Molybdenum deficiency-Lettuce

Change crop

Nutrients

Lettuce - Wilting

Symptoms
Growth of the plant is clearly inhibited, and the plants turn pale green. The leaves start wilting from the leaf tips and margins, the tissue dies off afterwards and shows a brown/yellow colour.

Reasons
Molybdenum deficiency on young plant Since deficiency symptoms of molybdenum are promoted by low pH, Mo deficiency may be mistaken as calcium deficiency. However with Ca deficiency the youngest leaves are more crinkled and darker green, which can not be confused with Mo deficiency.

Lettuce - Chlorosis

Symptoms
The plant turns pale green, and transparent spots appear in the intercostal areas of the leaves. These become necrotic later and coalesce to bigger necrotic zones. This symptom may also appear on older plants. Growth of the plants is clearly stunted.

Reasons
Molybdenum deficiency The transparent spots may be taken as damage caused by pests, e.g. miner moths, but no larvae are visible.

Lettuce - Growth retardation

Reasons
Molybdenum deficiency on young plants The transparent spots may be taken as damage caused by pests, e.g. miner moths, but no larvae are visible.

Molybdenum deficiency made worse by

Acid soils
Low pH
Low levels of soil organic matter

Molybdenum is important for

Efficient use of nitrate and P metabolism

Yara recommended fertilizers for Molybdenum

YaraVita MOLYTRAC 250

Lettuce (field grown): 250-500 ml/ha 10 to 14 days after transplanting or emergence. Repeat applications may be made at 7 to 10 day intervals. Water rate: 50-500 l/ha.