AND DISEASES in Peas and Beans
Brown sunken spots on beans. Also dark specks or patches on
foliage of French and Runner beans enlarge to become dark brown
cankers. Later these are covered in white or pink fungal spores.
Can kill plants. Worst in very wet, cool summers. Rarely serious.
Do not save seed from affected plants.
Red/brown patches show on foliage of broad beans. Similarly
coloured streaks show on the stems, and these may merge. Markings
change to black and plants die. Can occur in wet season especially
if drainage is poor and plants are growing soft due to either
insufficient or excessive nitrogen, are growing in shade, or
are too crowded. Overwintered crops are most vulnerable in a
plants after harvest to prevent overwintering the fungus. Autumn
Maintain pH 7- optimum for favas. Spring thinly-sown crops often
escape infection.Ensure soil is well drained.
Semi-transparent, angular watery spots surrounded by a yellow
‘halo’ show on foliage of French and Runner beans.
The patches often join together and become brown and dry. Pods
and leaves shrivel if the outbreak of this bacterial disease
is severe, but attacks on runner plants are never severe. Can
be spread by infected seeds. It is a bad practice among gardeners
to soak bean seeds before sowing them
soak seeds before sowing.
After cropping burn plants. Do not save seed from affected plants.
Control – none.
on Broad beans.
They congregate near the growing tip from May onwards. Leaves
also covered with black sooty mould. They increase rapidly if
unchecked leading to weakened plants and a lower yield. Newly
planted French and Runner beans also attacked from June on.
Colonies suck sap from the plants. Plants sicken and can die.
A few can appear on the underside of French and Runner bean
leaves if the plants are short of water at the roots.
Numbers decline from July on.
They overwinter on native euonymous.
any young shoots that appear at ground level and at the base
of broad bean plants. As soon as first pods are setting, pinch
out growing point of each plant once 5 flower trusses have developed.
This removes the most attractive feeding site. Keep weed-free.
Ensure that all bean plants are well watered in dry weather
as a preventative measure.
Ladybirds and other insects may eventually control, but not
until after damage done.
Prevention – none.
Seeds do not germinate. When dug up they are found to be rotten
and infested with tiny, light brown, thread-like creatures.
Rarely occurs with Broad beans. Female millipedes lay eggs in
rotting vegetation. The seeds have rotted because they were
sown in cold soil.
when the soil is warming.
Leaves notched. They feed by eating notches from the leaf margins
of pea and broad bean plants. Leaf-edges of Broad bean and Pea
seedlings have U-shaped holes. The larvae feed on the roots
in late spring. The weevils are grey/brown, ½ cm long
and emerge from the soil in June or July. They feed until the
autumn. Not serious.
worry about this pest. Damage is rarely severe and strongly
growing plants quickly grow out of trouble.
green or pink aphids start to colonise pea plants during May
or early June. Large numbers cause damage and need to be controlled.
soap-based spray before the colony has had time to build up.
Bean seedlings are eaten and pods which touch the ground are
also frequently damaged.
clean cultivation. Do not leave large stones, bricks or debris
around the garden. Grow away from hedges and walls.
where wasteland or lawn has been prepared for vegetable growing.
Seeds do not germinate or young plants die. Small hard-skinned,
shiny yellow grubs are found on rotting seeds or roots.
wireworms found when digging and hoeing. Hoeing also exposes
the pests to birds which eat them. Baiting can be helpful –
bury pieces of carrot. Inspect every few days and pick off the
to emerge. Soil-living grubs up to 8mm long feed on the seeds
and emerging seedlings of peas and beans, especially early in
the season. Maggots can prevent germination of French and Runner
bean seed. Damage usually occurs in cold, wet seasons when germination
– do not sow too early, but when soil is warming, or sow
in small pots and plant out when soil has really warmed up.
badly damage peas, eating the green peas and spoiling the crop,
particularly mid-season varieties. Pea moths active May/early
June and lay eggs on flower stalks.
Grubs move inside developing peas until August and then overwinter
in the soil as cocoons.
(round) peas. Sow middle of March - these usually escape damage
because they flower before the pea moth lays its eggs. Or sow
peas after mid-May. Can also sow hardy varieties in autumn to
overwinter (winter cultivation will destroy some caterpillars).
mottled yellow or dark green and crinkled. Plants may also be
stunted and pods may be discoloured and distorted. If stems
of pea plants are affected, the whole plants may collapse. The
virus is spread by aphids. French and Runner beans may be affected.
and destroy affected plants. Control aphids.
patches on leaves. Lower surfaces are covered in mauve or white
fungus. A problem on peas in cool, wet seasons. Affected leaves
eventually turn brown and die, and the yield is reduced.
– destroy affected plants.
Prevention – none.
leaves to lace.
beetles and their tiny yellow, spiny larvae. Clusters of orange
eggs can be crushed in the process.
covered with white powdery mould. Occurs in hot dry summers.
well watered if a very warm season.
wilt, starting with the oldest leaves. French and Runner beans
are affected. If the stem is cut, a brown stain running through
the internal tissues confirms the presence of the fusarium fungus.
– destroy infected plants as soon as possible.
Prevention – practise crop rotation. Improve soil structure
turn yellow and die, stems become blackened at soil level and
roots rot. Both peas and beans may be attacked by this soil-borne
disease. Yield will be affected and plants may be stunted.
destroy affected plants.
Prevention-practise crop rotation.
fail to appear or collapse at soil level.
fail to appear. Look for signs of burrowing or seedlings nipped
off at soil level. Mice are the most likely culprits and they
often move systematically along the rows.
– trapping is effective.
Prevention –none, but laying spiky leaves on top of the
seed can act as a deterrent.
spots on pea pods. Peas inside may be discoloured. Leaves and
stem may be spotted too. Early crops are most vulnerable and
this disease is worst in wet seasons.
and destroy diseased plants.
Do not save seed of affected crops.
patches on pea pods. Pods may also be distorted and yield reduced.
Silvery patches may occur on leaves. Attacks are worse in hot,
dry seasons when the small (2mm) yellow or black thrips are
inside peas. Look also for yellowing of the leaf veins. The
cause is lack of manganese in the soil. It is most common on
Prevention-incorporate organic matter into the soil before sowing.
Use a fertiliser containing trace elements, such as one based
on seaweed, or fritted trace elements.
and leaves covered in grey/brown fluffy mould. This is worst
in wet seasons.
overcrowded or damp conditions.
red or orange powdery spots or streaks on leaves. Different
species of rust fungus attack a whole range of plants.
and Prevention-remove badly affected plants to limit spread.
Practise crop rotation. Do not wet the leaves when watering.
the roots of runner, French and sometimes broad beans during
the summer. This aphid is a creamy brown colour and can be difficult
to detect among the soil and roots, but its presence is indicated
by the white waxy powder that the aphids secrete. This white
dusting of the insects and roots can be mistaken for a mould.
The aphids suck sap from the roots, and this can lead to poor
growth, wilting and reduced cropping.
grow beans in the same soil in consecutive years if root aphid
is known to have been present.
aromatic herbs – Savory, Garlic, Nasturtium, Hyssop,
Sage, Calendula and Borage are bug-baffling.
Plant beans next to potatoes to deter bean beetles and potato
Root exudates from peas increase the availability of N, K,
P and Ca. Tomatoes will help minimise the damage to beans
caused by leaf hoppers.
The following are carried by seed from one season to the next
- Pod spot; Anthracnose; Halo blight.
Resistant to Fusarium wilt :
MGT Sugar Ann
MGT Sugar Snap