Dabi
ActiveLactuca sativa L. · Lettuce
Magali Lemont, Enza Zaden Beheer B.V.
NL
8 records
Diseases
Septoria Leaf Spot of Lettuce
Lactuca sativa L.
A fungal disease of lettuce caused by the pathogen Septoria lactucae, characterized by necrotic spots with pycnidia, leading to the destruction of the leaf blade.
In the reference 3 varieties crop Lettuce, where this is mentioned in the description.
Disease symptoms appear primarily on the lower leaves as small chlorotic spots, which eventually turn brown, become angular in shape due to vein restriction, and may be surrounded by a yellow halo. A diagnostic hallmark is the formation of black or dark brown dots—the pathogen's pycnidia—in the center of the necrotic lesions. In cases of severe infection, the affected tissues dry out and disintegrate, resulting in shot-hole symptoms, premature defoliation, and a loss of marketability.
The pathogen Septoria lactucae is spread by water splashes and contaminated seeds, surviving on plant debris and wild lettuce species. Optimal conditions for infection development include an air temperature of 20–25°C and high humidity ranging from 80 to 100%. Currently, there are no commercial lettuce varieties with pronounced genetic resistance to this pathogen, and breeding markers for resistance to this disease are rarely found in variety descriptions.
General information about the subject — on the page Septoria leaf blotch.
Varieties of 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.