Lettuce
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Lettuce - Wilting
Symptoms
Plants seem to be wilted and flabby. Along leaf tips and margins chlorotic mottling arises, which proceeds from old to younger leaves. Grey-brown necrotic areas develop in the chlorotic zones. Starting on the tips, leaves turn yellow and fade.
Sometimes veins show light red or pink discoloration.
Furthermore copper deficiency leads to inhibited growth and small, light heads.
Reasons
Copper deficiency on lettuce
Copper deficiency made worse by
- Organic soils
- Chalky soils
- Sandy soils
- Reclaimed heathland
- High nitrogen applications
Copper is important for
- Production of enzymes
- Important role in photosynthesis and phenol metabolism of plants
- Regulation of destructive superoxide radicals inside cells
- Prevention of fungal diseases