Planteværn Online > Skadevoldere - Weed biology<br> <sub>Agro-region: Denmark</sub> - Pineapple-weed
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3.5 2024 undefined

Weed biology
Agro-region: Denmark

Pineapple-weed Previous page Next page

Go to identification key for weeds

Can be mistaken for

Corn Chamomile, of which the first 2 true leaves have several incisions.
Corn Marigold, which has blue-green dicotyledon leaves and true leaves.
Mugwort, which has densely hairy true leaves.
Scentless Mayweed, of which the first 2 true leaves have several incisions.

Characteristics

Cotyledons
Oval with entire leaf margins. Unstalked. Smooth surface. Length approx. 2-4 mm.

True leaves
The first 2 true leaves are lancet-shaped to oblong in outline with entire leaf margins and 1-2 rough projections. Unstalked. Smooth surface, sometimes with a few hairs. Later true leaves are pinnatisect. Length approx. 10-20 mm.

Mature plant
Pineapple-weed is a small plant with 10-30 cm high, erect stems. The species resembles other Mayweeds, but is smaller and lacks the white ray florets in the flower head. The diameter of flower head is approx. 5-8 mm. Seed production: Up to approx. 5,000 seeds per plant.

Seed
Oblong pitcher-shaped and slightly curved. The surface has several longitudinal, slightly rounded ribs. Thousand grain weight approx. 0.3 g.

Biology

Propagation and dispersal
Only through seeds.

Habit
Summer and winter annual.

Importance

The species can often be found in both autumn- and spring-sown crops throughout Denmark. In cereal crops and Oil-seed Rape, pineapple-weed usually has no influence on yield. However, it can be very troublesome in open crops.

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

Taxonomy

Compositae.

Names in different languages

Danish : Kamille, skive
German : Strahlenlose Kamille
English : Pineapple-weed
Latin : Chamomilla suaveolens
Norwegian : Tunbalderbrå
Swedish : Gatkamomill
Pineapple-weed: Seedling
Seedling
Pineapple-weed: Early stage
Early stage
Pineapple-weed: Flower head
Flower head
Pineapple-weed: Mature plant
Mature plant
Pineapple-weed: Seeds
Seeds
 
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