In general, lamb's lettuce is not susceptible to disease if it is not too densely packed. However, powdery mildew and downy mildew on lamb's lettuce can cause unsightly discoloration on the leaves and inhibited growth.
Seed selection and water balance
While dryness is the decisive factor for the powdery mildew fungus, downy mildew of lamb's lettuce occurs when there is high humidity in the cold frame or greenhouse with little ventilation. In order to prevent an infestation, it is important to ensure sufficient plant spacing and the selection of disease-resistant seed.
tips and tricks
The downy mildew of lamb's lettuce (Peronospora valerianella) is a fungus that only affects lamb's lettuce. Other types of lettuce, such as ice lettuce or lettuce, are not affected.