Crop Protection Online > Pests - Weed biology<br> <sub>Agro-region: Denmark</sub> - Brassica napus L.

Crop Protection Online

25.4 2024

Weed biology
_{Agro-region: Denmark}

Brassica napus L.

Can be mistaken for

Brassica campestris L, which has hairier true leaves.

Raphanus raphanistrum L., which has densely hairy true leaves.

Sinapis arvensis L., which has densely hairy true leaves.

Characteristics

Cotyledons
Inverted kidney-shaped with entire leaf margins. Stalked. The surface is either smooth or has a few hairs. Length approx. 7-10 mm

True leaves
Inverted egg-shaped with sinuate to toothed leaf margins. Stalked. The surface is either smooth or has a few hairs. Length approx. 20-30 mm.

Mature plant plant
Oil-seed Rape is a vigorous plant with a 60-100 cm high, erect stem. The plant is especially known by its very bluish-green colour. The length of the petals is approx. 10-12 mm. Seed production: Up to approx. 1,500 seeds per plant.

Seed
Ball-shaped. Very finely pitted surface. Thousand grain weight approx. 5.0 g.

Biology

Propagation and dispersal
Only through seeds.

Habit
Summer and winter annual.

Importance

Oil-seed Rape is a frequent volunteer plant in both autumn- and spring-sown crops. In all crops in which it is present as a weed it is an injurious weed, which causes yield losses.

For treatment options, consult 'Herbicides Across'.
For more options, consult 'Main Menu'.

Taxonomy

Cruciferae.

Names in different languages

Danish :	Raps
German :	Raps
English :	Oil-seed Rape
Latin :	Brassica napus L.
Norwegian :	Raps
Swedish :	Raps

Seedling

Early stage

Flower

Mature plant

Seeds

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Weed biology Agro-region: Denmark