Corn Field Manuals

Nitrogen Deficiency
In young plants, nitrogen deficiency shows as stunted, spindly growth and…
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Phosphorus Deficiency
Stunted growth, leaves small and dark bluish-green, may develop…
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Potassium Deficiency
Potassium deficiency first shows as yellowing or browning of the edges of…
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Sulfur Deficiency
Stunted, spindly plants having a light green to yellowish-green color on…
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Magnesium Deficiency
Interveinal chlorosis starts on the lower leaves. Yellow streaking…
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Calcium Deficiency
The leaf tips stick to the next lower leaf, giving a ladder-like…
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Zinc Deficiency
Older leaves start with light yellow streaks or chlorotic striping between…
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Manganese Deficiency
Leaves become olive green with interveinal chlorosis. The yellow and green…
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Iron Deficiency
Chlorosis or yellowing between the veins and the veins remain green.…
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Copper Deficiency
Younger leaves lose turgidity, appear to wilt, lose color, may break, tips…
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Boron Deficiency
Newly formed leaves show elongated watery or transparent stripes scattered…
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Goss Bacterial Wilt
This bacterial disease of corn has caused severe yield reductions in…
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Goss Wilt Systemic Infection
In addition to the foliage symptoms this disease can also result in a…
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Charcoal Stalk Rot
Is a series disease of corn in dryland production areas of the corn belt.…
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Eyespot
Oval to circular spots up to 1/2 cm in diameter. Spots become tan and…
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Fusarium Stalk Rot
This is one of the most common and severe diseases of corn throughout the…
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Gibberella Stalk Rot
Causes sudden death of plants in late August or early September. The dead…
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Gibberella Ear Rot -- Gibberella Rot
Sometimes called pink ear rot, this disease is frequent in the cool, humid…
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Anthracnose Stalk Rot
Shows black streaks on the lower internodes and a brownish discoloration…
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Corn Smut Gall
Is first seen as a grayish lump which may grow to considerable size. When…
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Sorghum Downy Mildew
Sorghum Downy Mildew of corn is a serious problem in some southern areas…
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Physoderma Brown Spot
Is a disease of relatively minor importance in most of the corn production…
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Southern Corn Leaf Blight
Present in the more humid areas of corn culture and favored by slightly…
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Northern Corn Leaf Blight
Seldom seen before tasseling time. Boat-shaped, grayish lesions develop in…
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Yellow Leaf Blight
Favored by cool, wet weather and more common in the northern and eastern…
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Common Corn Rust
Oval to elongated reddish-brown pustules scattered over the leaf. Later…
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Corn Lethal Necrosis
Is a relatively new virus disease of corn that has been found in Nebraska…
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Maize Dwarf Mosaic (MDM) Maize Chlorotic Dwarf (MCD)
These two virus diseases are the most destructive of several known virus…
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Crazy Top
Results in excessive tillering and twisting of upper leaves. The most…
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Corn Rootworm
Corn Rootworm feeding on corn roots causes lodging or "goosenecking" of…
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Armyworm
The Armyworm feeds primarily on plants of the grass family. Outbreaks…
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Corn Earworm
Full grown larva, rarely more than one found per ear, because they are…
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Black Cutworm
This is one of the most destructive species of cutworms attacking corn.…
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Differential Grasshopper
Grasshoppers are general feeders. Damage to corn and other cultivated…
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Wireworm Damage
These hard shelled larvae of "Click Beetles" often damage corn severely by…
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Billbug
Corn planted in low, poorly drained areas or adjacent to sloughs or bogs…
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