An agricultural survey compared 24 weeds commonly found in crop fields. The table shows each weed’s growth type, potential impact on crop yield, persistence of its seeds in the soil, and tolerance to a standard herbicide treatment. Weed Growth type Crop impact^a Seed-bank persistence^b Herbicide tolerance^c Alderweed annual high long low Blueleaf annual moderate moderate low Coppergrass perennial grass high long moderate Dune thistle perennial broadleaf high long high Ember sedge sedge moderate moderate moderate Fieldstar annual high moderate low Golden reed sedge high long high Harborgrass perennial grass high moderate low Ironleaf perennial broadleaf moderate long moderate Juniper weed annual low short low Knotgrass perennial grass high long high Lantern sedge sedge high long moderate Meadowbane perennial broadleaf high moderate low Nightweed annual moderate long moderate Orchard grass perennial grass moderate moderate low Prairie sedge sedge high long high Quickleaf annual high long moderate River thorn perennial broadleaf moderate short low Stonegrass perennial grass high long moderate Timber weed annual moderate moderate low Umbra sedge sedge low moderate low Valley vine perennial broadleaf high long high Willow grass perennial grass moderate short low Yellowleaf annual high moderate low ^a Crop impact: Expected effect on crop yield if the weed is left unmanaged. ^b Seed-bank persistence: Short = less than 1 year, Moderate = 1 to 3 years, Long = greater than 3 years. ^c Herbicide tolerance at the standard dose: Low = at least 90% control after one application, Moderate = at least 90% control only after repeated application, High = less than 90% control even after repeated application. For each of the following statements, select Yes if the statement is supported by the information in the table and its legend. Otherwise, select No .

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An agricultural survey compared 24 weeds commonly found in crop fields

Bunuel

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09 Sep 2026, 04:32

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More than half of the weeds with high crop impact have seeds that can persist in the soil for more than 3 years.: Yes Every sedge with at least moderate herbicide tolerance has long seed-bank persistence.: No A single standard herbicide application is expected to control at least 90% of exactly twice as many annual weeds as perennial grasses.: Yes

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An agricultural survey compared 24 weeds commonly found in crop fields. The table shows each weed’s growth type, potential impact on crop yield, persistence of its seeds in the soil, and tolerance to a standard herbicide treatment.

Weed	Growth type	Crop impact^a	Seed-bank persistence^b	Herbicide tolerance^c
Alderweed	annual	high	long	low
Blueleaf	annual	moderate	moderate	low
Coppergrass	perennial grass	high	long	moderate
Dune thistle	perennial broadleaf	high	long	high
Ember sedge	sedge	moderate	moderate	moderate
Fieldstar	annual	high	moderate	low
Golden reed	sedge	high	long	high
Harborgrass	perennial grass	high	moderate	low
Ironleaf	perennial broadleaf	moderate	long	moderate
Juniper weed	annual	low	short	low
Knotgrass	perennial grass	high	long	high
Lantern sedge	sedge	high	long	moderate
Meadowbane	perennial broadleaf	high	moderate	low
Nightweed	annual	moderate	long	moderate
Orchard grass	perennial grass	moderate	moderate	low
Prairie sedge	sedge	high	long	high
Quickleaf	annual	high	long	moderate
River thorn	perennial broadleaf	moderate	short	low
Stonegrass	perennial grass	high	long	moderate
Timber weed	annual	moderate	moderate	low
Umbra sedge	sedge	low	moderate	low
Valley vine	perennial broadleaf	high	long	high
Willow grass	perennial grass	moderate	short	low
Yellowleaf	annual	high	moderate	low

^a Crop impact: Expected effect on crop yield if the weed is left unmanaged.

^b Seed-bank persistence: Short = less than 1 year, Moderate = 1 to 3 years, Long = greater than 3 years.

^c Herbicide tolerance at the standard dose: Low = at least 90% control after one application, Moderate = at least 90% control only after repeated application, High = less than 90% control even after repeated application.

For each of the following statements, select Yes if the statement is supported by the information in the table and its legend. Otherwise, select No.

Yes	No
		More than half of the weeds with high crop impact have seeds that can persist in the soil for more than 3 years.
		Every sedge with at least moderate herbicide tolerance has long seed-bank persistence.
		A single standard herbicide application is expected to control at least 90% of exactly twice as many annual weeds as perennial grasses.