Pests and Diseases of Peas and Beans

Pests, Diseases and Problems of Vegetables

See also Pests and Diseases of Seedlings and Young Plants,

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

Garden Pests and Diseases of Beets


Peas, Beans and related crops

Pests and Diseases of Peas and Beans Including: broad beans, French beans, runner beans, clover and vetches

All peas, beans and related crops are susceptible unless otherwise stated.


Bean root aphid (Smynthurodes betae)

This affects runner, French and broad beans.

Typical symptoms: Poor growth and crop. Small creamy-brown aphids associated with a white waxy powder are found on roots.

Prevention and treatment: Use crop rotation. See Aphids as Garden Pests


Birds (especially jays)

Typical symptoms: Triangular pieces pecked out of pods.

Prevention and treatment: See General Garden Pests


Black bean aphid (Aphis fabae)

This aphid is found on broad beans and runner beans. It also attacks beetroot and spinach beet and ornamentals including nasturtiums, poppies and dahlias.

Typical symptoms: Colonies of small black aphids are visible on main growing shoots., These may spread down the plant and on to the pods, stunting growth and reducing the crop.

Prevention and treatment: Autumn-sown broad beans are less susceptible to attack. Pick out and destroy infested growing shoots; spray with insecticidal soap if the attack is severe. See Aphids as Garden Pests


Broad bean rust (Uromyces viciae-fabae)

Broad beans and peas are affected.

Typical symptoms: The underside of leaves and the stems develop rusty-brown pustules. Broad bean rust is spectacular but rarely serious.

Prevention and treatment: Avoid damp, sheltered sites. Clear up and compost all crop debris.


Chocolate spot (Botrytis fabae)

Broad beans, field beans and winter tares are affected by chocolate spot.

Typical symptoms: Small chocolate brown spots are visible on leaves and stems. The spots may blacken and merge in damp conditions.

Prevention and treatment: To reduce the incidence of chocolate spot, avoid growing broad beans in damp, sheltered sites with poorly drained soil. Increase soil potash levels if they are low. Autumn-sown broad beans are more susceptible. If the crop is infected, clear up and compost all debris once the beans have been picked.


Foot and root rots (Various fungi)

Typical symptoms: The plants collapse; roots and/or base of the stem are rotted.

Prevention and treatment: See Tomatoes Pests and Diseases


Mice

Peas and broad beans are eaten by mice.

Typical symptoms: Seeds are removed from the soil, leaving a small hole above the site of the seed. Seedlings may also be disturbed and seeds removed.

Prevention and treatment: See How to Treat Common Plant Diseases


Pea and bean weevil (Sitonia lineatus)

This weevil affects broad beans, peas, clover and vetches.

Typical symptoms: Greyish-brown weevils feed on the leaves, creating a characteristic scalloped edge. Seedlings may fail to thrive if attacked when young. The symptoms cause little harm to older plants.

Prevention and treatment: Where this pest is a problem, avoid early sowings, which will be slow to get started. If small plants are severely affected, treat with derris.


Pea moth (Cydia nigricana)

The pea moth affects peas only.

Typical symptoms: Peas are eaten in the pod by small, black-headed caterpillars. The pea moth lays its eggs on pea flowers and the larvae move into the pods when they are very small, so no external damage is visible.

Prevention and treatment: Sow peas either early or late so that they are not in flower when the pea moth is laying its eggs (normally early to mid-summer). Alternatively, cover plants with a fine mesh material while they are in flower. This should not reduce cropping. Winter-dig plots where infested plants were growing.


Pea powdery mildew (Erysiphe pisi)

Pea powdery mildew affects peas only.

Typical symptoms: White powdery patches are visible on leaves and pods, especially in dry conditions.

Prevention and treatment: See How to Treat Common Plant Diseases


Poor pod set

This is a problem of runner beans.

Typical symptoms: Flowers fail to set pods.

Prevention and treatment: See Plant Disorders – Understanding the Problem


Thrips (Kakothrips robustus)

Thrips affect peas only.

Typical symptoms: Leaves and pods show a characteristic silver sheen and the pods may also be distorted. Thrips, also commonly known as thunder flies, are mainly a problem in hot, dry weather conditions. Yellow larvae and yellow-brown adults are present on affected plants in late spring/early summer.

Prevention and treatment: Ensure that plants do not go short of water during spells of hot, dry weather. Winter-dig plots where infested plants have been growing.


Virus

Typical symptoms: Unusual yellow patterns appear on the leaves of infected plants. Plants may be stunted and growth generally poor; also, plants may develop distorted leaves, flowers and pods.

Prevention and treatment: See Plant Disorders – Understanding the Problem


Wilt (various fungi)

Typical symptoms: The plants wilt, oldest leaves first. When the stem is cut through a dark streak is visible.

Prevention and treatment: See How to Treat Common Plant Diseases

02. February 2011 by Dave Pinkney
Categories: Kitchen Garden, Legumes, Organic Gardening, Pests and Diseases | Tags: , , | Comments Off on Pests and Diseases of Peas and Beans

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