Troublesome Weeds in North American Crops Survey
Explore the top common and troublesome weeds in broadleaf crops, fruits, and vegetables in the United States and Canada based on survey responses. Learn about the most challenging weeds within various crop types and regions. Access the full dataset for comprehensive insights.
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2019 Results for the U.S. & Canada (166 survey responses) Most Common and Troublesome Weeds in Broadleaf Crops, Fruits & Vegetables 1) alfalfa, 2) canola, 3) cotton, 4) fruits & nuts, 5) peanut, 6) pulse crops, 7) soybean, 8) sugarbeets, 9) vegetables- cole crops, greens 10) vegetables- cucurbits, 11) vegetables- fruiting, and 12) vegetables- other Common weeds refer to those weeds you most frequently see. Troublesome weeds are 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 names http://wssa.net/wssa/weed/composite-list-of-weeds/ Suggested citation: Van Wychen L (2019) 2019 Survey of the Most Common and Troublesome Weeds in Broadleaf Crops, Fruits & Vegetables in the United States and Canada. Weed Science Society of America National Weed Survey Dataset. Available: http://wssa.net/wp-content/uploads/2019-Weed-Survey_Broadleaf-crops.xlsx
Top 5 Weeds in Alfalfa (32 survey respondents) MOST COMMON MOST TROUBLESOME 1 pigweed (19)* 2 Canada thistle (13) 3 Bromus spp. (11) 4 dandelion (9) 4 mustard spp. (9) 1 2 3 4 4 pigweed spp. (19)* mustard spp. (15) Bromus spp. (10) kochia (9) dandelion (9) * number of survey respondents who listed the weed species as one of their top 5 weeds in this crop. - pigweed spp. included redroot pigweed, spiny pigweed, waterhemp, and Palmer amaranth. mustard spp. included shepherd s-purse, flixweed, tansymustard spp., yellow rocket, and white mustard. Bromus spp. included downy brome (cheatgrass) and cheat. - -
Top 5 Weeds in Canola (19 survey respondents) MOST COMMON MOST TROUBLESOME 1 wild oat (15)* 2 kochia (13) 3 Galium spp. (12) 4 wild buckwheat (6) 1 2 2 4 5 wild oat (15)* kochia (12) Galium spp. (12) wild buckwheat (8) green foxtail (5) * number of survey respondents who listed the weed species as one of their top 5 weeds in this crop. - Galium spp. included catchweed bedstraw (cleavers) and false cleavers.
Top 5 Weeds in Cotton (23 survey respondents) MOST COMMON MOST TROUBLESOME 1 2 3 4 Palmer amaranth (23)* morningglory spp. (20) horseweed (marestail) (10) tie of four species (6 each) 1 2 3 4 5 Palmer amaranth (23)* morningglory spp. (20) Urochloa spp. (9) crabgrass spp. (7) barnyardgrass (7) * number of survey respondents who listed the weed species as one of their top 5 weeds in this crop. - morningglory spp. included ivyleaf and pitted morningglory. - Urochloa spp. included broadleaf signalgrass and Texas and browntop millet. - crabgrass spp. included large crabgrass. - Tie included: barnyardgrass, goosegrass, nutsedge spp., and kochia.
Top 4 Weeds in Fruits & Nuts (23 survey respondents) MOST COMMON MOST TROUBLESOME 1 2 2 3 3 nutsedge spp. (9)* poison-ivy spp. (8) Canada thistle (8) Erigeron spp. (7) bindweed spp. (7) 1 1 3 4 Erigeron spp. (7)* nutsedge spp. (7) ragweed spp. (6) Canada thistle (4) * number of survey respondents who listed the weed species as one of their top 5 weeds in this crop. - - - - Erigeron spp. included horseweed (marestail) and hairy fleabane. Nutsedge spp. included yellow and purple nutsedge. ragweed spp. included giant and common ragweed. bindweed spp. included field and hedge bindweed.
Top 3 Weeds in Peanuts (6 survey respondents) MOST COMMON MOST TROUBLESOME 1 2 2 Palmer amaranth (6)* nutsedge spp. (3) sicklepod (3) 1 2 2 nutsedge spp. (5)* Palmer amaranth (4) Urochloa spp. (4) * number of survey respondents who listed the weed species as one of their top 5 weeds in this crop. - - nutsedge spp. included yellow and purple nutsedge. Urochloa spp. included broadleaf signalgrass and Texas and browntop millet.
Top 5 Weeds in Pulse Crops (24 survey respondents) MOST COMMON MOST TROUBLESOME 1 2 3 4 kochia (19)* Canada thistle (11) pigweed spp. (9) Galium spp. (7) 1 2 3 3 5 kochia (18)* wild oat (12) common lambsquarters (10) pigweed spp. (10) Canada thistle (8) * number of survey respondents who listed the weed species as one of their top 5 weeds in this crop. - pigweed spp. included redroot pigweed and Powell amaranth. - Galium spp. included catchweed bedstraw (cleavers) and false cleavers.
