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Lettuce


[R] Lactuca sativa L. (Asteraceae).
Fr: Laitue; Ge: Kopfsalat; Sp: Lechuga; It: Lattuga; Pt: Alface.
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- Annual plant, cultivated in Europe since ancient times (*) . It is the most popular salad ingredient.
- The principal European producers are Spain, Italy, France and the Netherlands.
- There are many varieties: cabbage lettuce, Batavia, Romain etc; which are adapted to different climatic conditions.
-- Propagation is by sowing in nurseries or in fields; the plants are transplanted at the 4- to 5-leaf stage in open fields, under plastic tunnels or in glasshouses. Harvesting occurs 5 to 7 months after sowing.
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- Diseases: Sclerotinia diseases (Sclerotinia minor) and grey mould can seriously affect lettuce cultivation. Downy mildew is also a problem. Among the virus diseases, lettuce mosaic(LMV) is the most widespread.
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- Principal European pests: pests cause little serious damage to lettuce. The field slug (Deroceras reticulatum) eats seedling leaves.
Many aphids attack the leaves or roots: the peach-potato aphid (Myzus persicae), the currant-sowthistle aphid (Hyperomyzus lactucae) and the (Nasonovia ribis-nigri). The common wood mouse (Apodemus sylvaticus) and the common vole (Microtus arvalis) may severe the base of the stems. Nematodes may also pose serious problems.
The garden swift moth (Korscheltellus lupulinus), the lettuce root aphid (Pemphigus bursarius) and Protrama flavescens (Koch) (Hom., Lachnidae) attack the roots.

[R] Images

* Lettuce (Minost C.)
a: taproot, short and dick; b: rosette leaves.


To read this page in French

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

HYP3 : HYPP Phytopathology.

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