Conyza canadensis

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Noun1.Conyza canadensis - common North American weed with linear leaves and small discoid heads of yellowish flowersConyza canadensis - common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron
Conyza, genus Conyza - common American weed or wildflower
weed - any plant that crowds out cultivated plants
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References in periodicals archive ?
Acuron offers broad-spectrum control of more than 70 weeds in corn, including giant ragweed, common ragweed, Palmer amaranth, waterhemp, marestail, kochia, cocklebur, morningglory and Russian thistle.
Control of glyphosate-resistant marestail and hairy fleabane in orchards and vineyards.
Conservation practices were colonized at differing levels with local, nonplanted vegetation that mostly included marestail (Conyza canadensis), redvine (Brunnichia cirrhosa), vetch (Vida sp.), goldenrod (Solidago spp.), giant ragweed (Ambrosia trifida), curly dock (Rumex crispus), dewberry (Rubus trivialis), blackberry (Rubus oklahomus), johnsongrass (Sorghum hakpense), erect poison ivy (Toxicodendron radicans), broomsedge (Andropogon virginicus), honey locust (Gleditsia triacanthos), American elm (Ulmus americana), and sugarberry (Celtis laevigata).
They have also begun studies on a strain of Xanthomonas bacteria found to infect the leaves of common cocklebur, marestail (or horseweed), and other herbicide-resistant threats to southern crops and potential targets for bioherbicide use.--By Jan Suszkiw, ARS.
Overall, weeding is a fine balance between spraying perennials (such as marestail, rosebay willowherb, docks), hoeing annual weeds and flame-throwing the gravel.
7, 2004), available at (emphasis added) (adding that, even after the five-year mark, the rapid rise of glysophate-resistant marestail triggered, in 2004, "an estimated 10 percent increase in the average pounds of herbicides applied per acre").