45-140
ActiveLactuca sativa L. var. capitata L. · Head lettuce
Kees Reinink
UA
1 record
Pests
Aphids on head lettuce
Lactuca sativa L. var. capitata L.
Aphids are a dangerous pest of head lettuce, causing leaf deformation, loss of marketability, and the transmission of viral infections. The most damaging species is the lettuce aphid, which is capable of colonizing the inner parts of the head.
In the reference 4 varieties crop Head lettuce, where this is mentioned in the description.
The main species affecting the crop are the lettuce aphid (Nasonovia ribisnigri), the green peach aphid (Myzus persicae), as well as Aulacorthum solani, Macrosiphum euphorbiae, Myzus ascalonicus, and Aphis gossypii. Damage manifests as curling of young leaves, stunted plant growth, dwarfism, and the secretion of honeydew, which triggers the development of sooty mold.
In breeding for resistance to Nasonovia ribisnigri, the Nr gene derived from Lactuca virosa is used. The pest is represented by biotypes Nr:0 and Nr:1. Varieties possessing complex resistance are labeled in catalogs as Nr:0,1, which indicates the plants' ability to withstand both the base biotype and the Nr:1 biotype that overcomes standard resistance.
General information about the subject — on the page Aphids.
Varieties of Head lettuce mentioned in the description
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.