Crop Protection Online > Pests - Weed biology<br> <sub>Agro-region: Denmark</sub> - Euphorbia helioscopia L.
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21.8 2019 undefined

Weed biology
Agro-region: Denmark

Euphorbia helioscopia L. Previous page Next page

Go to identification key for weeds

Can be mistaken for

Euphorbia peplus L., which has somewhat smaller dicotyledon leaves and true leaves.
Thlaspi arvense L., which has no latex.

Characteristics

Cotyledons
Oval with entire leaf margins. Stalked. Smooth surface. Length approx. 6-12 mm.

True leaves
Inverted egg-shaped with finely toothed leaf margins on the extreme parts of the leaf. Unstalked. Smooth surface. The true leaves contain latex, which can be seen by squeezing a torn-off leaf. Length approx. 8-11 mm.

Mature plant
Sun Spurge is a medium-sized, 10-40 cm high plant, which is known by the arrangement of the flowers in umbel-like inflorescences. The entire plant contains large amounts of latex. Seed production:Up to approx. 650 seeds per plant.

Seed
Egg-shaped to oval in circumference with a small tilted disc at one end. Circular cross section. Net-pitted surface. Thousand grain weight approx. 2.9 g.

Biology

Propagation and dispersal
Only through seeds.

Habit
Summer annual.

Importance

The species is found throughout Denmark, mainly in open and/or late-sown spring crops. Sun Spurge is usually among the less important weed species.

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Taxonomy

Euphorbiceae.

Names in different languages

Danish : Vortemælk, skærm
German : Sonnenwendwolfsmilch
English : Sun Spurge
Latin : Euphorbia helioscopia L.
Norwegian : Åkervortemjølk
Swedish : Revormstörel

Euphorbia helioscopia L.: Seedling
Seedling
Euphorbia helioscopia L.: Early stage
Early stage
Euphorbia helioscopia L.: Flower
Flower
Euphorbia helioscopia L.: Mature plant
Mature plant
Euphorbia helioscopia L.: Seeds
Seeds

 
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