Occurrence of glyphosate-resistant horseweed
(Conyza canadensis) population in China.
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.
in a raisin vineyard near Parlier, left, and glyphosate-resistant ryegrass in a walnut orchard near Davis.
seeds were accessed from orchards in Pretoria.
Weedy forbs, particularly the native biennial horseweed
(Conyza canadensis), dominated plots in Jul.
Response of horseweed
biotypes to foliar applications of cloransulam-methyl and glyphosate.
Below Memphis, Queen Anne's lace blooms, wild lettuce and horseweed
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).
, greater and common ragweed and Johnson grass also have also evolved strong glysophate resistance.
Wet-black, thick whip cleaving creek-side grass and horseweed
UC scientists find herbicide-resistant horseweed
Resistance to Round-up is increasing: goosegrass in Malaysia, Italian ryegrass, Australian ryegrass, horseweed
Midwest: Beechnuts, hickory nuts, wild crabapples, poison ivy, witch hazel, horseweed