Corn Crop DisordersA Presentation To IPM Course/FFS Participants

ByMr. Allah Dad Khan

Provincial Coordinator IPM KPK For MINFAL Pakistan

Nitrogen Deficiency

Nitrogen Deficient Corn

Zinc Deficiency

Iron Deficient Plant

Nitrogen Deficient Leaves

Seedling Nitrogen Deficiency

Zinc Deficiency

Zinc Deficiency

Zinc Deficiency

Symptom: • Yellow coloration in broad

bands

• Occurs in upper leaves

• Occurs in leaf middle, may progress outward

Phosphorus Deficiency

Phosphorus Deficienct Plant

Phosphorus Deficienct Plant

Phosphorous (P) Deficiencies in Corn

Symptom: • Purple coloration of lower

leaves

Phosphorus Deficiency

Potassium Deficiency

Symptom: • Yellow and brown

coloration of leaf margins

• Occurs first on lower leaves

• May progress to upper leaves

Potassium Deficient Plants

Potassium Deficient Plants

Potash Shortage

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

Potassium Deficient Ears

Magnesium Deficiency

Magnesium deficiency • causes whitish strips along

the veins and often a purplish color on the underside of the lower leaves

Excessive Tillering

Magnesium Deficient Leaves

Magnesium Deficient Field

Sulphur Deficiency

Symptom: • Yellow coloration in a

striping or interveinal chlorosis pattern

• Generally found in younger leaves

Sulfur Deficient Plant

Sulfur Deficient Plant

Boron Deficient Plant

Boron Deficiency

Copper Deficient Plant

Manganese Deficient Leaf

Chemical Burn

Chemical burn• Chemicals may sometimes

burn tips, edges of leaves and at other contacts. Tissue dies, leaf becomes whitecap.

Phosphate Shortage

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

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.

Unpollinated Kernels

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

Compaction

Drought Stress

Wind Damage