Ambrosia artemisiifolia

Scientific Name Ambrosia artemisiifolia L.
Synonyms Ambrosia elatior
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.

Descriptions

Characteristic Features

Cotyledons with purple underside. Fruit is an achene resembling a queen's crown; much divided leaves.

Cotyledons

Cotyledons broad, club-shaped.
Apex rounded, narrowing toward petiole.

Stems

Hairs spread apart at the top, heavily ramified, 30-100 cm (11.81 - 39.37 inch) high.

Leaves

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.

Propagatio Organs

Flowers

Yellowish-white, male flowers form terminal dense clusters, female flowers less numerous in the axils of the upper leaves.

Flowering Period

Late summer - autumn.

Fruit

Nutlets beaked, up to 0,6 cm (0.24 inch) long, brown, with short, sharp spines.

Seeds

Germination in spring. Seeds are enclosed in a hard bur.

Viability Of Seeds

Very persistent in soil seed bank.

Propagation

By seed. 3,000 - 60,000 seeds/plant.

Occurrence

Habitat

Cultivated fields, fallow fields, roadsides, disturbed areas.

Soil

A. artemisiifolia prefers warm, somewhat dry locations with nutrient-rich soils.

Additional Crop Information

Also in soybeans and sunflower.

Agricultural Importance

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.

Control

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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