s-purse, flixweed, rapeseed (volunteer canola), wild radish, field pennycress, wild, blue, and tumble mustard, pinnate tansymustard, and yellow and London rocket.foxtail spp. included green, giant, and yellow foxtail.Bromus spp. included downy, smooth, and Japanese brome, cheat, and rescuegrass.Lamium spp. included henbit and purple deadnettle.morningglory spp. included ivyleaf and pitted morningglory.
Top 10 MostTroublesomeWeeds among all Grass Crops, Pasture, & Turf(202 total survey respondents)
MOSTTROUBLESOME
* number of survey respondents who listed the weed species as one of their top 5 weeds.Bromus spp. included downy, smooth, and Japanese brome, cheat, and rescuegrass.morningglory spp. included ivyleaf, pitted, and tall morningglory.foxtail spp. included green, giant, and yellow foxtail.nutsedge spp. included yellow and purple nutsedge.

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Director of Science Policy Update