Corn disorders A Lecture By Mr Allah Dad Khan

2. Corn Crop Disorders
A Presentation To IPM Course/FFS
Participants
By
Mr. Allah Dad Khan
Provincial Coordinator IPM KPK For
MINFAL Pakistan

3. Nitrogen Deficiency

4. Nitrogen Deficient Corn

5. Zinc Deficiency

6. Iron Deficient Plant

7. Nitrogen Deficient Leaves

8. Seedling Nitrogen Deficiency

9. Zinc Deficiency

10. Zinc Deficiency

11. Zinc Deficiency
Symptom:
• Yellow coloration in broad
bands
• Occurs in upper leaves
• Occurs in leaf middle, may
progress outward

12. Phosphorus Deficiency

13. Phosphorus Deficienct Plant

14. Phosphorus Deficienct Plant

15. Phosphorous (P) Deficiencies in Corn
Symptom:
• Purple coloration of lower
leaves

16. Phosphorus Deficiency

17. Potassium Deficiency
Symptom:
• Yellow and brown
coloration of leaf margins
• Occurs first on lower leaves
• May progress to upper
leaves

18. Potassium Deficient Plants

19. Potassium Deficient Plants

20. Potash Shortage
• Potash shortage shows up in ears with poorly
filled tips and loose chaffy kernels.

21. Potassium Deficient Ears

22. Magnesium Deficiency
Magnesium deficiency
• causes whitish strips along
the veins and often a
purplish color on the
underside of the lower
leaves

23. Excessive Tillering

24. Magnesium Deficient Leaves

25. Magnesium Deficient Field

26. Sulphur Deficiency
Symptom:
• Yellow coloration in a
striping or interveinal
chlorosis pattern
• Generally found in younger
leaves

27. Sulfur Deficient Plant

28. Sulfur Deficient Plant

29. Boron Deficient Plant

30. Boron Deficiency

31. Copper Deficient Plant

32. Manganese Deficient Leaf

33. Chemical Burn
Chemical burn
• Chemicals may sometimes
burn tips, edges of leaves
and at other contacts.
Tissue dies, leaf becomes
whitecap.

34. Phosphate Shortage
• Phosphate shortages interfere with pollination
and kernel fill. Ears are small, often twisted
and with undeveloped kernels.

35. Nitrogen Shortage
• Nitrogen is essential throughout the growing
season. If plant runs out of nitrogen at critical
time, ears are small and protein content is
low. Kernels at tip do not fill.

36. Unpollinated Kernels
• Dry weather slows silking behind tasseling;
kernels aren't pollinated.

37. Compaction

38. Drought Stress

39. Wind Damage