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Emergence to Knee-High (V7) April and Katelin (Yellow…
Emergence to Knee-High (V7) April and Katelin
Scattered spots of dead or poorly growing plants
Uneven growth
Poor Growing Conditions
Uneven Drainage
Ammonia Injury
Dead or stunted, discolored plants grading into normal plants at margin or affected areas
Plants Discolored
Pale Green Color
Glyphosate drift injury
Waterlogged soils
Leaf edges yellow or dead
Potassium deficiency
Lower leaves dead, tips dying on upper leaves
Chinch bug
Fertilizer Injury
Leaves purplish or reddish, especially at tips
Wind Damage
Cold Soils
Glyphosate drift injury
Root Insects
Garden Symphylan
Wireworm
White Grub
Nemaodes
Grape Colaspis
Phosphorus Defciency
Plants irregularly shaped, broken, or wilted
Leaves rolled, plants wilted
Mechanical injury to root
Root feeding insects
Grape colapsis
White grub
Corn root aphid
Garden symphylan
Corn rootworm
Drought stress
Nematodes
Leaves tightly rolled, not wilted
Herbicide injury
2, 4-D, dicamba
Chloroacetamide herbicide
Leaves appear water-soaked, to grayish becoming necrotic
Frost
Paraquat injury
Ammonia injury
Plants suddenly wilt and die, cut off at ground level
Insect damage
Wireworm
Black cutworm
Cultivator injury
Plants twisted or broken off
High acetamide herbicide rates : Very rare in good soil conditions. High herbicide concentration in the germination zone, cold soil temps, and water saturated soils can cause injury
Cultivator damage
Thiocarbamate herbicide injury
Insecticide injury
Small area of dead plants
Dead plants present
Lightning
Cultivator injury
Plants missing
Problem at or near planting
Plant tissue removed
Windowpane effect, leaf skeletonizing
Insect damage
Grape colaspis
Redheaded flea beetle
Cereal leaf beetle
Palestriped flea beetle
Southern Corn Rootworm adult
Yellow-white areas in leaf
Necrotic stripes between veins
Stewart's leaf blight
Whitish stripes along veins
Sulfur deficency
Only on occasional plants
Physiological injury
Broad white areas, in center towards base of leaves, stunting, failure of internodes to elongate
Zinc Deficiency
Whitish or yellowing striping between leaf veins
Nutrient deficency
Magnesium
Boron
Manganese
Low pH
Iron
Narrow whitish scratches in leaf surface only
Corn Leaf Beetle
Plant mostly white
Genetic mutation
Isoxaflutole, mesotrione, clomazone drift or carryover
leaves appear sandblasted or speckled, tips shredded
Thrips
Wind Damage
Plants discolored and stunted
Leaves yellow; plants weak and stunted
Nitrogen, sulfur deficiency
Purple or red discoloration of leaves, especially margins; stunting of roots
Imidazolinone or sulfonylurea herbicide injury
Dinitroaniline herbicide injury
Dicamba herbicide injury
Phosphorus deficiency
Dull grey areas upper leaves, often where leaf bends
Frost or intense sunlight (scalding)
Plant tissue removed
Leaf margins damaged
Armyworm
Fall armyworm
Yellow-striped armyworm
Rows of holes across leaves
Cutworm
Armyworm
Wireworm
Billbug
Large holes in leaves
Slugs
Common stalk borer
Sod webworm
Variegated cutworm
Shredding or tearing of leaves
Wind, hail damage
