Peas physiological disorders By Mr. Allah Dad Khan Provincial Coordinator IPM KPK MINFAL Islamabad

1. Peas Physiological Disorders

2. Beans Physiological
Disorders
ToT to FFS Staff
By Mr. Allah Dad Khan
Provincial Coordinator IPM KPK
MINFAL

3. Pea Plants Phosphorus Deficiency
Symptoms
• Overall dark green with
purple, blue or reddish cast to
leaves particularly on
underside, veins and stems
and some plants respond to
lack of P with yellowing.
Foliage may be sparse, small
and distorted becoming
mottled and bronzy with
maturity. Very distinctive
symptoms. Excess foliage with
no flowers can also indicate
lack of (P).
Growth dwarfed and thin; leaves dull, lustreless
green; older leaves wither and die early

4. Nitrogen Deficiency
Symptoms
• Little new growth, yellow
leaves: this being more
pronounced in older leaves.
Earlier fall leaf drop. New
shoots may be red to red-
brown

5. Pea Stem and Foliage Calcium
deficiency
Symptoms
• Young leaves are small and
distorted with curled back
leaf tips. Shoots may be
stunted and show some
dieback, roots will be
stunted.
Young stems, pedicels and leaf
tissues wilt and collapse

6. Peas Leaves Magnesium deficiency
Symptoms
• A lack of magnesium is
characterized almost identically
with iron deficiency but the older
leaves, generally at the bottom of
the plant, show marginal and
interveinal reddening or yellowing
with leaf base and midrib staying
green. Later in the season
interveinal necrosis may occur.
Leaves may be brittle and thin with
leaf curling and stunted growth..
Apples may drop prematurely. In
the fall as temperatures cool plants
are unable to take up Mg and
leaves will turn a purple color.
Central intervenal chlorosis and
green marginal bands

7. Sulfur Deficiency
Symptoms
• Leaves are pale yellow-
green at any stage of
development. Shoots are
stunted. Similar to chlorosis

8. Pea Plants Potassium deficiency
Symptoms
• Sickly looking plants,
undersized fruits, leaves
showing marginal and
interveinal yellowing.
Yellowing starts on older
leaves and progresses
upwards. Leaves may crinkle,
turn brown and roll upwards.
Blossoms may be distorted
and small. Plant has little
resistance to heat, cold and
disease problems
Young internodes very short and plants
squat; older leaves marginal scorch.

9. Pea Leaves Manganese deficiency
Symptoms
• Similar to N deficiency,
leaves display marginal
scorching, rolling and
reduced width. Yellowing
may also occur between
leaf veins or total yellowing
on youngest leaves
Intervenal chlorosis beginning at
margins

10. Pea Seeds Manganese deficiency
Symptoms
• Similar to N deficiency,
leaves display marginal
scorching, rolling and
reduced width. Yellowing
may also occur between
leaf veins or total yellowing
on youngest leaves
Brown lesions in centers of
cotyledons. ("Marsh Spot")

11. Pea Plants Boron deficiency
Symptoms
• Stems thickened and stiff,
growth squat and bushy
habit; foliage chlorotic,
young leaflets small and
tips brown; growing points
die.

12. Chimaera
Symptoms
• Also spelt Chimera. A minor
genetic oddity of no real
significance. Causes
variegation with clearly
defined edges, thus differing
from most disease symptoms.
Stems and petioles are
similarly affected. May safely
be ignored as it does no harm
and cannot spread to other
plants

13. Molybdenum (Mo)
• Only a problem with brassicas like broccoli,
cauliflower etc in acid soil. Heads can fail to
form, leaves will become thin, elongated and
rippled.

14. Blindness
Symptoms
• Sometimes the growing points
of cordon trained sweet peas
may go 'blind' in the middle of
the season. Some varieties are
particularly prone to this
problem, which is often due to
the plant having suffered a
very cold spell over winter. To
overcome this, avoid being too
efficient when removing side
shoots - always have one held
in reserve for such
eventualities.

16. Zinc deficiencies
• Zinc deficiencies are mainly found on sandy
soils low in organic matter and on organic
soils. Zinc deficiencies occur more often
during cold, wet spring weather. New and
intermediate leaves are small, yellow,
sometimes with a grayish cast. Narrow and
older leaves may drop. Small shoots may show
rosetting followed by dieback