Ambrosia artemisiifolia

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  Ambrosia artemisiifolia

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  Ambrosia artemisiifolia

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  Ambrosia artemisiifolia

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  Ambrosia artemisiifolia

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  Ambrosia artemisiifolia inflorescence

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  Ambrosia artemisiifolia male flowers

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  Ambrosia artemisiifolia female flowers

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  Ambrosia artemisiifolia

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  Ambrosia artemisiifolia

Ambrosia artemisiifolia

Ambrosia artemisiifolia, commonly known as common ragweed, is a species of flowering plant in the Asteraceae family. It is native to North America but has spread to many other regions, becoming an invasive species in some areas. This plant is well-known for its role in causing seasonal allergic rhinitis, commonly referred to as hay fever.

Description

Ambrosia artemisiifolia is an annual herbaceous plant that typically grows to a height of 1 to 1.5 meters. The stems are erect, branched, and covered with fine hairs. The leaves are opposite, deeply lobed, and have a fern-like appearance. The plant produces small, inconspicuous green flowers that are wind-pollinated.

Distribution and Habitat

Originally native to North America, Ambrosia artemisiifolia has spread to many parts of the world, including Europe, Asia, and Australia. It thrives in disturbed soils and is commonly found in agricultural fields, roadsides, and urban areas. The plant prefers full sun and can grow in a variety of soil types.

Ecological Impact

As an invasive species, Ambrosia artemisiifolia can outcompete native vegetation, leading to reduced biodiversity. Its ability to produce large quantities of pollen also contributes to its success in new environments. The plant's pollen is a major cause of allergic rhinitis in humans, affecting millions of people worldwide.

Allergenic Properties

The pollen of Ambrosia artemisiifolia is highly allergenic and is a significant contributor to seasonal allergies. The plant releases pollen from late summer to early fall, coinciding with the peak of hay fever season. Symptoms of exposure include sneezing, runny nose, itchy eyes, and asthma exacerbations.

Control and Management

Controlling Ambrosia artemisiifolia involves a combination of mechanical, chemical, and biological methods. Mechanical control includes mowing and hand-pulling before the plant sets seed. Chemical control involves the use of herbicides, while biological control is being researched, including the use of natural predators and pathogens.

Related Pages

• Asteraceae
• Allergic rhinitis
• Invasive species
• Hay fever