|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.
Useful non-chemical contribution to Integrated Weed 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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