These diseases occur in lettuce
The most common disease in lettuce is the wrong one mildew. In addition, lettuce can contract lettuce rot and various viruses.
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Wrong mildew
Downy mildew can only be treated if it is discovered in good time. If the infestation is severe, the corresponding lettuce should be removed immediately to prevent the disease from spreading.
Causes of downy mildew
Downy mildew occurs when the weather is constantly too humid and the leaves lie directly on the wet ground.
Recognize downy mildew
Lettuce affected by downy mildew shows yellow-brown spots on the upper side of the leaf and greyish-white spores on the underside of the leaf.
Prevent and combat downy mildew
- Prevent too much moisture, increase or increase lettuce with sticks or similar from the ground in the event of prolonged rain. ventilate
- Avoid fertilization containing nitrogen
- remove diseased leaves
- Treat infected lettuce with a stock of onions, garlic and horsetail
Lettuce rot
Lettuce rot is usually a mixture of different infections and is also due to too much moisture. Symptoms are putrid spots on the underside of the leaf.
The measures are similar to those for downy mildew:
- Cut away diseased leaves
- ensure better ventilation, avoid moisture
- Limescale if the pH value is too low
prevent diseases
Most diseases are caused by excessive moisture and a weakened plant. As a preventive measure, you should therefore generally:
- Crop rotation note (only plant lettuce in the same place every three to four years)
- ensure adequate ventilation
- Remove weeds regularly
- don't pour too much
- Avoid waterlogging
- possibly liming if the pH value is too low
- do not plant too densely
Lettuce varieties resistant to diseases
If you have had lettuce diseases in the past, you will probably be pleased to learn that there are resistant strains. The early varieties Dynamite and Merveille des 4 Saisons are particularly resistant to viruses and diseases. You can find an overview of other early, medium and late varieties here.
