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Onion


[R] Allium cepa L. (Liliaceae).
Fr: Oignon; Ge: Zwiebel; Sp: Cebolla; It: Cipolla; Pt: Cebola.
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- Biennial bulbous plant (*) .
- The bulb is consumed as a vegetable or condiment. There are many different varieties.
* White onions, sown in spring or autumn, in fields or nurseries, harvested when mature.
* Coloured onions, sown in nurseries at the end of summer, transplanted in autumn or winter, harvested at maturity in July. They do not store well.
* Guard onions, sown in fields at the beginning of spring, harvested at maturity in autumn. They store well.
* Short day onions, sown in autumn, harvested at the end of spring and having a limited storage life.
* Mulhouse onions, cultivated in high seed density in fields that are harvested in July and have poor storage life.
- The date of planting varies with the type of onion, the variety and its use.
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- Diseases: attacks of the base by downy mildew and various bacterial diseases can seriously depreciate the product.
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- Principal European pests: the onion fly (Delia antiqua) is the most serious pest. The garden dart moth (Euxoa nigricans) attacks the seedling leaves. The leek moth (Acrolepiopsis assectella) and Crioceris merdigera L.(Col., Chrysomelidae) attack the leaves.
Also causing damage are the stem nematode (Ditylenchus dipsaci), the bean seed fly (Delia platura) and the onion thrips (Thrips tabaci).

[R] Images

* Onion (Minost C.)
a: root; b: bulb; c: young leaf.


To read this page in French

HYPPZ on line: Species (scientific names), Pests (common names), Glossary, Crops.

HYP3 : HYPP Phytopathology.

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