Top 7 Weeds in Soybean (75 survey respondents) MOST COMMON MOST TROUBLESOME 1 2 3 4 4 6 7 waterhemp (49)* horseweed (marestail) (48) Palmer amaranth (40) giant ragweed (25) morningglory spp. (22) common lambsquarters (22) common ragweed (21) 1 2 3 3 5 6 7 waterhemp (39)* horseweed (marestail) (37) common lambsquarters (36) foxtail spp. (36) Palmer amaranth (26) common ragweed (25) velvetleaf (19) * 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, pitted, and tall morningglory.
Top 4 Weeds in Sugarbeets (14 survey respondents) MOST COMMON MOST TROUBLESOME 1 2 3 4 common lambsquarters (14) kochia (11) redroot pigweed (7) common waterhemp (7) 1 2 3 4 common lambsquarters (13)* redroot pigweed (12) kochia (10) waterhemp (5) * number of survey respondents who listed the weed species as one of their top 5 weeds in this crop. - pigweed spp. included redroot pigweed and waterhemp.
Top 3 Weeds in Vegetables- Cole Crops, Greens (13 survey respondents) MOST COMMON MOST TROUBLESOME 1 1 3 3 common lambsquarters (8)* nutsedge spp. (8) ragweed spp. (4) pigweed spp. (4) 1 2 3 common lambsquarters (10)* pigweed spp. (7) purslane spp. (5) * number of survey respondents who listed the weed species as one of their top 5 weeds in this crop. - pigweed spp. included redroot pigweed and Powell amaranth. - purslane spp. included pink and common purslane. - nutsedge spp. included yellow and purple nutsedge. - ragweed spp. included giant and common ragweed.
Top 4 Weeds in Vegetables- Cucurbits (17 survey respondents) MOST COMMON MOST TROUBLESOME 1 1 3 4 pigweed spp. (12)* nutsedge spp. (12) purslane spp. (8) morningglory spp. (6) 1 2 3 4 pigweed spp. (13)* nutsedge spp. (8) Common lambsquarters (7) crabgrass spp. (6) * number of survey respondents who listed the weed species as one of their top 5 weeds in this crop. - pigweed spp. included redroot pigweed, smooth pigweed, Powell amaranth, and Palmer amaranth. - nutsedge spp. included yellow and purple nutsedge. - crabgrass spp. included large and southern crabgrass. - purslane spp. included common and pink purslane. - morningglory spp. included tall, ivyleaf, and pitted morningglory.
Top 4 Weeds in Vegetables- Fruiting (14 survey respondents) MOST COMMON MOST TROUBLESOME 1 2 2 4 nutsedge spp. (9)* nightshade spp. (8) pigweed spp. (8) purslane spp. (6) 1 2 3 3 pigweed spp. (12)* nutsedge spp. (7) common lambsquarters (6) purslane spp. (6) * number of survey respondents who listed the weed species as one of their top 5 weeds in this crop. - pigweed spp. included redroot, prostrate, and smooth pigweed and Palmer amaranth. - nutsedge spp. included yellow and purple nutsedge. - purslane spp. included pink and common purslane. - nightshade spp. included horsenettle, eastern black, American black, and hairy nightshade.
Top 4 Weeds in Vegetables- Other (15 survey respondents) MOST COMMON MOST TROUBLESOME 1 2 2 4 pigweed spp. (8)* nutsedge spp. (6) nightshade spp. (6) common lambsquarters (5) 1 2 3 4 pigweed spp. (12)* common lambsquarters (10) purslane spp. (5) crabgrass spp. (4) * number of survey respondents who listed the weed species as one of their top 5 weeds in this crop. - pigweed spp. included redroot, smooth, and prostrate pigweed, Palmer amaranth, and waterhemp. - purslane spp. included pink and common purslane. - crabgrass spp. included large and smooth crabgrass. - nutsedge spp. included yellow and purple nutsedge. - nightshade spp. included horsenettle, hairy and eastern black nightshade.
Top 10 Most Common Weeds among all Broadleaf Crops, Fruits, and Vegetables (166 total survey respondents) MOST COMMON 1 2 3 3 5 6 7 8 8 Palmer amaranth (91)* kochia (73) nutsedge spp. (71) common lambsquarters (71) horseweed (marestail) (70) waterhemp (67) pigweed spp. (55) morningglory spp. (50) Canada thistle (50) 10 Common ragweed (38) * number of survey respondents who listed the weed species as one of their top 5 weeds. - nutsedge spp. included yellow and purple nutsedge. - pigweed spp. included redroot and smooth pigweed and Powell and spiny amaranth. - morningglory spp. included ivyleaf, pitted, and tall morningglory.
Top 10 Most Troublesome Weeds among all Broadleaf Crops, Fruits, and Vegetables (166 total survey respondents) MOST TROUBLESOME 1 2 3 3 5 6 7 8 8 Palmer amaranth (91)* kochia (73) common lambsquarters (71) nutsedge spp. (71) horseweed (marestail) (70) waterhemp (67) pigweed spp. (55) Canada thistle (50) morningglory spp. (50) 10 common ragweed (38) * number of survey respondents who listed the weed species as one of their top 5 weeds. - nutsedge spp. included yellow and purple nutsedge - pigweed spp. included redroot and smooth pigweed and Powell and spiny amaranth. - morningglory spp. included ivyleaf, pitted, and tall morningglory.
