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  • noun

Synonyms for horseweed

erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers

common North American weed with linear leaves and small discoid heads of yellowish flowers

References in periodicals archive ?
The species with higher infestation in the area were common sow thistle (Sonchus oleraceus), horseweed (Conyza spp) and 'maria-mole' (Senecio brasiliensis) and because of that they were used in the study.
Ground cover included plains bristlegrass, Setaria macrostachya (Poaceae), peppergrass, prickly Russian thistle, Coulter's horseweed, golden crownbeard, hairyseed bahia, Bahia absinthifolia (Asteraceae), burroweed, Isocoma tenuisecta (Asteraceae), silverleafnightshade, copper globemallow, and trailing windmills.
Glyphosate-resistant horseweed in a raisin vineyard near Parlier, left, and glyphosate-resistant ryegrass in a walnut orchard near Davis.
Weedy forbs, particularly the native biennial horseweed (Conyza canadensis), dominated plots in Jul.
Below Memphis, Queen Anne's lace blooms, wild lettuce and horseweed, too.
By 2002, crops like pigweed, ragweed and horseweed developed herbicide tolerance as well.
For some glyphosate-resistant weeds like Palmer amaranth (Amaranthuspalmeri) and horseweed (Conyza canadensis), estimates indicate that these weeds are present in upwards of 2 million acres and locations where glyphosate-resistant weeds occur are also growing at an increasing rate (National Research Council, 2010).
Horseweed, greater and common ragweed and Johnson grass also have also evolved strong glysophate resistance.
Wet-black, thick whip cleaving creek-side grass and horseweed in
UC scientists find herbicide-resistant horseweed in California.
Resistance to Round-up is increasing: goosegrass in Malaysia, Italian ryegrass, Australian ryegrass, horseweed in US.
Midwest: Beechnuts, hickory nuts, wild crabapples, poison ivy, witch hazel, horseweed, greenbrier