Pests and Diseases of Lettuces

Pests, Diseases and Problems of Lettuces

See also Pests and Diseases of Seedlings and Young Plants,

Pests and Diseases of Carrots, Parsley and Parsnips

Pests, Diseases and Problems of Vegetables (Brassicas and related crops)


Lettuces

Aphids (various species)

pests and diseases of lettuces Typical symptoms: Leaves are infested with pink or green aphids; the leaves may be sticky.

Prevention and treatment: See Aphids as Garden Pests


Cutworm (Noctua pronuba and other moth larvae)

Typical symptoms: Plants wilt suddenly; stems are eaten through at ground level. Large, fat caterpillars may be found in surrounding soil.

Prevention and treatment: See Pests and Diseases of Seedlings and Young Plants


Grey mould (Botrytis cinerea)

Typical symptoms: Heads of lettuce rot; a fluffy grey mould is present.

Prevention and treatment: See How to Treat Common Plant Diseases


Lettuce downy mildew (Bremia lactucae)

Typical symptoms: Yellow patches appear on leaves; white mould may develop underneath in damp conditions. The patches turn brown and angular with age.

Prevention and treatment: See How to Treat Common Plant Diseases


Lettuce root aphid (Pemphigus bursarius)

Typical symptoms: Plants wilt suddenly; growth may be stunted. Small, pale aphids are seen on the roots surrounded by a white powdery wax.

Prevention and treatment: The most effective way to avoid this pest is to grow resistant varieties. See Aphids as Garden Pests


Slugs and snails

Typical symptoms: Leaves are eaten at night; slime trails are visible.

Prevention and treatment: See Slugs and Snails – Garden Pest Control


Viruses and deficiencies

Typical symptoms: Yellow marbling or other unusual patterns on leaves.

Prevention and treatment: See Plant Diseases – Understanding the Problem


Wireworm (Agriotes lineatus)

Typical symptoms: Seedlings and larger plants grow poorly.

Prevention and treatment: See General Garden Pests

02. February 2011 by Dave Pinkney
Categories: Organic Gardening, Pests and Diseases, Plant Care | Tags: , | Comments Off on Pests and Diseases of Lettuces

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