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Pre-Emergence (Emergence To Knee High (Dead or stunted, discolored plants,…
Pre-Emergence
Emergence To Knee High
Leaf Margins Damaged
Yellow Striped Armyworm, Armyworm, Fall Armyworm
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Uneven Growth
Insects, Nutrient Deficiencys
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Leaf edges, yellow or dead
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Dead or stunted, discolored plants, into normal plants at margin of affected area
Stewart's Leaf Blight, Ammonia Injury, Cultivator Injury, Nematodes, Glyphosate Drift Injury
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Insect Damage: Dinitroaniline herbicid, White Grub, Wireworm
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Pale green color
Waterlogged Soils, Glyphosate Drift Injury, Nitrogen Deficiency,
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lower leaves dead, tips dying on upper leaves
Fertilizer Injury, Chinch Bug
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Leaves appear water - soaked, to grayish becoming necrotic
Ammonia Injury, Frost, Paraquat Injury
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Leaves rolled , plants wilted
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Drought Stress, Root Feeding Insects, Mechanical Injury to Root
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leaves tightly rolled, not wilted
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Herbicide Injury-2,4-D, dicamba
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Dead Plants Present
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Lightning, Cultivator Injury
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Windowpane effect
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Insect Damage: Southern Corn Rootworm, Cereal Leaf Beetle, Grape Colaspis, Redheaded Flea Beetle
large holes in leaves
Variegated Cutworm, Sod Webworm, Common Stalk Borer, Slugs
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Plant Mostly White
Genetic Mutation, Isoxaflutole, Mesotrione,Drift or Carryover
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Knee-High to Tasseling
Stunting, tillering, twisting
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stunting, red leaves, excessive silvering
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Stalks collapse from rot
European Corn Borer 2, 4 D Herbicide injury cutworm
Leaves completely white, or top leaves or scattered leaves white
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Plant lean or fall over
rootworm , strong winds before brace roots have formed.Nematodes
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Yellowing of plants, beginning with lower leaves at leaf tip among midrib
nitrogen deficiency, standing water
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Yellowing of leaf margins, beginning at tips; affected Tissue later turns brown and dies
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pupling or reddening of leaves, from tip backward; affects lower leaves initially; leaf tips may later turn dark and die
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Yellow or dead leaves, or plants
ammonia burn, usually end rows
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leaves eaten
armyworm, variegated cutworm, stalk borer, southwest corn borer, grasshopper, cutworm, wildlife
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Silking to Maturity
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Silks eaten off
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insect damage: corn root worm, grasshopper, Japanese beetle, wolleybear catepilar
Improper kernel set
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2, 4-D or dicamba applied at improper time
Large, irregular areas eaten in leaves
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Insect damage: grasshopper, Fall armyworm
Shucks eaten or open, kernels eaten or damaged
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Grasshoppers, birds, Rodents
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Dead, frosted appearance of leaves
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Barren stalk, no ears, only stunted nubbins or scattered kernels
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Rotted Seed or seedlings
Seed Rots: Pythium, Diplodia, Gibberella, Fusarium, Colletotrichum
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Seeds hollowed out
Insect Damage: Seed Corn Maggot, Wireworm, Seed Corn Beetle, Thief Ant, Flea Beetle Larvae
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Plants Pulled up eaten
Bird Damage: Crows, pheasants, blackbirds. Rodent Damage: Mice, Voles, Ground Squirrels
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Seed Swelled, not sprouted
Soil Dried out, Soil too Wet, Soil not Viable
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Seed Not Sprouted
Ammonia Injury, Seed not Viable, Fertilizer in Contact w/Seed, Insect or Disease, Lack of Oxygen (Flooding)
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No Seed Planted
Planter Problems, Clogged Seed Delivery System, Planter Unit Drive Problems
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