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Corn Crop DisordersA Presentation To IPM Course/FFS Participants
ByMr. Allah Dad Khan
Provincial Coordinator IPM KPK For MINFAL Pakistan
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Nitrogen Deficiency
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Nitrogen Deficient Corn
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Zinc Deficiency
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Iron Deficient Plant
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Nitrogen Deficient Leaves
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Seedling Nitrogen Deficiency
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Zinc Deficiency
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Zinc Deficiency
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Zinc Deficiency
Symptom: • Yellow coloration in broad
bands
• Occurs in upper leaves
• Occurs in leaf middle, may progress outward
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Phosphorus Deficiency
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Phosphorus Deficienct Plant
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Phosphorus Deficienct Plant
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Phosphorous (P) Deficiencies in Corn
Symptom: • Purple coloration of lower
leaves
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Phosphorus Deficiency
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Potassium Deficiency
Symptom: • Yellow and brown
coloration of leaf margins
• Occurs first on lower leaves
• May progress to upper leaves
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Potassium Deficient Plants
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Potassium Deficient Plants
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Potash Shortage
• Potash shortage shows up in ears with poorly filled tips and loose chaffy kernels.
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Potassium Deficient Ears
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Magnesium Deficiency
Magnesium deficiency • causes whitish strips along
the veins and often a purplish color on the underside of the lower leaves
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Excessive Tillering
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Magnesium Deficient Leaves
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Magnesium Deficient Field
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Sulphur Deficiency
Symptom: • Yellow coloration in a
striping or interveinal chlorosis pattern
• Generally found in younger leaves
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Sulfur Deficient Plant
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Sulfur Deficient Plant
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Boron Deficient Plant
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Boron Deficiency
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Copper Deficient Plant
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Manganese Deficient Leaf
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Chemical Burn
Chemical burn• Chemicals may sometimes
burn tips, edges of leaves and at other contacts. Tissue dies, leaf becomes whitecap.
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Phosphate Shortage
• Phosphate shortages interfere with pollination and kernel fill. Ears are small, often twisted and with undeveloped kernels.
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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.
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Unpollinated Kernels
• Dry weather slows silking behind tasseling; kernels aren't pollinated.
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Compaction
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Drought Stress
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Wind Damage
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