Crop Protection Online > Pests - Weed biology<br> <sub>Agro-region: Denmark</sub> - Bidens tripartita L.
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15.8 2022 undefined

Weed biology
Agro-region: Denmark

Bidens tripartita L. Previous page Next page

Go to identification key for weeds

Can be mistaken for

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Characteristics

Cotyledons
Oval with entire leaf margins. Stalked. Smooth surface. Length approx. 10 mm.

True leaves
Egg-shaped outline. More or less deeply incised leaf margin. Stalked. The surface is smooth except close to the leaf base (and stalk). Length approx. 12-20 mm.

Mature plant
Trifid Bur-marigold is a medium-sized plant with a 20-60 cm high, erect stem. The plant is especially known by the 2 or 3 distinct, hooked Bristles on the fruit. The diameter of the flower head is approx. 10 mm. Seed production: Up to approx. 300 seeds per plant.

Seed
Compressed, oblong, wedge-shaped with sharp side edges and comb-shaped middle rib(s). The top end has 3 stiff, strong, harpoon-like, up to 3.5 mm long points, of which the middle one often is broken off. The surface is covered with downwards-facing, crystal-clear prickles on the side edges, top points and sometimes the middle rib; otherwise smooth. Thousand grain weight approx. 3.7 g.

Biology

Propagation and dispersal
Only through seeds.

Habit
Summer annual.

Importance

Trifid Bur-marigold is predominantly found on moist to waterlogged soil throughout Denmark. The species is mainly found in open and/or late sown spring crops and can cause severe losses especially in Beet.

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Taxonomy

Compositae.

Names in different languages

Danish : Brøndsel, fliget
German : Dreiteiliger Zweizahn
English : Trifid Bur-marigold
Latin : Bidens tripartita L.
Norwegian : Flikbrønsle
Swedish : Brunskära

Bidens tripartita L.: Seedling
Seedling
Bidens tripartita L.: Early stage
Early stage
Bidens tripartita L.: Flower
Flower
Bidens tripartita L.: Mature plant
Mature plant
Bidens tripartita L.: Seeds
Seeds

 
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