Sign In  |  Register  |  Make this my homepage  |  Syngenta Global  |
FarmAssist
Email Page | Print Page | New Search | Back To Search Results
Ragweed, common Photo Identification

Previous Next
  • Pest Type: Weed
  • Crops Affected: Wheat, Cereals
  • Scientific Name: Ambrosia astemisiifolia L. var. elatior (L.) Descourtils
Description
The plant has a shallow-rooted taproot. Stems stand erect, multi-branched and may be hairless or hairy. Leaves are hairy to nearly smooth, mostly alternate and are deeply cut into many lobes. Plant grows up to 6 ft tall and emits strong odor when crushed.

Propagation
Annual. Seed.

Seedling
Opposite first leaves with stems. Cotyledons are spatula-shaped with purple spots on margin.

Mature Plant
Stems erect, branched, bushy, 1/2 to 5 feet tall at maturity. Hairless to hairy.



Leaves opposite at bottom of plant, becoming alternate above. Ovate but deeply divided with coarse, toothed edges. Bright green to yellow-green on young plants. Older plants with gray-green leaves. Smooth upper leaves, hairy to hairless underneath. Stalks short.



Underground Parts
Taproot.

Habitat
Pastures, cultivated fields and waste areas.

Distribution
Nationwide

Similar Species
Giant ragweed



FarmAssist.com is your source for ag news and information on crop pest identification, commodity and market prices, agricultural news & issues, and access to crop production management tools such as crop yield & planting calculators and herbicide, fungicide, and weed control information.