This document discusses physiological disorders in okra including chilling injury, freeze damage, and deficiencies of various nutrients such as potassium, boron, iron, manganese, and zinc. Chilling injury symptoms include discoloration, pitting, and water-soaked lesions. Freeze damage occurs below -1.8°C. Deficiencies result in stunted growth, chlorosis, and malformed fruits. The recommended corrections include foliar sprays of various nutrients or soil applications.

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

3. Chilling Injury
Symptoms
•
Chilling injury. The typical
symptoms of chilling injury in
okra are discoloration, pitting,
water-soaked lesions and
increased decay (especially after
removal to warmer temperatures,
as during marketing). Different
cultivars may differ in their
susceptibility to chilling injury.
Calcium dips and modified
atmospheres have been reported
to reduce chilling symptoms

4. Freeze damage.
Symptoms
• Occurs at temperatures of -
1.8°C

5. • PotassiumDeficiency
SymptomsStunted plant
growth; old leaves become
turn yellow in color and
occurence of marginal
chlorosis
• Correction MeasureFoliar
spray of KCl@1%

6. • BoronDeficiency
SymptomsLeaves become
brittle; stunted plant growth
• Correction MeasureFoliar
spray of borax@0.5%

7. • BoronDeficiency
Symptomsyoung leaves
become smaller in size;
malformed fruits
• Correction MeasureFoliar
spray of borax@0.5%

8. • IronDeficiency
SymptomsStunted plant
growth; chlorosis occur in
young leaves
• Correction MeasureFoliar
spray of FeSO4 @ 05.%

9. • ManganeseDeficiency
SymptomsReduction in
internode length was
observed about 5 weeks
before the leaves showed
chlorosis.
• Correction MeasureFoliar
spray of MnSO4 @0.5%

10. • ZincDeficiency
SymptomsMarked depression
in leaf production and leaf size
occurred within about 3 weeks
and leaf mottling developed
about 2 weeks later. The stem
diameter was reduced.
• Correction MeasureFoliar
spray of ZnSO4 0.5% or Soil
application of 10kg ZnSO4/ha