|Scientific Name||Ambrosia artemisiifolia L.|
|Common Names||English: Common Ragweed, short ragweed; German: Beifußblättrige Ambrosie; French: Ambroise élevée, ambroisie à feuilles d'armoise|
|Description||Annual seed-propagated weed with a taproot. Often appears in large numbers.|
Cotyledons with purple underside. Fruit is an achene resembling a queen's crown; much divided leaves.
Cotyledons broad, club-shaped.
Apex rounded, narrowing toward petiole.
Hairs spread apart at the top, heavily ramified, 30-100 cm (11.81 - 39.37 inch) high.
Lower leaves with irregular, lanceolate to ovate pointed lobes, upper leaves ovate in outline, dipinnate with two to three oblong-lanceolate, dentate to pinnatifid-lobed sections, sometimes alternate.
Yellowish-white, male flowers form terminal dense clusters, female flowers less numerous in the axils of the upper leaves.
Late summer - autumn.
Nutlets beaked, up to 0,6 cm (0.24 inch) long, brown, with short, sharp spines.
Germination in spring. Seeds are enclosed in a hard bur.
Viability Of Seeds
Very persistent in soil seed bank.
By seed. 3,000 - 60,000 seeds/plant.
Cultivated fields, fallow fields, roadsides, disturbed areas.
A. artemisiifolia prefers warm, somewhat dry locations with nutrient-rich soils.
Additional Crop Information
Also in soybeans and sunflower.
Common ragweed is an invader of old fields during secondary succession and can be a serious problem in individual fields, where it is difficult to control.
The pollen is very allergenic and causes hay feaver and asthma; therefore eradication programs were started in Europe and the USA.
Integrated Crop Management
Control of common ragweed with tillage or row cultivation is effective in controlling small seedlings. Also frequent mowing may reduce the weed stand.
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