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Knee high (V7) to Tasseling )VT) (Leaves eaten (Stalk borer, European corn…
Knee high (V7) to Tasseling )VT)
Galls, silvery white then black
Smut
Plants lean or fall over
2,4-D Herbicide injury
Mechanical injury
Nematodes
Strong winds before brace roots have formed
Rootworm
Stalks collapse from stem rot
Pythium stalk rot
Bacterial stalk rot
Yellowing of leaf margins, beginning at tips, affected tissue later turns brown and dies
Potassium deficiency
White strips and some white leaves on scattered plants only
Genetic stripe
Narrow leaves, stripping
Sorghum downy mildew
Brace roots malformed or missing
2,4-D, dicamba
Slugs
Stalks collapse from rot
2,4-D Herbicide injury
Cutwrom
European corn borer
Yellowing of plants, beginning with lower leaves at the leaf tip along the midrib
Nitrogen deficiency
Standing water
Stunting, red leaves, excessive silvering
Maize dwarf mosaic and corn stunt
Stunting, tillering, twisting
Crazy top
Leaves completely white, or top leaves have scattered white
Extreme heat
Lesions or necrotic spots on leaves
Anthracose
Stewart's leaf blight
Yellow leaf blight
Helminthosporium leaf blights
Paraquat, atrazine+oil, or other photosynthetic inhibitor herbicides
Leaves shredded
Hail injury
Wind damage
Leaves eaten
Stalk borer
European corn borer
Variegated cutworm
Southwestern corn borer
Armyworm
Grasshopper
Cutworm
Livestock or wildlife
Yellowing and necrosis of lower leaves beginning at leaf tip
Herbicide injury
Photosynthetic inhibiting herbicide
Purpling or reddening of leaves, from tip backwards, affects lower leaves initialy, leaf tips may later turn dark brown and die
phosphorus deficiency
Pale green to white striping on leaves
Iron deficiency
Upper leaves brown and sticky
Corn leaf aphis
Leaves skeletonized or window-like
Western corn rootworm adult
Interveinal chlorosis or purpling
Amino acid synthesis inhibitor herbicide
Upper leaves show pale green to yellow interveinal discoloration
Manganese deficiency
Leaves have a window effect but neither surface is broken
Leafhopper eggs
Corn blotch leaf miner
Yellow to white interveinal striping on leaves or reddening of leaves
Magnesium deficiency
Yellow or dead leaves, or plants
Ammonia burn
Glyphosphate herbicide injury